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System Design Description of Forced-Convection Molten-Salt Corrosion Loops MSR-FCL-3 and MSR-FCL-4 W. R. Huntley M. D. Silverman

Printed in the United States of America. Available from National Technical Information Service U.S. Department of Commerce 5285 Port Royal Road, Springfield, Virginia 22161 Price: Printed Copy $5.50; Microfiche $2.25

This report was prepared as an amount of work sponsored by the United States Government. Neither the United States nor the Energy Research and Development Administration/United States Nuclear Regulatory Commission, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that i t s use would not infringe privately owned rights.

ORNL/TM-5540 Dist. Category UC-76

Contract No. W-7504-eng-26

Engineering Technology Division

SYSTEM DESIGN DESCRIPTION OF FORCED-CONVECTION MOLTEN-SALT CORROSION LOOPS MSR-FCL-3 AND MSR-FCL-4

W. R. Huntley M. D. Silverman

Date Published: November 1976

. 811

Prepared by the OAK RIDGE NATIONAL LABORATORY Oak Ridge, Tennessee 37830 operated by UNION CARBIDE CORPORATION for the ENERGY RESEARCH AND DEVELOPMENT ADMINISTRATION

WSTR~BUTIONOF THIS DOCUMENTISUNLIMIT~

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CONTENTS

......................................................... ABSTRACT ........................................................ 1. INTRODUCTION ................................................ 2 . FUNCTIONS AND DESIGN REQUIREMENTS ........................... 2.1 Functional Requirements ................................ 2.2 Design Requirements .................................... 2.2.1 Structural requirements ........................ 2.2.2 Instrumentation and control requirements ....... 2.2.3 Quality assurance .............................. 2.2.4 Codes and standards -mechanical and electrical .................................... 3 . DESIGN DESCRIPTION .......................................... 3.1 Detailed Systems ....................................... 3.2 Component Design Description ........................... 3.2.1 Salt pump and lubrication system ............... 3.2.2 Auxiliary tank ................................. 3.2.3 Piping system .................................. 3.2.4 Corrosion specimens ............................ 3.2.5 Fill-and-drain tank ............................ 3.2.6 Salt coolers ................................... 3.2.7 Main heaters ................................... 3.2.8 Auxiliary heaters .............................. 3.2.9 Helium cover-gas system ........................ 3.3 Electrical Systems ..................................... 3 . 4 Instrumentation and Controls ........................... 3.4.1 Temperature measurement and control ............ 3.4.2 Pressure measurement and control ............... 3.4.3 Pump speed measurement and control ............. 3.4.4 Power measurements ............................. 3.4.5 Thermal conductivity measurement ............... 3.4.6 Digital data system (Dextir) ................... 3.4.7 Block diagram .................................. 3.4.8 Instrument application diagram ................. 3.4.9 Molten-salt level measurements ................. 3.4.10 Molten-salt flow measurement ................... 3.4.11 Control panels ................................. 4. SYSTEM LIMITATIONS. SET POINTS. AND PRECAUTIONS ............. 5 . OPERATION ................................................... 5.1 Initial Salt Filling of the Fill-and-Drain Tank ........ PREFACE

Page V

1 1 2 2 3 3 4 4

5 6 6

12 12 20 20 22 25 25 31 32 34 36 41

41 42 42 43 43 43 44 44 48 48 48 50 53 53

............................. ................. 6. MAINTENANCE ................................................. 6.1 Maintenance Philosophy ................................. 6.2 Normal Maintenance Requirements ........................ ACKNOWLEDGMENTS ................................................. REFERENCES ...................................................... APPENDIX A. ELECTRICAL DRAWING LIST (MSR-FCL-3) ................ APPENDIX B. INSTRUMENT DRAWING LIST (MSR-FCL-3) ................ APPENDIX C. MECHANICAL DRAWING LIST (MSR-FCL-3) ................ APPENDIX D. ALPHA PUMP DRAWING LIST (MSR-FCL-3 AND -4) ......... 5.2 5.3

Filling the Loop with Salt Bringing the Loop to Design Conditions

APPENDIX E.

INSTRUMENT LIST FOR FCL-3 OR -4

....................

APPENDIX F. WELDING OF 2% Ti-MODIFIED HASTELLOY N

..............

55 56 56 56 57 59 59 61 63

67 71 73 93

PREFACE This report presents the System Design Description of molten-salt corrosion loops MSR-FCL-3 and MSR-FCL-4, which are high-temperature test facilities designed to evaluate corrosion and mass transfer of modified Hastelloy N alloys for use in molten-salt breeder reactors. These loops were in the advanced stages of assembly when construction was halted due to termination of the Molten-Salt Breeder Reactor Program. The MSR-FCL-3 is essentially complete except for installation of piping system components, and the MSR-FCL-4 is about 60% complete. The design features are documented here for the benefit of those who may want to use the facilities for similar experimentation. The facilities are available for use on other programs as appropriate.

SYSTEM DESIGN DESCRIPTION OF FORCED-CONVECTION MOLTEN-SALT CORROSION LOOPS MSR-FCL-3 AND MSR-FCL-4 W. R. Huntley M. D. Silverman ABSTRACT Molten-salt corrosion loops MSR-FCL-3 and MSR-FCL-4 are high-temperature test f a c i l i t i e s designed t o evaluate corrosion and mass t r a n s f e r of modified Hastelloy N a l l o y s f o r f u t u r e use i n Molten-Salt Breeder Reactors. S a l t is c i r c u l a t e d by a cent r i f u g a l sump pump t o evaluate material compatibility with LiFBeF2-ThF4-UF4 f u e l s a l t a t v e l o c i t i e s up t o 6 m / s (20 fps) and a t s a l t temperatures from 566 t o 705OC (1050 t o 1300OF).

This r e p o r t p r e s e n t s t h e design d e s c r i p t i o n of t h e various components and systems t h a t make up each corrosion f a c i l i t y , such as t h e s a l t pump, corrosion specimens, s a l t piping, main h e a t e r s , s a l t coolers, salt-sampling equipment, and helium covergas system, etc. The electrical systems and instrumentation and c o n t r o l s are described, and operational procedures, system l i m i t a t i o n s , and maintenance philosophy are discussed. Key words: molten s a l t , t e s t f a c i l i t y , MSBR, corrosion, mass t r a n s f e r , systems design d e s c r i p t i o n , forced convection, LiF-BeF2-ThF4-UF4, f u e l s a l t , high temperature, c e n t r i f u g a l Pump

1. Molten-salt

INTRODUCTION

corrosion loops MSR-FCL-3

and -4 were planned as p a r t of

t h e e f f o r t t o develop a s u i t a b l e metal a l l o y f o r t h e piping and components of f u t u r e Molten-Salt Breeder Reactors (MSBRs).

The corrosion loop design

was based on t h e design of similar experiments that have been conducted a t

Oak Ridge National Laboratory (ORNL) 1-3 Construction of t h e loops w a s not completed due t o termination of t h e

MSBR program a t ORNL; however, t h e two i d e n t i c a l loops were i n advanced

states of assembly when work w a s h a l t e d , with FCL-3 about 90% complete and FCL-4 about 60% complete. This design r e p o r t has been prepared t o document design f e a t u r e s i n

case t h e f a c i l i t i e s are r e a c t i v a t e d f o r some similar use and a l s o t o

2 provide design information f o r anyone i n i t i a t i n g f u t u r e forced-convection corrosion s t u d i e s with molten salts.

Since corrosion loops FCL-3 and -4

w e r e i d e n t i c a l , much of t h e d e s c r i p t i v e material included i n t h i s r e p o r t r e f e r s t o only one loop, FCL-3,

t o avoid needless r e p e t i t i o n .

FUNCTIONS AND DESIGN REQUIREMENTS

2.1

Functional Requirements

Corrosion loops FCL-3 and -4 were designed as p a r t of t h e program t o develop a s t r u c t u r a l containment material f o r t h e primary c i r c u i t of MSBRs. The primary s a l t c i r c u i t of a molten-salt r e a c t o r contains f i s s i o n products, including tellurium, which have been shown t o cause i n t e r g r a n u l a r a t t a c k of standard Hastelloy N a l l o y .

These test f a c i l i t i e s are designed t o permit

evaluation of corrosion of modified H a s t e l l o y N a l l o y s with s a l t containing t e l l u r i u m a t t y p i c a l MSBR temperature g r a d i e n t s and s a l t v e l o c i t i e s .

The

equipment is designed f o r r e l i a b l e operation over periods of several years t o evaluate modified a l l o y s containing titanium and niobium a d d i t i o n s i n i t i a l l y and t o demonstrate adequate corrosion r e s i s t a n c e of reference a l l o y s for typical reactor lifetimes. The c a p a b i l i t y f o r frequent inspection of removable metal corrosion specimens i s provided by a unique system of s a l t f r e e z e valves coupled with v e r t i c a l l y o r i e n t e d specimen-removal s t a t i o n s a t t h r e e l o c a t i o n s i n t h e piping system.

Based on p a s t experience, w e a n t i c i p a t e specimen re-

moval a t 500-hr increments i n i t i a l l y and a t 1000-hr increments during prolonged test runs.

S a l t samples are taken from t h e loop about two t o four

t i m e s per month during r o u t i n e operation.

The sampling is done a t t h e aux-

i l i a r y pump tank, where s a l t samples are removed i n a s m a l l copper d i p samp l e r via b a l l valves on a vertical riser pipe. moved i n an a i r lock and analyzed elsewhere.

The s a l t samples are reOn-line s a l t chemistry

monitoring i s accomplished by i n s e r t i o n of an electrochemical probe through another riser on t h e a u x i l i a r y tank.

+ + ratio

t h e U 4 /U3

The electrochemical probe monitors

i n t h e s a l t and provides a n extremely s e n s i t i v e method

f o r d e t e c t i n g changes i n oxidation p o t e n t i a l of t h e salt. measuring t h i s r a t i o several t i m e s per week.

W e anticipate

The corrosion loops are designed f o r r e l i a b l e long-term s e r v i c e and f o r unattended operation on n i g h t s and weekends.

A diesel-driven motor-

generator (M-G) set provides emergency electrical power i n t h e event of z

normal power i n t e r r u p t i o n .

Automatic p r o t e c t i v e f e a t u r e s w i l l "scram" t h e

loop t o place i t i n a s a f e standby condition i f abnormal conditions occur. I n t h e event of an alarm a c t i o n during unattended operation, a n alarm is sounded a t t h e P l a n t S h i f t Supervisor (PSS) o f f i c e , which i s manned 24 h r / day.

I f t i m e permits, t h e PSS w i l l i n v e s t i g a t e t h e alarm a t t h e f a c i l i t y ;

but i n any case, a designated l i s t of people w i l l be telephoned u n t i l someone f a m i l i a r with the f a c i l i t y is a l e r t e d t h a t t r o u b l e has occurred. The s a l t piping system is b u i l t t o recognized standards of design,

materials, and construction, b u t a d d i t i o n a l s a f e t y is provided by a m e t a l s h i e l d enclosure t o l e s s e n operator hazard i n t h e event of p i p e r u p t u r e o r component f a i l u r e . The corrosion loops were placed i n Building 9201-3, Y-12 Area, because experimental space and u t i l i t y s e r v i c e s w e r e a v a i l a b l e there.

Equipment on

hand a t no c o s t t o t h i s p r o j e c t included a helium-purification system, emergency diesel-generator,

electrical power supplies, electric bus bars,

overhead crane, compressed a i r , etc. 'i

2.2 2.2.1

Design Requirements

S t r u c t u r a l requirements A l l p a r t s of t h e system t h a t are exposed t o high-velocity

made of 2% Ti-modified Hastelloy N.

Other p a r t s of t h e system t h a t are

exposed t o s a l t , such as t h e fill-and-drain Hastelloy N.

s a l t are

tank, are made of standard

Some pressure-containing p a r t s t h a t are not exposed t o flow-

i n g s a l t are made of stainless steel; t h e s e s t a i n l e s s steel p a r t s are used only a t s e a l i n g members, such as liquid-level-probe

p e n e t r a t i o n s and b a l l

valves, i n t h e inert-gas space above t h e s a l t l i q u i d level and are genera l l y a t t h e end of vertical pipe extensions where temperatures are rela1

t i v e l y low. Pressures i n the system range up t o a maximum of 2.0 MPa (290 p s i a )

a t t h e pump discharge.

The pressure drops s l i g h t l y t o 1.9 MPa (270 p s i a )

a t t h e p o i n t of e n t r y i n t o h e a t e r 1, where t h e design m e t a l temperature is 670'C

(1240'F).

The maximum temperature t o which pressure-containing metal i n t h e system is exposed i s 793'C

(1450'F)

a t t h e o u t l e t of h e a t e r 2, where t h e

pressure i s 1.3 MPa (185 p s i a ) . 2.2.2

Instrumentation and c o n t r o l requirements The instrumentation and c o n t r o l systems i n s t a l l e d i n t h e FCL-3 and

-4 f a c i l i t i e s are designed t o maintain a l l system parameters w i t h i n s a f e and acceptable ranges during both attended and unattended operation and t o place t h e f a c i l i t y i n a standby condition i n t h e event of c e r t a i n abnormal conditions, such as l o s s of e l e c t r i c a l power, low helium system

tem-

pressure, low pump coolant-oil flow, low pump speed, high main-heater

perature, l o w cooler temperature, o r high temperature on t h e f r e e z e valves of t h e specimen-removal s t a t i o n s . I n a d d i t i o n t o t h e automatic s a f e t y a c t i o n s , a number of a d d i t i o n a l

alarm c i r c u i t s are provided t o a l e r t t h e operator during attended operation ( o r t h e PSS during unattended operation) when c e r t a i n parameters are outs i d e prescribed l i m i t s .

The alarms are both audible and v i s u a l .

Key parameters are measured and recorded e i t h e r on s t r i p - c h a r t analog recorders o r on a d i g i t a l data-acquisition system (Dextir).

L e s s important

parameters are measured and indicated on appropriate instruments from which they may be logged by t h e operator as required. S u f f i c i e n t documentation is provided by drawings, c a l i b r a t i o n s h e e t s , operating i n s t r u c t i o n s , etc., t o i n s u r e t h a t t h e d a t a are s u f f i c i e n t i n both scope and q u a l i t y t o accomplish t h e o b j e c t i v e of t h e experiment. 2.2.3

Q u a l i t y assurance Design, f a b r i c a t i o n , inspection, and t e s t i n g of t h e molten-salt

sys-

t e m are performed i n accordance with Quality Level I11 requirements, as defined i n ORNL Quality Assurance Procedure QA-L-1-102,

"Guide f o r t h e

Selection of Quality Levels," and t h e requirements of Reactor Division Engineering Document No. Q-11628-RB-001-S-0,

"Quality Assurance Program

Index f o r Molten-Salt Corrosion Loop MSR-FCL-3."

5 The loop drawings s p e c i f y standard Hastelloy N tubing, bar, etc.,

be manufactured i n accordance with Reactor Development Technology (RDT) standards of t h e Energy Research and Development Administration.

However,

such material w a s not a v a i l a b l e due t o t h e l i m i t e d q u a n t i t i e s of Hastelloy

N used a t ORNL, and i t w a s necessary t o s u b s t i t u t e material conforming t o i n t e r n a l ORNJi material standards.

The ORNL material standards s a t i s f y t h e

s i g n i f i c a n t q u a l i t y provisions of t h e RDT standards.

RDT standards were n o t s p e c i f i e d on t h e drawings f o r t h e 2% T i modified Hastelloy N a l l o y shapes, because t h i s w a s a new a l l o y t h a t w a s being procured i n small l o t s and procurement t o RDT standards w a s n o t prac-

tical.

Therefore, t h e 2% Ti-modified Hastelloy N p l a t e , b a r , and tubing

were purchased t o a p p l i c a b l e ASTM standards f o r standard Hastelloy N. Welding procedures f o r 2% Ti-modified Hastelloy were not s p e c i f i e d on t h e drawings because such procedures were n o t known a t t h e t i m e t h e drawings were issued.

However, procedures w e r e later developed (see Appen-

d i x F), and i t w a s found t h a t e x i s t i n g procedures f o r welding standard Hastelloy N were a p p l i c a b l e t o 2% Ti-modified Hastelloy N.

Therefore,

welds involving t h e modified a l l o y were done according t o ORNL weld specif i c a t i o n s WPS-1402 and WPS-2604. 4

2.2.4

Codes and standards Mechanical.

- mechanical

and electrical

Pressure v e s s e l s i n t h e system are designed according t o

t h e r u l e s of t h e ASME Boiler and Pressure Code, Section VIII, Division 1, 1974, "Pressure Vessels," and addenda thereto.

Piping is designed i n

accordance with rules of ANSI Standard B31.1-1973,

"Power Piping," and

addenda thereto. P r i o r t o 1974, design and construction of Hastelloy N vessels, per Section VI11 of t h e Code, were performed under the provisions of Code Case

1315.

During 1974 t h i s case w a s annulled, and t h e s e provisions were in-

cluded i n t h e b a s i c code i n t h e form of addenda t o t h e Code.

Allowable

stresses f o r Hastelloy, r e f e r r e d t o i n t h e Code as a l l o y "N" with a nominal

composition of Ni-Mo-Cr-Fe,

are now given i n t h e Code without change from

their previous values i n Case 1315. Electrical.

The electrical materials, workmanship, and completed

i n s t a l l a t i o n comply with t h e following codes and standards:

National

E l e c t r i c Code, National Electric Manufacturers Association, American National Standards I n s t i t u t e , I n s t i t u t e of Electrical and E l e c t r o n i c Engineers, and Underwriters' Laboratories, Inc. Also s p e c i f i c d e t a i l s f o r t h e i n s t a l l a t i o n of t h e h e a t e r elements are given i n an i n t e r n a l Union Carbide Corporation Engineering Standard ES2.1-1, "Installation Specification

- Ceramic

and Tubular-Type Heaters," and i n t e r -

n a l Checkout Procedure QA-10596-RB-008-S-0. 3. 3.1

DESIGN DESCRIPTION Detailed Systems

The physical arrangement of mechanical components and piping i s shown i n t h e s i m p l i f i e d drawing of Fig. 1, and t h e test f a c i l i t y is shown schem a t i c a l l y i n Fig. 2. A c e n t r i f u g a l sump pump is located a t t h e high p o i n t

of t h e f a c i l i t y .

Liquid s a l t volume changes due t o temperature cycling are

accommodated w i t h i n t h e a u x i l i a r y pump tank and pump bowl.

The s a l t is

discharged from t h e pump a t a flow rate of ~2.5 X

m 3 / s (4 gpm) and

flows through a piping system f a b r i c a t e d of 12.7-mm-OD

X 1.07-mm-wall

(l/Z-in.-OD

X 0.042-in.-wall)

tubing.

The pump discharges i n t o r e s i s t a n c e

h e a t e r 1, where t h e s a l t temperature i s increased from 566 t o 635OC.

The

s a l t then flows p a s t t h e corrosion specimens of m e t a l l u r g i c a l s t a t i o n 2 (MET 2) and is heated f u r t h e r t o 705OC as i t passes through r e s i s t a n c e heated s e c t i o n 2.

The s a l t passes v e r t i c a l l y through corrosion s t a t i o n

MET 3 and e n t e r s t h e two air-cooled finned h e a t exchangers, where t h e s a l t

temperature is reduced t o 566째C before i t flows p a s t t h e corrosion specimens a t s t a t i o n MET 1. This arrangement allows m e t a l l u r g i c a l specimens t o be exposed t o s a l t a t t h e high, intermediate, and low bulk f l u i d s a l t temp e r a t u r e s of t h e loop.

The corrosion specimens are mounted on holders t h a t

can be removed v e r t i c a l l y f o r frequent examination via s a l t f r e e z e valves and b a l l valves, as described i n d e t a i l elsewhere.

The corrosion s t a t i o n s

are designed so t h a t specimens may be removed without d r a i n i n g t h e molten s a l t from t h e f a c i l i t y .

Therefore, t h e specimen s t a t i o n s are v e r t i c a l l y

o r i e n t e d and t h e f r e e z e valves are located a t t h e same vertical e l e v a t i o n

as t h e f r e e l i q u i d s u r f a c e i n t h e pump and pump a u x i l i a r y tank.

This

7 ORNL-DWG m-5632~2

FREEZE VALVE (TYPICAL) \

-v-

-fin

CORROSION SPECIMENS (MET N 0 .AIR 2 ) ~ HEATER LUGS (TYPICAL)

ALPHA SALT PUMP RESISTANCE HEATED SECTION NO. 2 %-in O D r O 0 4 2 - i n WALL HASTELLOY N

COOLER NO.(

FLOW RATE = 4 gpm VELOCITY -10 f p s IN %-in TUBING REYNOLDS NO = 6600 TO 1 4 . m

?@COOLER NO2

FREEZE VALVES

L AND DRAIN TANK

Fig. 1. Isometric drawing of Molten-Salt Forced Convection Corros i o n Loop MSR-FCL-3 ( 1 i n . = 25.4 mm; 1 gpm = 3.785 l i t e r s / m i n ; 1 f p s = 0.305 m/s).

configuration results i n a piping system with t h r e e low p o i n t s , and a corresponding number of fill-and-drain used i n t h e fill-and-drain

l i n e s are required.

Freeze valves are

l i n e s , s i n c e they provide dependable zero-

leakage shutoff a t reasonable cost.

The fill-and-drain

l i n e s are f a b r i -

cated of standard Hastelloy N tubing of 9.5 mm OD X 0.9 mm w a l l (318'

in.

OD X 0.035 in. w a l l ) and a t t a c h t o a common d i p tube i n t h e fill-and-drain

tank.

The fill-and-drain

tank i s l o c a t e d a t the lowest p o i n t of t h e sys-

t e m t o allow g r a v i t y drainage. Corrosion loops FCL-3 and -4 are designed t o operate with t h e MSBR reference f u e l s a l t mixture LiF-BeF2-ThFk-UF4

(72-16-11.7-0.3

mole

W).

8 ORNL- DWG 10- 5630R3 SALT SAMPLE

HEATER LUGS

566OC ( iO5O0F1

FREEZE VALVE METALLURGICAL SPECIMEN NO. 2

635OC (4175OF)

ALPHA SALT

L /SPEC 566'C

FREEZE VALVE

METALLURGICAL MEN NO. 4

'/2

in. ODx 0.042-in.-

WALL HASTELLOY N TUBE-

METALLURGICAL SPECIMEN NO. 3

COOLER NO.1

Fig. 2. Simplified schematic drawing of Molten-Salt Corrosion Loop MSR-FCL-3 (1 i n . = 25.4 mm; 1 gpm = 3.785 l i t e r s / m i n ; 1 f p s = 0.305 m / s ) .

The thermophysical propertiess7

of t h e s a l t mixture are shown i n Table 1.

The s a l t i s q u i t e viscous and dense; f o r example, a t t h e minimum loop temp e r a t u r e of 566OC t h e v i s c o s i t y is 0.0144 P a * s (35 l b f t - l hr-l) density is 3.3 g/cm3 (207 l b / f t 3 ) .

rate of 2.5 X MPa (270 p s i ) .

and t h e

A t design- temperature and design flow

m 3 / s (4 gpm), t h e c a l c u l a t e d loop pressure drop i s 1.9 This pressure l o s s can be matched by operating t h e ALPHA

c e n t r i f u g a l s a l t pump a t about 5000 rpm. A temperature p r o f i l e of t h e loop w a s c a l c u l a t e d and i s shown graphi-

c a l l y i n Fig. 3.

The symbols a t t h e top of t h e f i g u r e i n d i c a t e t h e compo-

nents through which t h e s a l t flows, - s t a r t i n g a t t h e pump, passing through h e a t e r s 1 and 2, c o o l e r s 1 and 2, and r e t u r n i n g t o t h e pump suction.

The

s o l i d heavy l i n e r e p r e s e n t s t h e bulk f l u i d temperature as i t ranges over t h e MSBR reference design conditions of 566 t o 705OC.

The inner w a l l tem-

peratures, shown by t h e f i n e l y dashed l i n e , vary g r e a t l y from t h e bulk s a l t

Table 1. Themphysical property data for molten-salt mixture LiF-BeF2-ThF4-UF4 (72-16-11.7-0.3 mole X) Parameter

Uncertainty (X)

Value

Ref.

viscosity, p lb ft-l hr-l Pa. s Therm+

0.264 exp (7370/T) (OR) 1.09 x exp (4090/T) (K)

10 10

0.71 1.23

15 15

7 7

1 1

6 6

0.324 1357

4 4

5 5

932 500

5OC 5OC

5 5

conductivity,a k

Btu''rh l ' t f m-1 ( ~ 1 - 1

("F)'1

Density, p lb/ft3 g/cm3

228.7 3.665

- 0.0205T (OF)

- 5.91

T ("C)

Specific heat, Cp Btu lb-l J l'gk (K)-l Liquidus temperature OF OC

aEstimated from values given in Ref. 7 for analogous salts.

10 ORNL-DWG 76-16633

RETURN TO PUMP

TEMPERATURE TEMPERATURE

LENGTH (ft)

Fig. 3. Temperature p r o f i l e of Molten-Salt Forced Convection Corros i o n Loop, MSR-FCL-3, a t design operating conditions (1 f t = 0.305 m).

temperature due t o t h e l a r g e temperature drop a c r o s s t h e f l u i d f i l m a t t h e pipe surface.

The f i l m drop and AT across t h e Ti-modified Hastelloy N tube

w a l l r e s u l t i n o u t e r w a l l temperatures ranging from 793OC a t t h e o u t l e t of h e a t e r 2 t o 504OC a t t h e o u t l e t of cooler 2.

The amount of a i r cooling a t

cooler 2 is i n t e n t i o n a l l y less than that a t cooler 1 so as t o keep t h e i n n e r w a l l temperature of cooler 2 j u s t above t h e s a l t l i q u i d u s temperature. At design conditions, t h e inner w a l l temperature a t t h i s p o i n t is 52loC,

which is about 21OC above t h e l i q u i d u s temperature of t h e s a l t .

Table 2

is a summary of engineering design d a t a f o r FCL-3 and -4. The general s t a t u s of loop construction a t t h e t i m e t h e p r o j e c t w a s h a l t e d is indicated i n Fig. 4, a n overhead photograph of t h e test area. FCL-3 and -4 were 90 and 60% completed, respectively, and were being b u i l t adjacent t o t h e earlier corrosion loop FCL-2.

The new c o n t r o l panels and

overhead cable t r a y s are r e a d i l y v i s i b l e i n t h e photograph.

12 , Table 2.

Engineering design d a t a f o r loops FCL-3 and -4

Materials, temperatures, v e l o c i t i e s , volumes, etc. Tubing and corrosion specimens Nominal tubing s i z e Approximate tubing l e n g t h Bulk f l u i d temperatures Bulk f l u i d AT F l u i d v e l o c i t y p a s t corrosion specimens Flow rate System AP a t 4 gpm S a l t volume i n loop Surface-to-volume r a t i o Pump speed Type of s a l t

2% Ti-modified Hastelloy N 19.7 mm OD x 1.1 mm wall (0.5 X 0.042 in.) 27 m (90 f t ) 566-705OC (1050-l30O0F) 139OC (250OF) 3 t o 6 m / s (10 t o 20 f p s ) 2.5 x l W 4 m 3 / s (4 gpm) 1.9 MPa (270 p s i ) 4920 cm3 (300 in.3) 3.2 cm2/cm3 (8.1 in.2/in.3) 5000 rpm LiF-BeF2-ThF4-UFs (72-16-11.7-0.3 mole X ) Cooler d a t a

Material

Number of c o o l e r Finned l e n g t h o f Finned length of Coolant a i r flow

sections cooler 1 cooler 2 per cooler

Cooling load, cooler 1

Cooling load, c o o l e r 2 Total h e a t removal from both c o o l e r s Cooler 1 h e a t f l u x a t tube I D Cooler 2 h e a t f l u x a t tube I D I n s i d e w a l l temperature a t o u t l e t , c o o l e r 2

12.7-mm-OD x 1.1-m-wall (0.5- x 0.42-in.) 2% Ti-modified H a s t e l l o y N w i t h 1.6-mm-thick (1/16-in.) n i c k e l f i n s 2 5.7 m (18.8 f t ) 5.5 m (17.9 f t ) a . 9 m 3 / s (%2000 cfm) 100 kW (342,000 Btu/hr) 58 kW (200,000 Btu/hr) 158 kW (540,000 Btu/hr) ft-2) 0.53 W/m2 (167,000 Btu hr'' 0.3 MW/m2 (96,000 Btu hr-l f r 2 ) 521OC (970OF)

Heater d a t a

Material Heater s i z e Current t o c e n t e r l u g s on h e a t e r Number o f heated s e c t i o n s Length o f each h e a t e r Heat i n p u t each h e a t e r To tal I n s i d e w a l l temperature a t o u t l e t h e a t e r 2 Outside w a l l temperature a t o u t l e t h e a t e r 2 (maximum p i p e w a l l temperature) Heat f l u x S a l t Reynolds number i n piping

3.2 3.2.1

2% Ti-modified Hastelloy N 12.7 nnn OD x 1.1 mm w a l l ( 0 . 5 1700 A 2 3.7 m (12 f t ) 79 kW (270,000 Btulhr) 158 kW (540,000 Btu/hr) 777OC (1430OF) 793OC (1460OF) 0.65 W/m2 (205,000 Btu hr-l 6600 t o 14,000

0.042 i n . ) t

fC2)

Component Design Descriptions

Salt pump and lubrication system The ALPHA pump, shown in Fig. 5, is a centrifugal sump pump designed

at ORNL for molten-salt or liquid-metal service.

The impeller, shaft, and

lower liquid-wetted portions of the pump are fabricated of 2% Ti-modified Hastelloy N alloy, and the bearing housing is fabricated of stainless steel. L

ORNL-DWG 69-8964R

ELECTRIC LEVEL PROBE

/ UPPER SEAL

Fig. 5.

Cross section view of ALPHA pump (1 in.

LLLLLAJ INCHES

25.4 mm).

14 The pump is designed t o o p e r a t e a t speeds up t o 6000 rpm t o provide flows t o 1.9 X

m 3 / s (30 gpm) a t temperatures t o 760OC.

However, i n t h i s

corrosion loop a p p l i c a t i o n t h e pump w i l l normally o p e r a t e a t about 5000 rpm

m 3 / s (4 gpm) a t 566OC and a head of 58 m

and a flow rate of 2.5 X (191 f t ) .

Pump drawings are l i s t e d i n Appendix D.

The pump performance d a t a with w a t e r , shown i n Fig. 6, shows t h a t t h e

pump w i l l be o p e r a t i n g f a r below i t s design flow rate.

ORNL-DWG

A t low flow rates

73-4163R

1 0.045-in. CLEARANCE AT TOP AND BOTTOM OF

IMPELLER

-0

16 20 FLOW (gprn)

Fig. 6. ALPHA pump performance i n water ( 1 f t = 0.305 m; 1 gpm = 3.785 l i t e r s / m i n )

t h e e f f i c i e n c y of t h e ALPHA pump i s a l s o low; however, comprehensive e f f i ciency d a t a are not a v a i l a b l e over t h e range of flow rates and speeds shown i n Fig. 6.

One s p e c i f i c e f f i c i e n c y d a t a p o i n t w a s obtained during operation

of a preceding corrosion loop i n which sodium fluoroborate s a l t w a s pumped

a t 4800 rpm, a t a temperature of 455OC, and a t a flow rate of 2.5 X m 3 / s ( 4 gpm), and t h e e f f i c i e n c y w a s found t o be only 8.3%.

loW4

Therefore, t h e

pump e f f i c i e n c y i s expected t o be about 8% a t design conditions i n corrosion loops FCL-3 and -4.

Pump e f f i c i e n c i e s approaching 50% would be expected f o r

s a l t flow rates near t h e pump design rate of 1.9 X

m 3 / s (30 gpm).

The ALPHA pump is driven by a 15-kW (20-hp) variable-speed motor which i n t u r n is supplied by a variable-frequency,

variable-voltage M-G set.

The

motors are much l a r g e r than required f o r t h i s p a r t i c u l a r a p p l i c a t i o n b u t

were purchased i n t h i s s i z e i n case the ALPHA pumps are used i n f u t u r e app l i c a t i o n s t h a t demand more pumping power.

The motor and generator are

described i n Section 3 . 4 , E l e c t r i c a l Systems.

The d r i v e motor is supported

over t h e ALPHA pump by a s p e c i a l alignment spool piece, and t h e motor is d i r e c t l y connected t o t h e pump s h a f t by a f l e x i b l e coupling (Thomas Catalog

No. 861, type DBZ-A,

s i z e 101).

has been driven by V-belts,

I n previous a p p l i c a t i o n s , t h e ALPHA pump

b u t t h i s has proved u n r e l i a b l e a t speeds above

4000 rpm, p a r t i c u l a r l y with t h e r e l a t i v e l y dense f u e l s a l t mixture, due t o upper s h a f t f l e x i n g and v i b r a t i o n s from t h e b e l t torque.

Therefore, t h e

d i r e c t d r i v e w a s s e l e c t e d f o r corrosion loops FCL-3 and - 4 , even though i t

is more c o s t l y because i t involves a high-speed motor design and an M-G set f o r each corrosion loop.

The M-G sets were a v a i l a b l e from o t h e r f a c i l i t i e s

a t no cost. A n a u x i l i a r y tank, mounted adjacent t o and on t h e same level as t h e

pump bowl, provides t h e necessary space t o accommodate thermally created volume changes i n l i q u i d inventories.

The a u x i l i a r y tank a l s o provides

space t o mount l i q u i d - l e v e l i n d i c a t o r s and liquid-sampling equipment and

may be e a s i l y replaced t o accommodate t h e requirements of a p a r t i c u l a r experiment. Interconnecting piping between t h e a u x i l i a r y tank, pump bowl, and pump i n l e t permits l i q u i d flow from t h e s h a f t l a b y r i n t h above t h e impel-

ler t o t h e a u x i l i a r y tank and then t o t h e pump i n l e t .

The l i q u i d flow rate

through t h e a u x i l i a r y tank ( s h a f t l a b y r i n t h leakage) varies with pump speed and flow as shown i n Fig. 7.

A t t h e required loop design condition of 5000

ORNL- DWG 73- 4164

i 2 3 4

0.045-in. CLEARANCE AT TOP AND BOTTOM OF IMPELLER 4 . 4 p s i COVER GAS PRESSURE WATER TEMPERATUREz68 O F 0,622-in. I D AT INLET NOZZLE

Fig. 7. ALPHA pump main loop flow vs a u x i l i a r y tank flow ( 1 gpm = 3.785 l i t e r s / m i n )

rpm and flow rate of 2.5 X

m3/s (4 gpm), t h e a u x i l i a r y tank flow rate

w i l l be approximately 20 c m 3 / s (0.34 gpm)

The pump has an overhung vertical s h a f t with two o i l - l u b r i c a t e d b a l l bearings and two o i l - l u b r i c a t e d mechanical f a c e seals l o c a t e d above t h e process l i q u i d surface.

O i l e n t e r s a t t h e top of t h e pump t o l u b r i c a t e

t h e bearings and seals and a l s o t o provide s h a f t cooling.

A second oil

stream enters t h e pump f l a n g e t o provide cooling and acts as a p r o t e c t i v e h e a t dam between t h e bearings and seals and t h e elevated-temperature pro-

cess f l u i d .

An inert-gas purge flow of 80 cm3/min introduced a t t h e "gas

i n l e t " is d i r e c t e d t o t h e s h a f t annulus, flows upward t o e x i t through t h e

seal leakage l i n e , and carries leakage from t h e lower oil seal overboard. Although t h e pump is designed f o r a s p l i t purge gas flow a t t h e s h a f t annulus, t h e downward flow p o r t i o n of t h e s p l i t gas purge is n o t needed when handling l i q u i d s , such as molten s a l t , which have low vapor pressures.

A s e p a r a t e o i l system is provided t o supply l u b r i c a t i o n and coolant o i l t o t h e ALPHA pump. The system uses a l i g h t t u r b i n e o i l , Gulfspin 35, which is a p a r a f f i n i c s t r a i g h t mineral o i l with a f l a s h p o i n t of 161째C and

a f i r e p o i n t of 175OC.

The o i l v i s c o s i t y ranges from 66 Saybolt seconds

a t 38OC t o 36 Saybolt seconds a t 100째C, t h e h e a t capacity i s 1.9 W/kg.K, and t h e s p e c i f i c g r a v i t y is 0.85.

The o i l system i s cooled by a water-

cooled h e a t exchanger located i n t h e o i l r e s e r v o i r , as shown i n the i n s t r u ment a p p l i c a t i o n diagrams, Figs. 20 and 21, i n Section 3.4.8. provided by a 90-W (1/8-hp)

c e n t r i f u g a l pump which discharges o i l a t a

pressure of 220 kPa (17 psig). ensure i t s cleanliness.

O i l flow is

The o i l f l o w is continuously f i l t e r e d t o

A flow switch, FS-OOSA,

i s used t o automatically

s t a r t t h e s p a r e o i l pump i n case of l o s s of flow.

I n t h e event of l o s s of

normal power, both o i l pumps are automatically switched t o t h e emergency generator power supply t o ensure t h a t coolant o i l flow is maintained while t h e pump bowl i s a t elevated temperature.

The t o t a l o i l flow from one op-

e r a t i n g o i l pump is t h r o t t l e d t o 2.3 l i t e r s / m i n such t h a t t h e bearings and o i l seals receive 0.6 l i t e r / m i n of "lube o i l " and t h e remainder flows i n p a r a l l e l through "coolant o i l " passages w i t h i n t h e pump

A t h r o t t l e valve (HV-008) i s i n s t a l l e d i n t h e l u b r i c a t i o n r e t u r n l i n e

t o create o i l back pressure a t t h e lower o i l seal.

This f e a t u r e is pro-

vided t o ensure t h a t t h e o i l pressure o u t s i d e t h e seal is equal to, o r g r e a t e r than, t h e helium pressure within t h e seal and thereby maintain l u b r i c a t i o n of t h e lapped seal surfaces.

A pressure switch (PS-008) and

a n alarm are provided t o alert t h e operators i f t h e o i l back pressure drops below t h e normal operating pressure of helium w i t h i n t h e lower seal assembly and pump bowl. The ALPHA pump has been s u c c e s s f u l l y operated i n two previous hightemperature molten-salt a p p l i c a t i o n s .

a t 4800 rpm, pumping 2.5 X

The pump has operated f o r 6800 h r

m 3 / s (4 gpm) of sodium fluoroborate s a l t

(NaBF4-NaF, 92-8 mole %) a t a temperature of 455OC.

A p o s t t e s t inspection

showed t h a t t h e bearings and seals were i n e x c e l l e n t condition.

has accumulated an a d d i t i o n a l 12,000 h r a t 4000 rpm, pumping 2 X (3.1 gpm) of f u e l s a l t mixture (LiF-BeFz-ThF4-UF4) from 566 t o 727OC. .-

The pump

m3/s

a t temperatures ranging

These previous pump a p p l i c a t i o n s imply t h a t r e l i a b l e

pump operation can be expected i n corrosion loops FCL-3 and -4.

A summary

of expected operating conditions f o r t h e ALPHA pump i n FCL-3 and -4 i s shown i n Table 3.

tri

18 Table 3.

Expected operating conditionsa f o r ALPHA pump i n FCL-3 and -4

Type of s a l t being pumped

LiF-BeF2-ThF4-UF4 (72-16-11.7-0.3 mole %)

S a l t temperature

566°C (1050°F)

S a l t d e n s i t y a t 566OC

3.33 g/cm3 (206 l b / f t 3 )

Pump speed

5000 rpm

S a l t flow rate

2.5

Pump head

58.2 m (191 f t )

Auxiliary tank flow rate

2 1 c m 3 / s (0.34 gpm)

pump e f f i c i e n c y b

~ 8 %

Cover gas p r e s s u r e

143 kPa ( 6 psig)

Type of cover gas

Helium

Lubrication o i l flow rate

0.6 l i t e r / m i n

Lubrication o i l p r e s s u r e a t bearing housing exit

157 kPa ( 8 psig)

Coolant o i l flow rate

1.7 l i t e r s / m i n

H e l i u m flow rate through lower o i l seal catch b a s i n

80 cc/min

H e l i u m flow rate downward i n t h e s h a f t annulus

None

Typical lower o i l seal leakage

2 t o 25 cc/day

Typical upper o i l seal leakage

2 t o 25 cc/day

I n l e t temperature of l u b r i c a t i o n o i l

32°C (90°F)

O u t l e t temperature of l u b r i c a t i o n o i l

42°C (108°F)

I n l e t temperature of coolant o i l

32°C (90°F)

E x i t temperature of coolant o i l

35°C (95'F)

m 3 / s ( 4 gpm)

a Based on actual ALPHA pump operation a t 566OC i n corrosion loop MSR-FCL-2b. bThe pump e f f i c i e n c y i s very low i n t h i s a p p l i c a t i o n because t h e pump o p e r a t e s f a r from i t s design point.

19 P a r t s were f a b r i c a t e d t o prov-le Amrcomplete ALPHA pump r o t a r y assemblies f o r t h e corrosion loop program. a u x i l i a r y tanks were f a b r i c a t e d .

Also, two pump bowls and two

Figure 8 shows an exploded v i e w of a l l

t h e p a r t s of t h e r o t a r y assembly p l u s t h e pump bowl.

The a u x i l i a r y tank

i s described i n more d e t a i l i n t h e next s e c t i o n of t h i s r e p o r t .

Fig. 8. pump tank.

Exploded view of t h e ALPHA s a l t pump r o t a r y assembly and

20 3.2.2

Auxiliary tank The a u x i l i a r y tank serves as an extension of t h e ALPHA pump bowl.

i s connected t o t h e pump bowl by c i r c u l a t i n g s a l t l i n e s and by a s i n g l e

vent connection i n t o t h e helium space above t h e gas-salt i n t e r f a c e . S i x nozzles p e n e t r a t e t h e top head of t h e a u x i l i a r y tank. these are of 19-mm-OD

(3/4-in.)

Three of

tubing f o r i n s e r t i o n of l i q u i d level probes.

The o t h e r t h r e e nozzles are 33-m-OD

(1-in.,

sched-40 IPS).

These l a t t e r

t h r e e p e n e t r a t i o n s are f o r s a l t sampling, chemical a d d i t i o n s , and e l e c t r o chemical probes.

The liquid-level-probe

compressed Teflon seals.

penetrations are provided with

The s a l t sampling, chemical addition, and e l e c t r o -

chemical probe p o r t s are s e a l e d by b a l l valves with Teflon seats. The i n s i d e dimensions of t h e tank are approximately 152 mm i n diameter (6 in.)

by 178 mm high (7 in.)

The lower portions of t h e tank, which are

exposed t o flowing salt, are made of 2% Ti-modified Hastelloy N.

Upper

p a r t s of t h e tank, which are above t h e s a l t level, are made of standard Hastelloy N, except f o r some s t a i n l e s s steel p a r t s t h a t are used a t t h e b a l l valves and level probe seals. The design pressure and temperature of t h e tank are 0.5 MPa (65 p s i a ) and 705째C (1300째F), except a t t h e Teflon seals, where t h e design temperature

is 204OC (400OF).

This lower temperature a t t h e seals is achieved by pro-

viding tubing and pipe extensions of s u f f i c i e n t length t o a s s u r e t h e proper temperature gradient.

I n normal operation, t h e a n t i c i p a t e d p r e s s u r e and

temperature w i l l be only 0.15 MPa (21 p s i a ) a t 566째C (1050째F), thus providing a good margin between design and operating conditions.

A photograph of a completed a u x i l i a r y tank i s shown i n Fig. 9; two of these tanks were b u i l t f o r corrosion loops FCL-3 and -4.

3.2.3

Piping system The main piping system c o n s i s t s of about 27 m (90 f t ) of 13-=-OD

1.07-mm-wall

(1/2 X 0.042-in.)

Ti-modified Hastelloy N tubing.

About 7 m

(24 f t ) of this l e n g t h i s included i n the h e a t e r s , and about 12 m (38 f t ) is i n t h e coolers.

Corrosion specimens are i n s t a l l e d a t t h r e e p o i n t s i n

t h e piping system, as described i n d e t a i l i n Section 3.2.4.

Fig. 9.

Auxiliary tank for ALPHA salt pump (1 in. = 25.4 mm).

The normal flow rate of s a l t i n t h e piping system i s 2.5 X

lo-'

m3/s

This gives a v e l o c i t y of about 3 m/s (10 fps) i n t h e 10.5-rmn-ID

(4 gpm). (0,413-in.)

tubing and Reynolds moduli i n t h e range of 6600 t o 14,000.

The design pressure and temperature f o r t h e piping system are 1.8 MPa (265 p s i a ) and 705'C

(1300째F), except i n h e a t e r s e c t i o n s , where a higher

metal temperature is permitted s i n c e t h e pressure is lower. 3.2.7

(See Section

f o r pressure-temperature design conditions i n t h e h e a t e r sections.) I n order t o ensure t h a t c y c l i c thermal stresses do not cause f a t i g u e

f a i l u r e , t h e piping system w a s analyzed using t h e MEC-21 piping f l e x i b i l i t y computer program* developed a t t h e Mare I s l a n d Naval Shipyard, San Francisco, Calif

3.2.4

Corrosion specimens Corrosion specimens are i n s t a l l e d a t t h r e e l o c a t i o n s i n t h e system

t h a t w e r e chosen t o expose t h e specimens t o t h r e e d i f f e r e n t s a l t temperatures.

Sample s t a t i o n 1 is l o c a t e d between t h e o u t l e t of cooler 2 and

t h e pump i n l e t , where t h e bulk s a l t temperature is 566OC (1050'F). 2 i s between h e a t e r s 1 and 2, where t h e s a l t temperature i s 635'C

Station (1175'F).

S t a t i o n 3 i s between t h e o u t l e t of h e a t e r 2 and t h e i n l e t t o c o o l e r 1, where t h e s a l t temperature i s 705OC (1300'F). Each of t h e t h r e e s t a t i o n s has provision f o r i n s e r t i o n and withdrawal of a specimen holder t h a t holds s i x specimens.

Each specimen, made of T i -

modifiedHastelloy N , is 0.86 mm t h i c k (0.034 in.), and 43 mm long ( 1 11/16 in.).

4.6 mm wide (0.181 in.),

The cross-sectional area of t h e specimen

holder is enlarged a t t h e upper end t o decrease t h e flow area of t h e salt. Therefore, t h e s a l t v e l o c i t y is a nominal 3 m / s (10 fps) over t h e lower t h r e e specimens and increases t o a nominal 6 m / s (20 fps) as t h e s a l t passes over t h e upper t h r e e specimens.

This design f e a t u r e allows e v a l u a t i o n of

v e l o c i t y e f f e c t s on t h e corrosion rates a t each of t h e t h r e e corrosion sample s t a t i o n s .

A cross-section drawing of a t y p i c a l corrosion specimen

s t a t i o n is shown i n Fig. 10. The corrosion specimens are i n s e r t e d and withdrawn through a s a l t f r e e z e valve and two b a l l valves a t each s t a t i o n .

This f e a t u r e allows f r e -

quent specimen removal a t minimum c o s t , s i n c e no c u t t i n g o r welding operat i o n s are required t o gain access t o t h e specimens w i t h i n t h e piping system.

ORNL-DWG 70-5629

MATCH LINEPRESSURE EQUALIZING LINE

FREEZE VALVE AND HEATER-

HEATER

-..,

HIGH VELOCITY SPECIM CROSS SECTION (3)

SPECIMEN

LOW VELOCITY SPEC1 CROSS SECTION (3

I I I I I ( I I I I I I J

INCHES

Fig. 10. Corrosion specimen i n s t a l l a t i o n and removal system f o r MSR-FCL-3 ( 1 i n . - = 25.4 mm).

24 Also, t h e specimens are attached t o t h e specimen holder by s p e c i a l c l i p s and 0.8-mm-diam

(0.031-in.)

w i r e t o eliminate welding operations during

i n s t a l l a t i o n of specimens on t h e holder. The f r e e z e valve serves as a block valve t o prevent escape of s a l t through t h e access p o r t during normal operation.

The two b a l l valves pro-

v i d e a n a i r lock f o r evacuation and helium purging during i n s e r t i o n o r withdrawal operations, s i n c e i t i s d e s i r a b l e t o minimize atmospheric contamination during specimen removal o r r e i n s e r t i o n . The s a l t w i l l u s u a l l y n o t b e drained from t h e loop during specimen examination, s i n c e t h i s might a l t e r t h e s a l t composition s l i g h t l y by mixing with t h e h e e l of s a l t remaining i n t h e fill-and-drain

tank.

The s a l t i n

t h e d r a i n tank can have s i g n i f i c a n t l y d i f f e r e n t impurity levels than t h e c i r c u l a t i n g s a l t due t o corrosion processes over long periods of t i m e o r due t o experimental s a l t chemistry modifications t h a t are sometimes made t o t h e pumped s a l t inventory.

The a b i l i t y t o change corrosion specimens

without s a l t drainage is a r e l a t i v e l y new f e a t u r e i n pumped s a l t corrosion loops a t ORNL and is expected t o be very u s e f u l i n p r e c i s e l y monitoring corrosion and mass t r a n s f e r phenomena. A t y p i c a l corrosion specimen removal and examination proceeds as

follows.

The thermal g r a d i e n t i n t h e s a l t loop is removed by lowering t h e

input of t h e main r e s i s t a n c e h e a t e r s while simultaneously turning o f f t h e

a i r blowers on t h e coolers.

The s a l t pump i s then stopped, and a l l gas

e q u a l i z e r l i n e s are opened between t h e t h r e e corrosion specimen s t a t i o n s and t h e f r e e l i q u i d s a l t s u r f a c e i n t h e pump a u x i l i a r y tank.

The t h r e e

corrosion specimen s t a t i o n s and pump a u x i l i a r y tank are a l l l o c a t e d a t t h e same vertical e l e v a t i o n t o permit f r e e l i q u i d s u r f a c e s a t a l l four l o c a t i o n s while t h e f r e e z e valves are melted.

Careful operation i s re-

quired t o ensure t h a t no sudden pressure surges o r unequal p r e s s u r e s occur d.uring specimen removal o r i n s e r t i o n , s i n c e t h i s w i l l l i f t s a l t above t h e normal s a l t levels i n t h e f r e e z e valves and r e s u l t i n plugged gas l i n e s o r damaged b a l l valves. P a s t experience on a similar loop has shown t h a t corrosion specimen removal, examination, r e i n s e r t i o n , and loop r e s t a r t i n g can b e accomplished

i n 8 hr.

25 3.2.5

Fill-and-drain The fill-and-drain

tank tank, as t h e name implies, is used i n r o u t i n e f i l l -

i n g and draining operations.

I t a l s o serves as a sump i n t o which loop con-

t e n t s may b e dumped i n t h e event of an emergency. t h e lowest p o i n t i n t h e system.

The tank i s i n s t a l l e d a t

The c y l i n d r i c a l fill-and-drain

tank is in-

s t a l l e d with t h e a x i s h o r i z o n t a l and is about 0.18 m i n diameter (7.1 in.) 4 (0.49 f t 3 ) . by 0.56 m long (22 in.), with an i n t e r n a l volume of ~ 1 liters The tank is provided with a series of nozzle connections f o r (1) f i l l i n g , (2) draining, (3) evacuation, (4) s a l t sampling, and (5) i n s t a l l a t i o n of l i q u i d - l e v e l probes.

A l l p a r t s of t h e tank t h a t are exposed t o s a l t are

f a b r i c a t e d of standard Hastelloy N except f o r t h e area of t h e low temperat u r e seals, where some s t a i n l e s s s t e e l materials are used. of t h e fill-and-drain A 33-mm-OD

(1-in.,

tank is shown i n Fig. 11. sched-40) nozzle extension with Teflon-seated b a l l

valve c l o s u r e i s provided f o r evacuation and s a l t sampling. (1-in.,

Two 3 3 - m - O D

sched-40) nozzles with Teflon compression seals are used f o r liquid-

level probe i n s e r t i o n .

A 13-m-diam

(0.5-in.)

tubing nozzle with compres-

s i o n f i t t i n g is provided f o r pressurizing, off-gas, tion.

A photograph

Another 13-mm-diam (0.5-in.)

and pressure equaliza-

tubing nozzle, normally capped o f f with

a compression f i t t i n g plug, is a v a i l a b l e f o r e x t e r n a l f i l l i n g and draining

of t h e tank.

Three 9.5-mm-diam

t h e loop fill-and-drain

(0.4-in.)

tubing connections are welded t o

lines.

Design pressure and temperature f o r t h e tank are 0.8 MJ?a (115 psia) and 648째C (1200OF) except a t t h e Teflon seals, where the design temperat u r e is 204OC (400OF) maximum.

Anticipated normal operating pressure and

temperature are 0.24 MPa (35 p s i a ) and 566OC (1050OF). 3.2.6

S a l t coolers The h e a t t h a t is added t o t h e s a l t i n t h e c i r c u l a t i n g loop by means

of resistance-heated pipes and by pumping power i n p u t is removed a t t h e two s a l t - t o - a i r

coolers, which are i n s t a l l e d i n t h e system i n series.

Cooling capacity is 100 kW (342,000 Btu/hr) f o r cooler 1 and 58 kW (200,000 Btu/hr) f o r cooler 2, f o r a t o t a l of 158 kW (542,000 Btu/hr).

, w

Each cooler w a s designed f o r 0.9 m 3 / s (2000 cfm) of ambient a i r flow from i n s i d e Bldg. 9201-3 by a c e n t r i f u g a l forced-draft fan.

However,

Fig. 11.

Fill-and-drain

tank f o r FCL-3 and -4 ( 1 i n . = 25.4.m).

a c t u a l f i e l d measurements on FCL-2 showed t h a t more than 1.4 m 3 / s (3000 cfm) is a v a i l a b l e with t h e present 2.2-kW

(3-hp),

1750-rpm blower motors.

Therefore, excess cooling capacity i s a v a i l a b l e on FCL-3 and FCL-4 i f needed.

The a i r flows over t h e finned h e l i c a l tubes of c o o l e r s and i s

then exhausted v e r t i c a l l y i n t o t h e high-bay area of t h e building.

Each cooler c o n s i s t s of four h e l i c a l c o i l s of finned tubing with a c o i l diameter of 0.46 m (18.1 in.)

and a p i t c h of 0.076 m (3.0 in.).

material is n i c k e l and f i n thickness is 1.6 mm (0.063 in.).

Fin

F i n s are

brazed t o t h e Ti-modified Hastelloy N tubes, using Coast Metals No. 52 brazing a l l o y .

The e f f e c t i v e l e n g t h s of t h e finned s e c t i o n s are 5.7 m

(18.8 f t ) f o r cooler 1 and 5.5 m (17.9 f t ) f o r cooler 2. The f i n s f o r coolers 1 and 2 have d i f f e r e n t o u t s i d e diameters and spacing. cooler 2.

The f i n i s 51 mm OD (2 in.)

f o r cooler 1 and 38 mm (1.5 in.)

for

The f i n spacing p i t c h i s 5.6 mm (0.22 in.) f o r cooler 1 and 8.5

mm (0.33 in.)

f o r cooler 2.

This d i f f e r e n c e i n f i n s i s used t o provide a

lesser degree of cooling i n cooler 2 i n o r d e r t o prevent freezing of s a l t i n t h e l a t t e r cooling stage.

The f i n spacing w a s increased from that used

i n an earlier corrosion loop, MSR-FCL-2,

because FCL-3 and FCL-4 have a

higher operating temperature a t t h e coolers and t h e r e f o r e r e q u i r e fewer f i n s t o reject t h e design h e a t load. MSR-FCL-2

A finned cooler c o i l f a b r i c a t e d f o r

i s shown i n Fig. 12 f o r information purposes.

The cooler c o i l s

f o r FCL-3 and FCL-4 were not completed p r i o r t o p r o j e c t termination but would have been similar t o Fig. 12.

A unique f e a t u r e of these coolers is t h e requirement t h a t they must

serve as ovens f o r preheating t h e i r r e s p e c t i v e p o r t i o n s of t h e system during s t a r t u p when t h e e n t i r e system must be heated t o a temperature above t h e l i q u i d u s of t h e s a l t .

The coolers are designed t o serve as

h e a t e r s a t t h i s t i m e , with electrical connections provided so t h a t t h e finned tubes are heated by d i r e c t electrical r e s i s t a n c e i n a manner s i m i l a r t o t h e main heaters.

A i r flow is r e s t r i c t e d a t t h i s t i m e t o t h e maximum

degree possible, n o t only by c u t t i n g o f f t h e blowers b u t a l s o by c l o s i n g t h e s p e c i a l l y designed a i r duct valves o r dampers t o f u r t h e r reduce natu-

r a l convection i n s i d e t h e coolers.

The cooler h e a t e r s are energized a t

a l l times, whether i n preheating operation o r during AT operation.

Power

i n p u t s of about 5 kW are required a t each cooler h e a t e r t o keep t h e fuel-

s a l t mixture from freezing.

A photograph of two of t h e cooler housings,

which discharge t h e heated a i r v e r t i c a l l y , is shown i n Fig. 13. Operation of corrosion loop MSR-FCL-2

showed that a modification of

t h e o r i g i n a l cooler design and o t h e r r e l a t e d scram f e a t u r e s w a s needed t o

reduce h e a t l o s s e s a t t h e coolers a f t e r a scram.

I n FCL-2,

any scram

.rl v1

& &

0 U U

rl lu

0 +I

rl 0 U

al M

5 2X

lu al

al d

0 0 U

. d

M .rl

0 0

. . ... . -

Fig. 13.

Cooler housings for corrosion loop FCL-3.

30 a c t i o n (manual o r automatic) turned o f f t h e main r e s i s t a n c e h e a t e r s , turned o f f t h e a i r blowers, closed t h e i n s u l a t e d dampers on t h e cooler housing, and stopped t h e ALPHA pump.

S a l t f r e e z i n g always occurred i n t h e coolers

of FCL-2 a f t e r loop scram, due t o t h e l a r g e mass of air-cooled m e t a l w i t h i n t h e cooler housing and t h e r e l a t i v e l y small mass of h o t s a l t w i t h i n t h e cooler c o i l s .

Temperature recordings from t h e bottom, c o l d e s t , p o r t i o n s

of t h e cooler c o i l s showed t h a t temperatures dropped as low as 26OOC a f t e r

a scram, which i s f a r below t h e s a l t l i q u i d u s of 500째C.

This d i d not cause

s i g n i f i c a n t problems during about 17,000 h r of operation o t h e r than delayi n g resumption of s a l t c i r c u l a t i o n f o r a few hours while gradual remelting occurred.

However, i n two shutdowns, pipe r u p t u r e and s a l t leakage

occurred because s a l t f r o z e i n another p o r t i o n of t h e loop i n a d d i t i o n t o t h e known f r e e z i n g i n t h e coolers.

Since t h e second frozen area w a s not

apparent t o t h e operators during e i t h e r i n c i d e n t , normal operating and remelting programs w e r e followed, which r e s u l t e d i n s a l t l i q u i d expansion and pipe r u p t u r e between t h e frozen c o o l e r s and t h e unsuspected s a l t plug. Several design modifications w e r e made t o FCL-2 t o reduce t h e l i k e l i hood of f u r t h e r i n c i d e n t s , o f t h i s type.

The scram c i r c u i t s w e r e r e v i s e d

t o provide continuous salt-pump operation a t a reduced speed of 2000 rpm a f t e r each scram i n l i e u of t h e previous scheme which provided f o r stopping t h e pump.

This provides more heat energy t o t h e cooled metal within

t h e cooler housing via t h e flowing salt.

Also, t h e cooler housing w a s

modified with i n t e r n a l thermal i n s u l a t i o n and added electric "guard" h e a t e r s t o reduce t h e mass of cold metal t o which t h e salt-containing cooler c o i l can t r a n s f e r heat.

The guard h e a t e r s are energized a f t e r t h e

cooling a i r i s flowing through t h e c o o l e r s and are automatically deenergized t o prevent overheating of t h e cooler i f a i r flow is i n t e r r u p t e d ,

as is done during a scram o r shutdown.

Thirdly, a n automatic solenoid

valve w a s added t o t u r n o f f a u x i l i a r y cooling a i r t o t h e h e a t i n g l u g s on t h e main r e s i s t a n c e h e a t e r s a f t e r a scram o r whenever t h e h e a t e r s are deactivated.

T e s t s of t h e FCL-2 automatic system shutdown from AT operation w e r e made t o v e r i f y t h a t t h e design modifications would prevent s a l t f r e e z i n g

i n t h e coolers a f t e r a scram.

The tests were successful and showed t h a t

t h e newly added automatic f e a t u r e s worked as planned; t h a t is, t h e pump

31 speed w a s reduced from design speed t o 2000 rpm, t h e guard h e a t e r s on t h e c o o l e r s were de-energized,

and t h e cooling a i r on t h e r e s i s t a n c e h e a t e r

Due t o t h e new design modifications, t h e s a l t continued

lugs w a s cut off.

t o flow a t a reduced rate a f t e r t h e scram and t h e isothermal c i r c u l a t i n g

s a l t temperature f e l l only t o 565°C (1050°F), which i s considered a s a f e level above t h e s a l t l i q u i d u s of 500°C (932°F). It w a s planned t o include t h e above design f e a t u r e s i n FCL-3 and FCL-4 because they worked s u c c e s s f u l l y i n FCL-2.

However, t h e molten-salt pro-

gram w a s canceled before t h e design changes were effected.

Therefore,

record design drawings f o r FCL-3 and FCL-4 do n o t show t h e s e changes, b u t they would have been included i f t h e program had proceeded t o completion. Record drawings of FCL-2 do show t h e s e various modifications. 3.2.7

Main h e a t e r s Power i n p u t t o t h e main h e a t e r of t h e loop is accomplished by means

of d i r e c t r e s i s t a n c e heating of a p o r t i o n of t h e piping. tubing, 12.7 mm OD (0.5 in.)

as h e a t e r s 1 and 2.

X 1.07 m m w a l l (0.042 in.),

Two s e c t i o n s of

are designated

Each h e a t e r is approximately 3.7 m long (146 in.),

and h e a t i n p u t a t each is 79 kW (270,000 Btu/hr) f o r a t o t a l of 158 kW (540,000 Btu/hr).

The h e a t f l u x f o r t h i s rate of h e a t i n p u t is 0.65 MW/m2

(205,000 Btu/hr f t 2 ) .

Each h e a t e r s e c t i o n has four l a r g e electrical lugs;

t h e two o u t e r l u g s are a t ground p o t e n t i a l and t h e two c e n t e r lugs are a t higher p o t e n t i a l .

A t design power, t h e voltage p o t e n t i a l from c e n t e r t o

end l u g is about 46 V, and t h e c u r r e n t i n t h e pipe w a l l is about 860 A. Pressure and temperature g r a d i e n t s through t h e two h e a t e r s e c t i o n s

are such t h a t t h e temperature of t h e s a l t i n c r e a s e s as pressure decreases.

This is b e n e f i c i a l i n t h a t t h e advantage of higher s t r e n g t h i n t h e metal w a l l of t h e piping is present a t t h a t p a r t of t h e h e a t e r t h a t must contain t h e higher pressure.

For h e a t e r 1, design and operating p r e s s u r e and tem-

p e r a t u r e range from 1.9 Ml?a (270 p s i a ) a t 670°C (1238°F) t o 1.6 MPa (235 p s i a ) a t 738°C (1360°F).

For h e a t e r 2, t h e s e values range from 1.48 MPa

a t 727°C (1340°F) t o 1.3 MPa a t 793°C (1460°F).

The s p e c i f i e d pneumatic

test pressure is 38.9 MPa (5640 p s i a ) a t room temperature f o r both h e a t e r s . Main loop h e a t e r s 1 and 2 and cooler h e a t e r s 1 and 2 are c o n t r o l l e d by i n d i v i d u a l s a t u r a b l e r e a c t o r s and a s s o c i a t e d monitoring and c o n t r o l

32 circuitry.

The monitoring and instrumentation c i r c u i t r y i s described i n

Sect. 3.4.

Main loop h e a t e r 2 i s automatically c o n t r o l l e d t o maintain a

s e l e c t e d h e a t e r o u t l e t temperature, while t h e o t h e r t h r e e d i r e c t r e s i s t a n c e h e a t e r s are manually set a t s e l e c t e d power levels.

The 110-kVA trans-

formers and s a t u r a b l e r e a c t o r s t h a t supply power f o r t h e main r e s i s t a n c e h e a t e r s of FCL-4 are shown i n Fig. 14. 3.2.8

Auxiliary h e a t e r s The a u x i l i a r y h e a t e r s trace t h e system piping, and i n d i v i d u a l h e a t e r

output is manually a d j u s t a b l e by operation of t h e a s s o c i a t e d v a r i a b l e transformer.

The operation of t h e h e a t e r s i s monitored and recorded by

thermocouples and recording instruments.

The proper v o l t a g e s e t t i n g i s

determined experimentally t o e s t a b l i s h the desired preheating temperature, and then mechanical s t o p s are i n s t a l l e d on t h e c o n t r o l l e r t o preclude accid e n t a l overheating by t h e operator. Tubular e l e c t r i c h e a t e r s are used f o r a u x i l i a r y heating on t h e loop components and a l l s e c t i o n s of piping t h a t are n o t d i r e c t r e s i s t a n c e heated.

The tubular-type a u x i l i a r y h e a t e r s are r a t e d 1640 W/m (500 W/ft),

230 V, and 815OC (1500OF) sheath temperature.

These h e a t e r s are operated

a t a maximum of 140 V, which provides a convenient method of d e r a t i n g commercially a v a i l a b l e 230-V h e a t e r s from 1640 t o 575 W/m (175 W/ft). This g r e a t l y i n c r e a s e s t h e l i f e of t h e h e a t e r s and consequently reduces maintenance and a s s o c i a t e d downtime of t h e f a c i l i t y . A l l tubular e l e c t r i c h e a t e r s are x-rayed before i n s t a l l a t i o n on t h e

loop piping t o p r e c i s e l y determine t h e l o c a t i o n of t h e heating c o i l within t h e heater.

P a s t experience has shown t h a t manufacturing t o l e r a n c e s on

t h e i n t e r n a l h e a t e r lead l e n g t h s are l a r g e enough t o create u n i n t e n t i o n a l frozen areas i n molten-salt piping systems unless such precautionary meas u r e s are used. Clamshell a u x i l i a r y h e a t e r s are used on t h e main loop h e a t e r piping systems 1 and 2 and a l s o on f r e e z e valves and connecting lugs.

These

h e a t e r s are r a t e d 115 V o r 120 V with maximum h e a t e r temperatures of 98OOC (1800'F).

These h e a t e r s are a l s o operated a t reduced voltage and power

f o r t h e reasons s t a t e d above.

Clamshell h e a t e r s were s e l e c t e d f o r t h e

d i r e c t r e s i s t a n c e heated s e c t i o n of t h e loop because they are mounted on

a rl

34 fired-lava spacers and thereby e l e c t r i c a l l y i n s u l a t e d from t h e voltage t h a t i s applied d i r e c t l y t o t h e piping and lugs.

H e l i u m cover-gas system

3.2.9

Dry oxygen-free helium i s supplied t o FCL-3 and FCL-4 by t h e cover-gas system previously used a t t h e Molten-Salt Reactor Experiment (MSRE).

This

gas system, shown schematically i n Fig. 15, is shared with t h e Coolant-Salt Technology F a c i l i t y , Gas-Systems Technology F a c i l i t y , and corrosion loop MSR-FCL-2.

H e l i u m i s normally supplied by one of two banks of t h r e e standard cylinders.

The supply l i n e has a pressure i n d i c a t o r and alarm (PIA-500E),

which i s a c t i v a t e d a t 2.2 MPa (300 psig); t h i s i s followed by a pressurereducing valve (PCV-SOOG), which lowers t h e supply pressure t o 1.8 MPa (250 psig).

This pressure is monitored by a high-low alarm switch (PA-

500) set a t 2.0 MPa (275 psig) and 1.5 MPa (200 psig).

The supply l i n e

a l s o has a tee leading t o t h e oxygen analyzer A02-548. The supply l i n e then branches i n t o two p a r a l l e l s t a i n l e s s s t e e l tubing l i n e s t o supply t h e two helium-treatment

stations.

The i d e n t i c a l branches

contain a tee t o a purge vent, gas-treatment equipment, a tee leading t o a r u p t u r e disk, a tee f o r a gas c y l i n d e r connection, and i s o l a t i o n valves. The purge vents, l i n e s 504 and 505, are used t o vent helium from cyl-

i n d e r s t h a t can be connected a t V-500B and V-500C t o backflush and regen-

erate t h e helium dryers. The v e n t s combine i n t o a s i n g l e tube t h a t cont a i n s a flaw i n d i c a t o r (FI-505) before t h e helium is vented t o t h e atmosphere. The r u p t u r e d i s k s i n l i n e s 506 and 507 provide overpressure p r o t e c t i o n f o r t h e helium-treatment

equipment.

These l i n e s a l s o contain high-pressure

alarms, PA-506 and PA-507, t h a t are set a t 2.0 MPa (275 psig). The two branches of t h e treatment system recombine as l i n e 500, which

is connected t o a flow-indicating c o n t r o l l e r and an air-operated c o n t r o l valve (FCV-500) min)

t h a t limits t h e supply gas flow t o 10 l i t e r s / m i n (0.35 f t 3 /

A t h i r d dryer (DR-3) is l o c a t e d downstream of FCV-500 i n t h e l i n e leading t o t h e treated-helium s t o r a g e tank and subsequently t o corrosion loops FCL-3 and FCL-4.

The gas supply f o r t h e corrosion loops tees o f f

8 ii

! s

n+s*

-@.I

I t

@:...@): h

d a, a,

5 0

M W

8 lu

M d

I 36 from l i n e 501, which s u p p l i e s t h e Coolant-Salt Technology F a c i l i t y , and then branches again f o r each of t h e corrosion loop f a c i l i t i e s .

The remain-

der of t h e gas l i n e s on corrosion loops FCL-3 and FCL-4 are shown on t h e instrument a p p l i c a t i o n diagrams, Figs. 20 and 21 of Section 3.4.8. i

The t h r e e gas dryers are f i l l e d with Linde molecular s i e v e No. 1 3 X and normally operate a t room temperature. by heating t o 205OC (400â&#x20AC;&#x2122;F) o f f accumulated moisture.

The d r y e r s can be regenerated

and flowing dry gas through t h e bed t o c a r r y The preheater is n o t normally used and is kept

Oxygen removal is accomplished by a high-temperature

a t room temperature. bed of titanium chips.

The operating bed is maintained a t 54OOC (lOOOÂ°F),

while t h e standby bed is kept a t 425OC (800OF). The helium gas leaving t h e MSRE helium p u r i f i c a t i o n system i s cons t a n t l y monitored f o r oxygen and water vapor content.

The impurity l e v e l s

are checked and logged a t least once each weekday by operating personnel t o ensure t h a t properly p u r i f i e d helium i s being supplied t o t h e experii

ments.

P a s t d a t a show t h a t t y p i c a l water vapor content i s about 0.2 ppm

by volume and t y p i c a l oxygen content is about 0.3 ppm by volume.

3.3

Electrical Systems

Figure 16 i s a one-line diagram of t h e p l a n t electrical d i s t r i b u t i o n system t o s u b s t a t i o n s 18E and 15E, which serve t h e FCL-3 and FCL-4 f a c i l i -

t i e s , respectively.

Figure 1 7 is a one-line diagram of t h e normal power

and emergency power electrical systems f o r FCL-3. t i o n is designed f o r FCL-4.)

(An i d e n t i c a l i n s t a l l a -

E l e c t r i c a l power f o r c o n t r o l s and instruments

t h a t are necessary f o r experimental operation, monitoring, and s a f e t y are supplied from both t h e normal power system and t h e diesel-generator emergency power system through automatic t r a n s f e r switches. Normal power i s supplied by TVA from a 154-kV network through a 40MVA, 154/13.8-kV

transformer t o a 13.8-kV bus d i s t r i b u t i o n system.

Circuit-

breaker 1332 and disconnect switch 1332EA s e r v e transformer 418E (13.8 kV, 460 V, 1500 kVA), which i n t u r n serves s u b s t a t i o n 18E.

C i r c u i t breaker

1333 and disconnect switch 1333EC s e r v e transformer 415E (13.8 kV, 460 V, 1500 kVA), which i n t u r n s e r v e s s u b s t a t i o n 15E.

. . .. ...

- - .

..~

... .

-..-. -

b 37

1 Y

223 MVA

FROM FX LOUOOUN 1536 MI.

446 MVA B U L L RUN

ORNL- DWG 76-1 6631

t i

+ IHKV

Y-12 N0.2 L I N E

I310

I -*.

,1311

I200A.

I Y

4 MVA Y A W FEEDER

LEGENl

2 MVA FILTER PLANT

d A

TRANSFORMER

I - DISCONNECT SWITCH AIR CIRCUIT BREAKER

< A

OIL CIRCUIT BREAKER POTHEAD /-

--I E I) \-

* -1500KVA. I38KV-46OV. A L L OTHERS IodoKVA,

YARD FEEDER

13.8 K V - 4 6 0 V.

I USR FCL-2

DWG E-IIC85-LRsOI-L

EXlSTlNG~

Fig. 16.

t MSR FCL-3

'LDWG

E-11628-ER-501-E

One-line diagram of area power supply.

ELECTRICAL I N T E R L M K

NOWWOY

'VOC

sr-cs

-wn1 29s

6 '1

r-_

I '

.. 8E

39 Emergency power i s supplied by a diesel-engine-driven

generator, r a t e d

300 kW, 460 V, 3 phase, 60 Hz, which is designed t o s t a r t automatically w i t h i n 20 Sec a f t e r a f a i l u r e of t h e normal 460-V power SUpplyD

Emergency

power i s supplied through an automatic t r a n s f e r switch t o provide resistance heating of c o o l e r s 1 and 2 and a l s o t o energize t h e four v a r i a b l e transformer c a b i n e t s t h a t s e r v e a l l a u x i l i a r y h e a t e r s f o r t h e piping sys-

tem. The ALPHA s a l t pump i s driven by a 15-kW (20-hp) variable-speed motor, which is supplied by a variable-frequency,

set.

The motor i s a squirrel-cage,

variable-voltage motor-generator

induction-type designed f o r 5000 rpm,

6 pole, 3 phase, 250 Hz, 260 V, open drop proof, NEMA design B, Class F

It is

i n s u l a t i o n , with vertical s o l i d s h a f t and mounting flange downward.

designed f o r continuous operation from 75 t o 250 Hz, with a constant torque load equivalent t o 15 kW a t 5000 rpm, with t h e supply v o l t a g e equal t o 1.04

times t h e frequency.

The motors were procured i n accordance with Job

S p e c i f i c a t i o n E-11628-ER-001-S-0. One d e s i r e d modification of t h e pump c o n t r o l system was n o t incorpor a t e d i n t h e drawings because t h e MSR p r o j e c t w a s canceled before t h e change w a s effected.

W e wanted t o alter t h e scram sequence so t h a t t h e

pump would continue t o operate a t a reduced speed of about 2000 rpm a f t e r any scram a c t i o n t o help avoid s a l t freezing i n t h e cooler c o i l s .

A de-

s i g n f o r providing such a speed reduction w a s n o t completed, b u t t h i s system would be d e s i r a b l e i f t h e loops were ever r e a c t i v a t e d and operated with a s a l t mixture having a r e l a t i v e l y high l i q u i d u s temperature. The motor-generator set is r a t e d a t 30 kVA.

The pump motor is

d i r e c t l y connected e l e c t r i c a l l y t o t h e generator output such t h a t t h e motor w i l l start when t h e generator is s t a r t e d .

The motor-generator

in-

s t a l l a t i o n f o r both FCL-3 and FCL-4 is shown i n Fig. 18. The FCL-3 electrical system drawing numbers and t i t l e s are shown on t h e drawing l i s t included as Appendix A.

The l i s t f o r FCL-4 is similar.

The FCL-4 electrical drawings were e s s e n t i a l l y complete, except f o r modif i c a t i o n s f o r low-speed pump operation a f t e r scram, when t h e p r o j e c t w a s canceled.

Due t o t h e c a n c e l l a t i o n , FCL-4 drawings w e r e not formally

approved o r issued.

41 Details of t h e main h e a t e r s and a u x i l i a r y h e a t e r s were discussed i n Sections 3.2.7

and 3.2.8. 3.4

3.4.1

Instrumentation and Controls

Temperature measurement and c o n t r o l There are approximately 125 numbered thermocouples i n each of t h e

FCL-3 and FCL-4 loops. type K (Cliromel-Alumel),

These thermocouples are i n d u s t r i a l grade (0.075%), with s t a i n l e s s s t e e l sheaths and MgO i n s u l a t i o n

and ungrounded measuring junctions.

ter; o t h e r s are 1.6 mm (0.063 in.)

Most are 1 mm (0.040 in.) i n diamei n diameter.

Of t h e 125 temperature

measurements, 53 are recorded on s t r i p - c h a r t recorders (42 of these are a l s o retiorded automatically on t h e Dextir d i g i t a l data-acquisition 6 are used with temperature-indicating

system);

switches i n alarm and/or s a f e t y

c i r c u i t s , while t h e remainder are indicated on a manually operated d i g i t a l temperature i n d i c a t o r . Temperature c o n t r o l of t h e e n t i r e e l e c t r i c a l preheating system f o r t h e loop piping and coolers is by manual adjustment of a number of v a r i a b l e auto transformers t h a t e i t h e r supply power d i r e c t l y t o r e s i s t a n c e h e a t e r s o r modulate c u r r e n t t h a t i s subsequently r e c t i f i e d and used t o c o n t r o l power supplied by s a t u r a b l e r e a c t o r s t o t h e r e s i s t a n c e heaters. The main r e s i s t a n c e h e a t e r s , which produce the temperature rise i n the salt flowing to metallurgical samples in stations 2 and 3, receive

t h e i r power from two s a t u r a b l e r e a c t o r s with step-down t r a n s f o r m e r s ' t o match t h e transformer impedance t o t h e load.

The s a t u r a b l e r e a c t o r sup-

plying r e s i s t a n c e h e a t e r 2 is c o n t r o l l e d by an automatic three-term (prop o r t i o n a l , d e r i v a t i v e , and r e s e t ) c o n t r o l l e r (TRC-6)

t h a t o p e r a t e s through

a magnetic amplifier. The s a t u r a b l e r e a c t o r supplying r e s i s t a n c e h e a t e r 1 is c o n t r o l l e d by TC-5, which is manually set t o provide a constant power input.

Both TC-5 and TRC-6 have electrical i n t e r l o c k s i n t h e h e a t e r con-

t r o l c i r c u i t s ( c i r c u i t s 2 and 3) t h a t prevent energizing t h e power t o t h e h e a t e r s without f i r s t a d j u s t i n g t h e c o n t r o l s t o minimum power input.

This

f e a t u r e reduces t h e p r o b a b i l i t y of operator e r r o r and a c c i d e n t a l overheating of t h e loop piping during r e s t a r t i n g of t h e loop.

These i n t e r l o c k s

42 are bypassed for a period of approximately 2 sec following a complete loss of power; this permits restoration of power following momentary power dips such as those caused by lightning. High-temperature limit switches are actuated by the thermocouples located on the downstream end of each of the main resistance heaters, and a low-temperature limit switch is actuated by a thermocouple located at the exit of cooler 2 to provide scram action as required. In addition, there is a high-temperature scram on each of the three metallurgical-samplestation freeze valves. 3.4.2

Pressure measurement and control

System pressure is maintained at a fixed value by supplying helium gas to the system through pressure regulator PV-H02A while simultaneously bleeding helium gas plus pump seal oil leakage via oil traps at a controlled rate through PdC-HllA. An absolute-pressure transmitter is located on each of the three metallurgical sample lines and on each of the two salt sample lines. These pressure measurements are used to ensure that pressures in all the sample lines are equalized during filling and sampling operations to prevent forcing salt into the gas lines. These five pressure signals are selectively indicated on digital pressure indicator PI-14 by operating switch PS-14. Additionally, the two pressure signals transmitted from the salt sample stations are recorded on a two-pen sfrip-chart recorder, since they indicate operating pressures of the pump bowl and drain tank. In addition to the above pressure measurements, five vacuum gages (Hastings) and numerous dial gages (pressure, vacuum, and compound) are located throughout the system. No direct measurements of salt pressure are included because of the

cost and complexity of instrumentation suitable for this purpose. 3.4.3

Pump speed measurement and control The pump speed is measured by a magnetic pickup and gear tooth

arrangement that is located just below the direct-drive coupling on the pump shaft. The pulses generated by the magnetic pickup are counted and

converted t o an analog c u r r e n t s i g n a l , which i s i n d i c a t e d on panel meter SI-11.

Pump speed is c o n t r o l l e d by a d j u s t i n g t h e frequency of a variable-

frequency motor-generator s e t t h a t s u p p l i e s power t o t h e pump d r i v e motor. Low pump speed, which i s d e t e c t e d by switch SS-11,

i n i t i a t e s a scram and

produces an alarm. 3.4.4

Power measurements Power supplied t o t h e main loop r e s i s t a n c e h e a t e r s i s measured by

thermal-watt converters and recorded on a two-pen s t r i p - c h a r t recorder (and on t h e Dextir d a t a system),with each pen recording t h e power d i s s i pated i n one of t h e two h e a t e r s . recording wattmeter b R - 1 1 .

Power t o t h e pump motor is recorded on

Power t o t h e two resistance cooler h e a t e r s

i s i n d i c a t e d on panel-mounted wattmeters. 3.4.5

Thermal conductivity measurement Thermal conductivity of t h e helium cover gas is measured by a heated

filament conductivity b r i d g e (CE-HO4A) and recorded on a s t r i p - c h a r t recorder.

The pure helium i n p u t t o t h e loop i s used as a r e f e r e n c e and com-

pared t o helium vented from t h e o i l c a t c h b a s i n of t h e pump.

This provides

a means of d e t e c t i n g helium contamination by a i r , moisture, and i m p u r i t i e s

from t h e s a l t .

The thermal conductivity measurement system w a s o r i g i n a l l y

used i n t h e e a r l y corrosion loops (MSR-FCL-1 and MSR-FCL-2)

t o monitor

boron t r i f l u o r i d e (BFs) c a r r i e d away from t h e sodium f l u o r o b o r a t e coolant s a l t w i t h i n t h e pump bowl.

The thermal conductivity system has been re-

t a i n e d f o r corrosion loops FCL-3 and ECL-4 p r i m a r i l y because i t has proved u s e f u l i n monitoring a i r and moisture contamination, p a r t i c u l a r l y from outgassing that occurs during i n i t i a l preheating operations. 3.4.6

D i g i t a l d a t a system (Dextir) A number of t h e d a t a p o i n t s , including temperatures, h e a t e r power,

and pump speed, are recorded on a c e n t r a l d i g i t a l data-acquisition system, which c o n s i s t s of Beckman Dextir data-collection hardware i n t e r f a c e d t o a D i g i t a l Equipment Corporation PDP-8 computer.

Data may b e converted on

l i n e t o engineering u n i t s and p r i n t e d o u t on a t e l e t y p e terminal o r they

44 may be recorded on magnetic tape and converted o f f l i n e by t h e IBM-360/75 (or other) computer. The 23-channel analog boxes and one 25-channel d i g i t a l box are ins t a l l e d on each of t h e FCL-3 and FCL-4 f a c i l i t i e s .

I n addition, a 43-

channel, 338.6 K (150째F), o r equivalent, thermocouple reference box i s i n s t a l l e d on each loop. Each d i g i t a l box of 25 channels is normally scanned automatically a t hourly i n t e r v a l s b u t may be scanned a t i n t e r v a l s of 5, 15, o r 30 min as

well.

Any box may be set t o scan continuously, o r a s i n g l e scan may be

i n i t i a t e d manually a t any t i m e . The Dextir system has t h r e e ranges of 0 t o 10, 0 t o 100, and 0 t o 1000 mV t h a t may be preselected f o r each i n d i v i d u a l channel.

Overall

accuracy i s 20.07% of f u l l scale, and r e s o l u t i o n i s one p a r t i n 10,000. 3.4.7

Block diagram Referring t o Fig. 19, Control System Block Diagram, t h e r e are two

sources of power f o r t h e test f a c i l i t y : There are a l s o two power buses,

b u i l d i n g power and d i e s e l power.

One bus is energized only from t h e build-

ing power source (normal TVA power) and s u p p l i e s power t o t h e main loop h e a t e r s , t h e cooler blowers, t h e damper motors, and t h e variable-frequency M-G set.

The o t h e r bus is energized from t h e building power source when

i t i s a v a i l a b l e , b u t is automatically switched t o t h e d i e s e l power source

i f t h e b u i l d i n g power f a i l s .

This bus s u p p l i e s power t o a l l h e a t e r s (ex-

c e p t t h e main loop r e s i s t a n c e h e a t e r s ) and t o t h e lube o i l pumps.

The ob-

jective of t h i s design is t o scram t h e loop, b u t keep t h e s a l t molten during TVA power outages, and t o ensure t h a t cooling o i l flow is maintained i n t h e c e n t r i f u g a l pump a t a l l t i m e s . 3.4.8

Instrument a p p l i c a t i o n diagram There are two drawings f o r each test loop comprising t h e Instrument

Application Diagram.

Figures 20 and 21 show t h e diagram f o r FCL-3 only,

because t h e diagrams f o r FCL-4 are i d e n t i c a l .

The f i r s t of t h e s e shows

t h e s a l t system, including t h e pump, t h e main loop h e a t e r s , t h e coolers, t h e fill-and-drain

tank, and t h e t h r e e m e t a l l u r g i c a l sample l i n e s with

i z a

46 -DWG 76-16590

;LI

I I I

: !

& -

Fig

20.

Instrument pplication diagram for MSR-FCL-3

- sheet

u s

t a

.rl

a c

0 d

ld 0

a a

.I4 d

. . d hl

k.l

.I4

-_.-

48 t h e i r a s s o c i a t e d f r e e z e valves.

The second drawing shows t h e helium sup-

ply system, t h e sample s t a t i o n valving, t h e lube o i l pumps, t h e vacuum systems, and the thermal conductivity measuring system.

These diagrams

are intended t o show schematically t h e instrumentation of t h e e n t i r e fac i l i t y and are not, of course, intended t o show o r imply any dimensional data. A complete l i s t of instruments shown on t h e s e diagrams i s given i n

Appendix E, and a l i s t of Instrumentation and Control drawings is included i n Appendix B. 3.4.9

Molten-salt l e v e l measurements S a l t level is measured i n t h e fill-and-drain

tank by "spark plug"-type

c o n t i n u i t y probes.

tank and i n t h e a u x i l i a r y

The l e v e l d e t e c t i o n c i r c u i t r y

operates w i t h a low ac voltage of approximately 6.3 V a t 60 Hz on t h e probe when i t i s n o t i n contact with molten salt.

This v o l t a g e drops t o approxi-

mately 1 V when the s a l t contacts t h e probe. 3.4.10

Molten-salt flow measurement Due t o t h e high c o s t and complexity of instruments s u i t a b l e f o r mea-

s u r i n g molten-salt flow d i r e c t l y , no d i r e c t flow measurements are made. I n l i e u of a d i r e c t measurement, t h e main loop r e s i s t a n c e h e a t e r s e c t i o n s are used as c a l o r i m e t r i c flowmeters.

By using t h e a u x i l i a r y h e a t e r s t o

make up f o r h e a t l o s s e s , t h e flow rate of t h e s a l t through t h e h e a t e r s e c t i o n s can be c a l c u l a t e d from measurements of t h e temperature r i s e and power i n p u t t o the resistance-heated s e c t i o n . 3.4.11 Control panels The c o n t r o l panels f o r corrosion loops FCL-2, FCL-3,

and FCL-4 are

shown assembled i n t h e experimental area of Building 9201-3 i n Fig. 22. Each of t h e new loops r e q u i r e s f o u r c o n t r o l panels with v a r i a b l e transformers f o r electrical preheating and f o u r special-purpose c a b i n e t s f o r t h e most frequently used controls.

Two a d d i t i o n a l c a b i n e t s are required

on each loop f o r d a t a logging and a u x i l i a r y instrumentation, b u t they are l o c a t e d behind t h e main panel and are n o t v i s i b l e i n Fig. 22.

a 0

u-l

SYSTEM LIMITATIONS, SET POINTS, AND PRECAUTIONS

The loop automatic instrumentation i s designed t o prevent (1) overp r e s s u r i z a t i o n , (2) overheating, (3) loop damage i f t h e pump stops, and (4) a c c i d e n t a l s a l t f r e e z i n g i f normal electric power supply is l o s t .

s p e c i f i e d l i m i t s are exceeded, t h e more c r i t i c a l parameters w i l l place t h e loop i n standby condition (scram) by turning o f f t h e main r e s i s t a n c e h e a t e r s , turning o f f t h e a i r coolers, and reducing t h e pump speed.

Pres-

s u r e r e l i e f valves PSV-HO2A and PSV-H14B, which are s e t t o relieve a t 0.3

MPa (30 p s i g ) , are l o c a t e d on t h e helium supply l i n e s t o t h e pump bowl and t o o t h e r gas systems t o preclude excess cover-gas pressure.

High-

temperature alarms are provided near t h e exit regions of t h e main resistance-heated s e c t i o n s 1 and 2.

P r o t e c t i o n a g a i n s t overheating i s particu-

l a r l y important on t h e main h e a t e r s because of t h e high h e a t f l u x i n t h e s e regions and corresponding r a p i d temperature rise i f salt flow is reduced o r stopped.

High-temperature alarm and scram a c t i o n t o t h e standby condi-

t i o n is a l s o provided on t h e t h r e e s a l t f r e e z e valves of t h e m e t a l l u r g i c a l specimen removal s t a t i o n s .

A Low-temperature alarm w a r n s of near f r e e z i n g

conditions a t t h e e x i t of cooler 2 via TIC-9, result.

and scram a c t i o n w i l l

Scram a c t i o n a l s o occurs i f t h e flow rate of l u b r i c a t i o n o i l

t o t h e pump i s low o r i f t h e helium cover-gas pressure drops below 117 kPa

(17 psia)

A number of less c r i t i c a l alarms provide operator information about

off-design conditions b u t do n o t place t h e loop i n standby.

These alarms

include l o w temperature on t h e guard'heaters of t h e coolers, low flow of t h e v e n t i l a t i o n a i r from t h e shielded loop enclosures, bypass of t h e buildi n g alarm, o r low o i l pressure a t PS-008.

A summary of a l l alarms and

r e s p e c t i v e parameter set p o i n t s is shown i n Table 4. The major precaution i n loop design i s t o prevent a c c i d e n t a l freezing of t h e s a l t w i t h i n t h e piping system.

Freezing of s a l t i s avoided because

melting operations can e a s i l y l e a d t o pipe rupture as t h e s a l t expands during reheating.

To t h i s end, t h e h e a t e r s on t h e piping should be arranged,

as much as p r a c t i c a l , so t h a t melting operations can be c a r r i e d o u t by progressing i n s h o r t increments of length from a f r e e surface, such as t h e

s a l t level w i t h i n t h e pump tank.

Emergency diesel-driven auxiliary power

Table 4.

Alarm summary f o r FCL-3 o r -4

Alarm conditions

Control action

Instrument No.

Set point

High loop temperature

Scram

TIC-7 (TE-SOlT) TIC-8 (TE-SO4Y)

790'C (1460'F) 84OOC (1550'F)

Low loop temperature Low pump speed Low loop pressure Low pump o i l flow Loss o f building power

Scram

TIC-9 (TE-S08T)

495'C

Scram

SI-11

2500 rpm

Scram

PR-15A

117 kPa (17 psia)

Scram

FI-005A

50% of normal flow

Cooler No. 1 blower off

Cooler No. 1 damper closes

Cooler No. 2 blower o f f

Cooler No. 2 damper closes

Interlocks bypassed (switches HS2, HS3, HS4, HS5, HS6, HS7, HS8)

Nonea

High temp. freeze valve SO9, MET sample 1

Scram

TIS-18 (TE-SO9C)

205'C

(400'F)

High temp. freeze valve S02, MET s a m p l e 2 High temp. freeze valve S06, MET sample 3

TIS-19 (TE-SO2C) TIS-17 (TE-SO6C)

205'C 205'C

(400'F) (400'F)

Cooler guard heater a t low temperature

Scram Scram None

Brown Recorder cabinet 11

93'C

Damper i n a i r duct

Off-on

PS-008

134 kPa (4.8 psig)

(925'F)

Scram and switch t o emergency power

Vent s tack flow

Nonea

Building alarm bypass

Nonea

Pump electric power l o s t

Scram

Lubrication o i l a t low pressure a Local alarm only.

Nonea

(200'F)

52 supply i s a v a i l a b l e i f normal electric power f a i l s , and automatic switching between power s u p p l i e s is provided.

A low-temperature alarm i s provided

a t t h e e x i t of cooler 2, and t h e loop w i l l automatically scram t o t h e standby- condition i f t h e s a l t temperature approaches 5OOOC (932째F)

automatic s a l t draining f e a t u r e s were included, as is normal f o r l a r g e r

test f a c i i i t i e s , because t h e c i r c u l a t i n g s a l t inventory is only about 5

liters (1.3 gal). The loop is operated within a shielded enclosure t o prevent operator i n j u r y due t o leakage of t h e high-temperature s a l t .

The shielded enclosure

i s v e n t i l a t e d by a n exhaust system, so t h a t smoke o r fumes from leakage are c a r r i e d t o a s t a c k on t h e roof.

V e n t i l a t i o n i s required because t h e molten

s a l t contains both beryllium and a small amount of alpha-radioactive material.

Constant a i r monitor f i l t e r s (two each) are l o c a t e d a t each end of

t h e enclosure, and these are p e r i o d i c a l l y removed and checked by Health Physics personnel t o ensure t h a t contamination levels are within safe

limits adjacent t o t h e loops. These corrosion loops generally o p e r a t e a t f u l l design conditions 24 hr/day, and t h e r e f o r e a l l instrument alarms are monitored both by l o c a l alarms and by an annunciator panel located a t t h e PSS o f f i c e .

An automatic

t i m e r switch t r a n s f e r s alarm s i g n a l s t o t h e PSS o f f i c e a t n i g h t and on weekends because someone is on duty t h e r e a t a l l times.

I n t h e event of

an alarm, operator personnel f a m i l i a r with t h e equipment are n o t i f i e d of t h e alarm condition from t h e PSS o f f i c e by telephone.

Operator personnel

are expected t o i n v e s t i g a t e t h e alarm condition by coming t o t h e operating

area t o determine appropriate action. The only s i g n i f i c a n t f i r e hazard of t h e f a c i l i t y is r e l a t e d t o t h e 8 l i t e r s of l u b r i c a t i o n o i l f o r t h e pump.

The s a l t w i l l n o t s e l f - i g n i t e

i n t h e event of a s a l t leak, b u t t h e s a l t temperature i s high enough t o i g n i t e t h e o i l i f t h e two f l u i d s mix a c c i d e n t a l l y .

An o i l catch pan is

provided around t h e pump bowl and bearing housing so t h a t any o i l leakage i n t h i s area w i l l s a f e l y d r a i n away r a t h e r than drop onto t h e thermal ins u l a t i o n and t h e h o t e x t e r i o r s u r f a c e s of t h e pump and piping.

Overhead

clearance a t t h e test f a c i l i t y is such t h a t an o i l f i r e could s a f e l y burn i t s e l f o u t without endangering o t h e r experiments o r t h e loop operators.

53 Instrumentation is provided t o allow t h e loop t o continue operation without scramming i n t h e event of electrical power d i p s o r b r i e f outages of 2 sec o r less. f

This f e a t u r e i s p a r t i c u l a r l y u s e f u l during t h e summer

months when severe electrical storms occur and momentary outages due t o l i g h t n i n g are frequent.

The coastdown t i m e of t h e ALPHA pump is such t h a t

some s a l t flaw is maintained during t h e 2-sec i n t e r v a l and the s a l t i n t h e coolers does not freeze.

Therefore, t h e power d i p instrumentation allows

t h e loop t o accumulate more operating t i m e a t design conditions and is p a r t i c u l a r l y b e n e f i c i a l during periods of unattended operation on n i g h t s and weekends.

OPERATION

Operation of corrosion loops MSR-FCL-3 vious operation of MSR-FCL-2

and -4 w i l l p r o f i t from pre-

f o r more than 19,000 h r , p a r t i c u l a r l y s i n c e

t h e r e is a high degree of commonality among t h e t h r e e systems.

Prior to

operation, standard p r a c t i c e d i c t a t e s

1. preparation of an operating manual describing t h e loop design and equipment, i n i t i a l ' s y s t e m check-out,

and d e t a i l e d operating proce-

dures ; 2.

posting of emergency procedures a t t h e loop c o n t r o l panel;

posting of a loop schematic diagram i d e n t i f y i n g s i g n i f i c a n t system components;

posting of an isometric diagram of t h e system i n d i c a t i n g t h e l o c a t i o n of electric h e a t e r s and t h e i r associated thermocouples and c o n t r o l l e r s . Due t o program c a n c e l l a t i o n , t h i s

5.1

r k w a s not completed.

I n i t i a l S a l t F i l l i n g of t h e Fill-and-Drain

Tank

The system i s readied f o r operation a f t e r completing pneumatic and helium l e a k t e s t i n g , electrical checkout, etc,, by baking o u t t h e piping system t o remove water vapor from t h e metallic surfaces.

Care must be

exercised t o ensure t h a t t h e pump cooling o i l is turned on before heating

54 begins.

The system is evacuated repeatedly t o $3 kPa (0.5 p s i a ) and re-

f i l l e d with p u r i f i e d helium t o purge moisture.

A high vacuum is s p e c i f i -

c a l l y avoided during evacuation of t h e loop piping, because t h e l i g h t turbine o i l i n t h e pump o i l c a t c h b a s i n would d i f f u s e under high vacuum pumping and contaminate i n t e r i o r s u r f a c e s of t h e loop piping. o u t and purging is completed, t h e fill-and-drain filling.

A f t e r bake-

tank is prepared f o r s a l t

A small t r a n s f e r pot containing about 20 kg (22 l b ) of f u e l s a l t

is attached t o t h e Swagelok compression f i t t i n g on t h e d r a i n tank dip-leg

access riser p i p e via 6.3-mm-OD Hastelloy N tubing.

X 0.9-mm-wall

(1/4-in.-OD

X 0.035-in.-wall)

The t r a n s f e r pot i s preheated t o about 705OC (1300째F),

and p u r i f i e d helium is bubbled through t h e d i p tube f o r a t least an hour t o s t i r t h e s a l t and ensure t h a t no s a l t segregation has occurred during melting.

F a i l u r e t o stir t h e s a l t can r e s u l t i n t r a n s f e r of an a t y p i c a l ,

segregated f u e l - s a l t mixture i n t o t h e d r a i n tank. t h e a d j u s t a b l e level probes i n t h e fill-and-drain

Prior to salt transfer, tank are set to observe

t h e d e s i r e d f i l l i n g level and t h e tank i s preheated t o about 600째C (1112OF). The helium pressure above t h e s a l t s u r f a c e of t h e t r a n s f e r p o t is increased s l i g h t l y t o f o r c e t h e molten s a l t through t h e t r a n s f e r l i n e i n t o t h e f i l l and-drain tank.

The proper s a l t level i n t h e fill-and-drain

tank can

e a s i l y b e obtained i f t h e end of t h e f i l l l i n e is l o c a t e d a t t h e d e s i r e d

s a l t elevation.

Of course, t h i s must b e done a t t h e time t h e s a l t t r a n s f e r

l i n e i s i n s t a l l e d i n i t i a l l y i n t h e d r a i n tank dip-leg access riser.

Salt

is t r a n s f e r r e d u n t i l i t rises above t h e end of t h e d i p tube, and then helium p r e s s u r e is reversed t o blow t h e s a l t back toward t h e t r a n s f e r pot. When t h e s a l t level reaches t h e end of t h e d i p tube, an a u d i b l e bubbling can b e heard as t h e helium flows back through t h e s a l t remaining i n the t r a n s f e r pot.

This method provides a p o s i t i v e method of f i l l i n g t o a

p r e c i s e level and a d d i t i o n a l l y blows most of t h e s a l t o u t of t h e t r a n s f e r l i n e when t h e s a l t t r a n s f e r is completed.

A f t e r t h e t r a n s f e r p o t is cooled

and removed, a s a l t sample is taken from t h e d r a i n tank and analyzed f o r contamination. Safety procedures r e q u i r e t h a t personnel wear p r o t e c t i v e c l o t h i n g while working on t h e s a l t - t r a n s f e r equipment whenever t h e s a l t is molten. This s a f e t y equipment c o n s i s t s of a long chrome l e a t h e r coat, chrome

55 l e a t h e r hood, and gloves.

Two men are required i n any s a l t - t r a n s f e r op-

e r a t i o n as a s a f e t y precaution. 5.2

F i l l i n g t h e Loop with S a l t

The o p e r a t o r s m u s t e s t a b l i s h cooling o i l flow through t h e pump before any h e a t is applied t o t h e pump bowl t o prevent damage t o bearings and

seals.

The loop piping is then readied f o r f i l l i n g by a d j u s t i n g t h e manual

v a r i a b l e transformer preheat c o n t r o l s u n t i l a l l piping and components are heated t o a t least 65OOC (1200째F). during preheating of t h e piping.

No s p e c i f i c heating rate is observed The a d j u s t a b l e transformers are normally

set a t t h e v o l t a g e required t o h e a t t h e piping t o about 65OOC (1200'F) allowed t o come t o equilibrium.

and

A l l gas e q u a l i z e r l i n e s are opened t o

allow pressure balancing between t h e f r e e s a l t s u r f a c e i n t h e pump bowl and t h e f r e e s u r f a c e s a t each of t h e t h r e e m e t a l l u r g i c a l sample s t a t i o n s . F i l l i n g of t h i s system i s a c r i t i c a l operation, because t h e four f r e e surf a c e s a t t h e pump and m e t a l l u r g i c a l sample s t a t i o n s f i l l simultaneously. Any surge of pressure o r sudden venting can cause s a l t level surging a t t h e m e t a l l u r g i c a l sample s t a t i o n , which r e s u l t s i n s a l t f r e e z i n g i n t h e \

small unheated gas l i n e s l o c a t e d j u s t above t h e f r e e z e valve elevation. An improper f i l l i n g technique and r e s u l t a n t s a l t surging can a l s o r e s u l t i n s a l t damage t o t h e Teflon p a r t s of t h e b a l l valve l o c a t e d about 21 c m ( 8 in.)

above t h e normal s a l t level w i t h i n t h e m e t a l l u r g i c a l sample sta-

tions.

About 5 liters (1.3 g a l ) of s a l t is required t o f i l l t h e loop t o

t h e normal operating level [i.e., a u x i l i a r y pump tank].

a s a l t depth of 10 cm (3.9 in.)

i n the

S a l t t r a n s f e r is h a l t e d by c a r e f u l pressure balanc-

ing between t h e d r a i n tank and t h e a u x i l i a r y pump tank, and then t h e sepa-

rate d r a i n l i n e s are cooled and frozen.

A f t e r t h e d r a i n l i n e s are frozen,

t h e m e t a l l u r g i c a l sample s t r i n g e r s are lowered through t h e i r r e s p e c t i v e

a i r locks and b a l l valves t o be immersed i n t h e s a l t .

The tee handles are

then disengaged from t h e m e t a l l u r g i c a l specimen s t r i n g e r s , t h e b a l l valves closed, and t h e f r e e z e valves e s t a b l i s h e d on each s t a t i o n . c i r c u l a t i o n may now commence by s t a r t i n g t h e ALPHA pump.

Forced s a l t

5.3

Bringing t h e Loop t o Design Conditions

The loop is brought from isothermal t o AT operation by f i r s t bringing t h e ALPHA pump t o normal operating speed of 5000 rpm t o create a flow rate of 2.5 X

loW4m 3 / s

(4 gpm) and then gradually applying t h e AT by incremen-

t a l manual i n c r e a s e s i n t h e main r e s i s t a n c e h e a t e r s with corresponding manual adjustment of t h e blower i n l e t dampers t o i n c r e a s e cooler a i r flow. P a s t experience with corrosion loop FCL-2 has shown t h a t an experienced operator can convert loop operation from isothermal t o AT conditions i n 0.5 h r o r less. A f t e r t h e system i s a t AT conditions, t h e guard h e a t e r s on t h e coolers must be manually set a t t h e i r proper heating range by a d j u s t i n g four varia b l e transformers.

These h e a t e r s i n c r e a s e t h e temperature of t h e m e t a l

mass w i t h i n t h e cooler a i r ducts during AT operation t o help prevent s a l t f r e e z i n g i n t h e event of a scram.

This f e a t u r e w a s added t o corrosion loop

FCL-2 after a c t u a l operating experience showed t h a t t h e small s a l t invent o r y of t h e loop came dangerously c l o s e t o f r e e z i n g a f t e r s p e c i a l manual

scrams during which t h e s a l t pump continued t o c i r c u l a t e s a l t a f t e r t h e

scram. #

A f t e r t h e loop temperatures are a t operating conditions, t h e power-dip c i r c u i t is actuated by pushing reset switch ES-9A.

I f t h e power-dip cir-

c u i t were n o t reset, t h e loop would scram i f any momentary power outage occurred.

After ES-9A is reset, t h e loop can t o l e r a t e a 2-sec power outage

and resume operation without alarm o r operator a s s i s t a n c e .

It i s noted

t h a t t h e power-dip c i r c u i t cannot be reset while any parameter t h a t scrams t h e loop is i n e i t h e r a scram condition o r bypassed.

The loop i s now a t

design conditions and ready f o r extended operation. 6. 6.1

MAINTENANCE

Maintenance Philosophy

Maintenance of t h e loop equipment within t h e shielded e c l o s u r e w i l l n o t be done while t h e piping is f u l l of s a l t and operating a t f u l l pump speed, because t h e pump discharge pressure is q u i t e high [i.e.,

(290 p s i a ) ] and any s a l t leakage might endanger personnel.

2.0 MPa

Minor r e p a i r s

t o instrumentation and c o n t r o l s w i t h i n t h e enclosure can be done with t h e loop f u l l of s a l t and with t h e pump stopped, s i n c e t h e maximum pressure within t h e loop is then about 0.136 MPa (5 psig).

Maintenance w i l l b e

performed by properly supervised and experienced craftsmen wearing pres c r i b e d s a f e t y clothing.

The e n t r y of personnel i n t o t h e f a c i l i t y shielded

enclosure is c o n t r o l l e d by t h e p r o j e c t leader.

A s a f e t y work permit and

t h e s a f e t y equipment i n d i c a t e d i n Table 5 are required f o r e n t r y i n t o t h e enclosure.

I f a s a l t l e a k occurs, r e s p i r a t o r s are required, i n a d d i t i o n

t o t h e equipment shown i n t h e t a b l e , u n t i l t h e s a l t s p i l l had been removed and the area approved by Health Physics personnel.

Table 5.

Safety requirements For enclosure entry

For opening salt piping

System empty and at ambient temperature

System empty with heat applied

Not permitted

System full of salt, pump stopped

Not permitted

System full, pump at full speed

Not permitted

Safety glasses and gloves.

bFull protective equipment gloves, and head cover.

- chrome leather suit,

kintenance is not permitted, but inspection by loop operators in full protective equipment (b) is sometimes required.

6.2

Normal Maintenance Requirements

During normal operation of loop FCL-3 o r FCL-4,

r o u t i n e checks, cali-

b r a t i o n s , and preventive maiptenance of t h e loop components, a u x i l i a r y equipment, and instrumentation are required t o minimize malfunction of t h e facility.

A check l i s t of t h e f a c i l i t y equipment and t h e required mainte-

nance is given i n Table 6.

Scram c i r c u i t s are p e r i o d i c a l l y t e s t e d during

a c t u a l loop operation t o ensure t h a t t h e required s a f e t y a c t i o n s occur.

58 Table 6.

Preventive maintenance check list

Equipment o r function

Action

Time between checks

Check alarms and scramsa Loop temperature, high (TIC-7, TIC-8) Loop temperature, l o w (TIC-9) Freeze valve temperature, high, MET sample 1 (TIS-18) Freeze valve temperature, high, MET sample 2 (TIS-19) Freeze valve temperature, high, MET sample 3 (TIS-17) Loop pressure, l o w (PR-15A) Pump cooling and l u b r i c a t i o n o i l flow, low

(FI-005A) Pump l u b r i c a t i o n o i l pressure, low Pump low speed Low-temperature alarm on cooler guard heaters Check and c a l i b r a t e temperature, pressure, and power recorders and c o n t r o l l e r s Temperature recorders Temperature i n d i c a t o r s Temperature c o n t r o l l e r s Pressure recorders Pressure transducers and pressure i n d i c a t o r s Loop power recorders Pump speed i n d i c a t o r s and conductivity c e l l Change vacuum tubes, TICS ALPHA pumpb Check pump l u b r i c a t i o n o i l low-pressure alarm (PS-008) Check speed with s t r o b e l i g h t Check l u b r i c a t i o n o i l sump l e v e l Check lower s h a f t seal leakage ( o i l ) Check upper s h a f t seal leakage (oil) Check d r i v e motor f o r excessive noise o r vibration Check M-G set f o r noise o r v i b r a t i o n Check l u b r i c a t i o n and cooling o i l system leakage Clean "auto clean" f i l t e r i n cooling and lubric a t i o n o i l system by r o t a t i n g wiper handle

aScram condition t r a n s f e r s loop from design (AT) operation t o standby

pump bearings and seals are designed f o r a t least 8000 h r operation; they may require less frequent replacement, as determined by experience.

59 ACKNOWLEDGMENTS W e express our thanks t o t h e many persons who contributed t o t h e design, f a b r i c a t i o n , and construction of molten-salt corrosion loops FCL-3 and FCL-4.

We s p e c i f i c a l l y acknowledge H. E. McCoy, R. E. MacPherson,

and J. R. Engel f o r p r o j e c t management and guidance; C. J. Claffey f o r mechanical design; C. W. C o l l i n s f o r vessel and piping stress a n a l y s i s ; W. E. S a l l e e f o r electrical design; and G. W. Greene f o r instrumentation

Messrs. Claffey, S a l l e e , and Greene a l s o contributed

and c o n t r o l design.

s e c t i o n s of t h i s design r e p o r t i n t h e i r r e s p e c t i v e s p e c i a l i t i e s .

J. R.

Keiser provided m e t a l l u r g i c a l advice; E. M. Lees and H. E. Robertson gave f a b r i c a t i o n and construction a s s i s t a n c e ; and Virginia Maggart provided

secretarial a s s i s t a n c e .

REFERENCES

1. W. R. Huntley and P. A. Gnadt, Design and Operation of a ForcedC i r c u l a t i o n T e s t F a c i l i t y (MSR-FCL-1) Employing Hastelloy N Alloy and Sodium Fluoroborate S a l t , ORNL/TM-3863 (January 1973). 2.

W. R. Huntley, J. W. Koger, and H. C. Savage, MSRP Semiannu. Progr. Rep. Aug. 31, 1970, ORNL-4622, pp. 176-8.

J. W. Koger, A Forced-Circulation Loop f o r Corrosion Studies: Hastelloy N Compatibility w i t h NaBFa-NaF (92-8 m o l e X ) , ORNL/TM-4221 (December 1972)

H. W. Jenkins e t al., "EMF and Voltametric Measurements on t h e U4+/U3+ Couple i n Molten LiF-BeF,-ZrF,," J. Electrochem. SOC. 116, 1712 (1969).

S. Cantor e t al., Physical P r o p e r t i e s of Molten-Salt Reactor Fuel, Coolant, and Flush S a l t s , ORNL/TM-2316 (August 1968).

S. Cantor, Density and Viscosity of Several Molten Fluoride Mixtures, ORNL/TM-4308 (March 1973).

J. W. Cooke, MSRP Semiannu. Progr. Rep. Aug. 31, 1969, OW-4449, 92.

J. H. G r i f f i n , Piping F l e x i b i l i t y Analyses Program MEC-21, (July 1964).

LA-2929

Appendix A

ELECTRICAL DRAWING LIST (MSR-FCL-3)

62 Electrical drawing list (MSR-FCL-3)

Drawing No.

Title

Size

E 11628 E R 501

E 11628 E R 502

E 11628 E R 503

Schematic DiagramPower

Sh. 2 -Normal

and Emergency

E 11628 E R 504

Schematic DiagramPower

Sh. 3 -Normal

and Emergency

E 11628 E R 505

Auxiliary Heaters and Elec. Power

E 11628 E R 506

Main Pump Motor

E 11628 E R 507

Exp. Piping Isometric -Heater and T/C Arrangement

E 11628 E R 508

Auxiliary Heater and Power Supply Schedule

E 11628 E R 509

Variac Cabinet No. 1 - Assembly and Wiring

E 11628 E R 510

Variac Cabinet No. 2 -Assembly

E 11628 E R 511

Variac Cabinet No. 3 - Assembly and Wiring

E 11628 E R 512

Variac Cabinet No. 4 -Assembly

E 11628 E R 513

Metering Cabinet No. 10 -Assembly

E 11628 E R 514

Exp. Area-Equipment Arrangement

- Plan

E 11628 E R 515

Exp. Area-Equipment Arrangement

- Elevations

E 11628 E R 516

S t a r t e r Rack Frames & Trans. Support Frame Assembly & Details

E 11628 E R 517

Main Pump DriveMotor Generator I n s t a l l a t i o n 1st F. Plans

E 11628 E R 518

Equipment Grounding

E 11628 E R 519

Electrical Auxiliary Details

E 11628 E R 520

Type "E" Variac Control Panel Diagram

Single-Line Diagram- Normal and Emergency Power Schematic Diagram - Sh. 1 - Normal and Emergency Power

- Schem.

Diag.

- Schematic

- Sh.

4 -Normal

and Control Diagram

and Wiring and Wiring and Wiring

- Assembly

& Wiring

Appendix B

INSTRUMENT DRAWING LIST (MSR-FCL-3)

64 Instrument drawing l i s t (MSR-FCL-3) Drawing No.

Size

Title

I-11628-QG-001

Instrument Application Diagram, Sh. No. 1

I-11628-46002

Instrument Application Diagram, Sh. No. 2

I-11628-46003

Control System Block Diagram

I-11628-QG-004

Typ. T/C I n s t a l l a t i o n and Dextir Tab.

I-11628-46005

Ann. Common Conn. M. E. D.

I-11628-QG006

Control C i r c u i t 1 through 1 3 M. E. D.

I-11628-46007

Control C i r c u i t 14 through 33

I-11628-QGOO8

Ann. C i r c u i t No. 50 through 67

I-11628-QG-009

AC Power M. E. D.

I-11628-QG010

Power Measurement Control C i r . 45 through 48

I-11628-QGO11

Conductivity Measuring System M. E. D.

I-11628-46012

Pressure Transducers M. E. D.

1-116 28-QG 013

M. E. A. Diagram f o r M-G S e t and Clutch

I-11628-46014

T/C Tabulation

I-11628-QGO15

Instrument Cabinets No. 5, 6, 7, 8, and 9, Front Elev.

I-11628-QGO16

Instrument Panels D e t ' s . cutouts

No. 5E, 6C, 6D, and 6E

I-11628-46017

Instrument Panels D e t ' s . 86 c u t o u t s

No. 7C, 7D, 7E, 8D, and

I-11628-46018

Instrument Panels D e t ' s . outs

No. 5C, 5F, and 9C Cut-

I-11628-QG-019

Cabinet No. 5 Rear V i e w

I-11628-QG-020

Cabinet No. 6 Rear V i e w

I-11628-QGO21

Cabinet No. 7 Rear V i e w

I-11628-QGO22

Cabinet No. 8 Rear V i e w

1-11628-46023

Graphic Symbols

I-11628-QGO24

Relay Mounting Board Details

1-11628-46025

Side P l a t e and Ground Bus Details

I-11628-QGO26

Leeds and Northrup CAT Control Modifications

I-11628-QG02 7

Instrument Cab. No. 5 Wiring Table

I-11628-QGO28

Instrument Cab. No. 6 Wiring Table

Drawing No.

Size

Title

I-11628-QG-029

Instrument Cab. No. 7 Wiring Table

I-11628-QG-030

Instrument Cab. N o . 8 Wiring Table

I-11628-46031

Instrument Cab. No. 10 Wiring Table

I-11628-46032

Level Element Control Box LS-10 Details and Assembly

Appendix C

MECHANICAL DRAWING LIST (MSR-FCL-3)

68 Mechanical drawing l i s t (MSR-FCL-3) Drawing No.

Size

Title

P 11628 E R 002

V i e w s (B-B, men t

P 11628 E R 003

Plan and Elevation Loop Piping and Equipment

M-11628 E R 004

Cooler No. 1 Assembly

M 11628 E R 005

Cooler No. 2 Assembly

M 11628 E R 006

Removable Specimen Assembly

M 11628 E R 007

Removable Specimen Details

M 11628 E R 008

Removable Specimen Details

M 11628 E R 009

Cooler No. 2, Details of Lower Housing and Supp o r t Legs

M 11628 E R 010

Coolers No. 1 and 2, Subassembly of Core and Dampers

M 11628 E R 011

Coolers No. 1 and 2, Upper Removable Duct and Details

M 11628 E R 012

Blower and Duct Assembly No. 1 and 2 Blowers

M 11628 E R 013

Blower Duct Details f o r No. 1 and 2 Blowers

P 11628 E R 014

Cooler No. 1 Coil Weldment and Details

P 11628 E R 015

Cooler No. 2 Coil Weldment and Details

M 11628 E R 016

Fill-and-Drain

M 11628 E R 017

Cooler No. 1 Subassembly Lower Housing

S 11628 E R 018

Support Frame Assembly Plan

S 11628 E R 019

Support Frame Details, Sh. 1

S 11628 E R 020

Support Frame Details, Sh. 2

P 11628 E R 021

Special F i t t i n g s and Freeze Valve

M 11628 E R 022

Resistance Heater No. 2

M 11628 E R 023

Pump Auxiliary Tank

P 11628 E R 024

Lube O i l and Purge G a s Cabinet Piping

M 11628 E R 025

Location and Service Piping, FCL 3 and 4

M 11628 E R 026 M 11628 E R 027

E E

Enclosure Exhaust Duct and Support Weldments Service Piping for FCL-3 and -4

M 11628 E R 028

Enclosure (Shielding) Assembly

M 11628 E R 029

Enclosure (Shielding) Section and Details

C-C,

and D-D) Loop Piping and Equip-

Tank Assembly and Details

I , Drawing

No.

Title

Size

M 11628 E R 030

Enclosure (Shielding) Section and Details

M 11628 E R 031

Enclosure Panels

M 11628 E R 032

Enclosure (Shielding) Weldment

M 11628 E R 033

Sampler Assembly and Details

P 11628 E R 034

Corrosion Specimen and S a l t Sample Valving, Vacuum and H e l i u m Service

S 11628 E R 035

Purge Gas Cabinet

S 11628 E R 036

Purge G a s Cabinet -*Details

P 11628 E R 037

Lube O i l and Purge G a s Cab. Piping Sections, Weldments & Details

S 11628 E R 039

Support Frame Details, Sh. 3

R 040

Support Frame Assembly Elevation

M 11628 E R 041

Auxiliary Tank Details

M 11628 E R 042

Miscellaneous Details

M 11628 E R 043

Resistance Heater No. 1

M 11628 E R 044

Lube O i l and Purge Gas Cabinet Details

M 11628 E R 045

C i r c u l a t i n g Pump Drive Motor Assembly

M 11628 E R 046

F l e x i b l e Coupling

S 11628 E

Appendix D

ALPHA PUMP DRAWING LIST (MSR-FCL-3 AND -4)

72 ALPHA pump drawing l i s t (MSR-FCL-3 Drawing

and -4)

Title

Size

M 11628 E R 101

ALPHA Pump Assembly

M 11628 E R 102

Outer Bearing Housing Assembly

M 11628 E R 103

S e a l Details

M 11628 E R 104

Inner Shaft and Details

M 11628 E R 105

Inner Bearing Hous ing

M 11628 E R 106

Details

M 11628 E R 107

Shaft Assembly

M 11628 E R 108

Pump Impeller

M 11628 E R 109

Casing Sleeve

M 11628 E R 110

Outer Bearing Housing Weldment

M 11628 E R 111

Pump Casing Blank

M 11628 E R 1 1 2

Details

M 11628 E R 113

D et a i l s

M 11628 E R 115

Shroud Assembly

M 11628 E R 116

Shaft

M 11628 E R 1 1 7

Polygon Gages

Appendix E

INSTRUMENT LIST FOR FCL-3 OR -4

. ... .

" _ _

.- .

....

.. ..- ..

Instrument l i s t f o r FCL-3 o r -4 ._

Instrument

Service

Description

Location

CE-H04A

Thermal conductivity

GOW-MAC 24-100

Valve box

CR-16

Conductivity recorder

Minneapolis-Honeywell Class 15, s i n g l e pen

Panel 5D

CX-16

Conductivity power supply and controller

GOW-MAC

ECO-S07A

Cooler h e a t e r 1 c o n t r o l

6 kVA single-phase s a t u r a b l e reactor

Electrical equip. rack

ECO-S08A

Cooler h e a t e r 2 c o n t r o l

6 kVA single-phase s a t u r a b l e reactor

Electrical equip. rack

EeE-S 01A

P o t e n t i a l transformer 0 . 5 ~ 1

GE type JE-27;

C a t . No. 760X90G119

Cab i n e t 1 0

EeE-SO1B

P o t e n t i a l transformer 0.5:l

GE type JE-27; C a t . No. 760X90G119

Cabinet 1 0

EeE-S04A

Po t e n t i a l transformer 0.5 :1

GE type JE-27; C a t . No. 760X90G119

Cabinet 10

EeE- SO4B

P o t e n t i a l transformer 0.5:l

GE type JE-27; C a t . No. 760X90G119

Cabinet 1 0

EeE-S07A

P o t e n t i a l transformer 0.25:l

GE type JE-27;

C a t . No. 760x906126

Cabinet 10

EeE-'SO 8A

P o t e n t i a l transformer 0.25:l

GE type JE-27; C a t . No. 760X90G126

Cabinet 10

EeI-5

Saturable reactor control v o l t s

Weston 0-150 VDC Model 301-57

Panel 8C

EeI-6

Saturable reactor control volts

Weston 0-150 VDC Model 301-57

Panel 8C

Panel 8 D

24-510

. ...

c Instrument

Service

No.

Description

Location

EeI-11

Clutch v o l t s

Weston 0-300 VAC Model 744

Panel 7D

Ef 1-11

M-G s e t frequency

Louis Allis 0-400 CPS

Panel 7D

EiE-SOlA,

Current transformer

Esterline-Angus Model D 800:s

On 110 kVA XFORMER Sec

EiE-SOSA,

Current transformer

Esterline-Angus Model D 800:s

On 110 kVA XFORMER Sec

E iE-S 0 7A

Current transformer

GE type JAK-0 400:s

Elect. equip. rack

E iE- SO 8A

Current transformer

GE type JAK-0 400:s

Elect. equip. rack

EiI-11

Clutch c u r r e n t

Weston 0-5 A ac, Model 744

Panel 7D

EI-10

M-G set "power on" i n d i c a t o r

P i l o t l i g h t , 115 V, green l e n s

Panel 8C

EI-11

Clutch "power on" i n d i c a t o r

P i l o t l i g h t , 115 V, green l e n s

Panel 8 C

ES-6

Damper motor power switch

Allen Bradley B u l l e t i n 800T

Panel 6C

ES-7

Damper motor power switch

Allen Bradley B u l l e t i n 800T

Panel 6C

ES-32

Remote vent switch

Allen Bradley B u l l e t i n 800T

Panel 7C

EV-H1 OB

Solenoid vent valve

ASCO 8262B208, o r equal

Valve s t a t i o n

EwA-4

Loss of blower power alarm

Tigerman 416 NCL-52 annunciator

Panel 6A

EwA-5

Loss of blower power alarm

Tigerman 416 NCL-52 annunciator

Panel 6A

. .

...

."...

Instrument NO

...

Service

Description

Location

EWE- SOlA

Power t o m i l l i v o l t transducer

Sangamo type (37-10, Cat. No. S1477

Cabinet 10

EwE-SO~A

Power t o m i l l i v o l t transducer

Sangamo type CW-10,

Cabinet 10

EwI-SO~A

I n d i c a t i n g wattmeter

GE Model AB-10

Panel 5E

EwI-S 0 8A

Indicating w a t t m e t e r

GE Model AB-10

Panel 5E

EWR-11

Pump power recording wattmeter

E s t e r l i n e Angus Model AW

Panel 8D

EwR-12

Main loop h e a t e r 1 power

Minn.-Honeywell

Class 15, 2 pen

Panel 8B

EwR-13

Main loop h e a t e r 2 power

Minn.-Honeywell

Class 15, 2 pen

Panel 8B

EwS-4

Cooler 1 power switch

Allen Bradley B u l l e t i n 800T

Panel 6D

EwS-5

Cooler 2 power switch

B u l l e t i n 800T

Panel 6D

FA-OO5A

Oil-flow-low

alarm

Tigerman 416 NCL-S2 annunciator

Panel 5A

FA-66

Enclosure exhaust low-flow alarm

Tigerman 416 NCL-S2 annunciator

Panel 7A

FE-005A

T o t a l o i l flow o r i f i c e

Fabricated in-house

O i l pump discharge

FE-66

Enclosure exhaust flow switch

Honeywell type 543B 1019-1

I n exhaust duct

FI-HO8A

Bubbler flow i n d i c a t o r and o i l t r a p

M e r i a m Model C-1241

System vent

C a t . No. S1477

line FI-H08B

Bubbler flow i n d i c a t o r and o i l t r a p

M e r i a m Model C-1241

System vent line

Instrument

Service

No.

Description

Location

FI-006A

ALPHA pump l u b r i c a t i o n o i l flow

Rotameter, Brooks Model 8-1110-10, o r equal

Pump l u b r i c a t i o n oil line

FI-00 7A

ALPHA pump coolant o i l flow

Rotameter, Brooks Model 8-1110-10, o r equal

Pump coolant 1i n e

FI-W04A

Water flow t o o i l cooler

Rotameter, Brooks Model 8-1110-10, o r equal

Water coolant

line

FI-11A

O i l leakage t r a p

M e r i a m Model C-1241

I n valve box

FI-11B

O i l leakage t r a p

Meriam Model C-1241

I n valve box

FI-11C

Off-gas flow i n d i c a t o r

Fischer and P o r t e r Model 10A 1340

I n valve box

FI-13A

Pump helium purge flow

Fischer and P o r t e r Model 10A 1340

ALPHA pump purge line

FI-25A

Helium flow t o fill-and-drain

FS-005A

tank

F i s c h e r and P o r t e r Model 10A 1340

Panel 6D

Oil-f low-low alarm switch

Meletron Model 402

Across FE 005A

FV-H06A

Pump purge vent check valve

Whitey B-4C4-1/3,

o r equal

Valve box

FV-HO 7A

Fill-and-drain

tank vent check valve

Whitey B-4C4-113,

o r equal

Valve box

FV-HO9A

Conductivity c e l l bypass check valve

Whitey B-4C4-1/3,

o r equal

Valve box

FV-004A

O i l pump discharge check valve

01C W547Y, o r equal

O i l pump

FV-005A

O i l pump discharge check valve

01C W547Y, o r equal

O i l pump

-I

Instrument

Service

Description

Location

FV-H32

Pump o i l leakage check valve

Whitey 8-4C4-1/3,

HC-S07A

Cooler 1 power a d j u s t e r

General Radio Model W2 w/rect.

Panel 5F

HC-S07B

Cooler 2 power a d j u s t e r

General Radio Model W2 w/rect.

Panel 5F

HS-1OA

M-G

Cutler-Hammer maintain contact

Panel 7D

HS-1OB

M-G set motor s t o p switch

Cutler-Hammer maintain contact

Panel 7D

HS-11A

Clutch v o l t a g e on switch

A l l e n Bradley B u l l e t i n 800T

Panel 7D

HS-11B

Clutch v o l t a g e o f f switch

Allen Bradley B u l l e t i n 800T

Panel 7D

HS-11C

Clutch v o l t a g e a d j u s t switch

GE SB switch

Panel 7D

HV-AO1A

Adjust cooling a i r t o f r e e z e valve SO6

Hand valve, Whitey B-1V56, o r equal

Panel 6C

HV-A0 3A

Adjust cooling a i r t o f r e e z e valve SO9

Panel 6C

HV-A05A

Adjust cooling a i r t o f r e e z e valve SO2

Panel 7C

HV-AO7A

Adjust cooling a i r t o f r e e z e valve S12

Panel 6E

HV-AOgA

Adjust cooling a i r t o f r e e z e valve S13

Panel 6E

HV-A1lA

Adjust cooling a i r t o f r e e z e valve S11

Panel 7E

HV-A13

Adjust cooling a i r t o h e a t e r l u g H

I n s i d e encl.

HV-A14

Adjust cooling a i r t o h e a t e r lugs F & G

I n s i d e encl.

set motor s t a r t switch

o r equal

I n s i d e encl.

c Instrument

Service

Description

Location

HV-A15

Adjust cooling a i r t o h e a t e r l u g s B & C

HV-A16

Adjust cooling a i r t o h e a t e r l u g E

I n s i d e encl.

HV-A17

Adjust cooling a i r t o h e a t e r l u g D

I n s i d e encl.

HV-Al8

Adjust cooling a i r t o h e a t e r l u g A

I n s i d e encl.

HV-EO1A

Equalize pressure between l i n e s E01 and E02

Panel 6C

HV-EO1B

Block l i n e t o PT-EO1A

I n s i d e encl.

HV-EO2A

Equalize p r e s s u r e between l i n e s E02 and E05

Panel 6E

HV-EO 3A

Equalize pressure between l i n e s E02 and EO 3

Panel 6C

HV-EO 3B

Block l i n e t o PT-E03A

I n s i d e encl.

HV-EO 4A

Equalize p r e s s u r e between l i n e s E02 and E04

Panel 6C

HV-EO 5A

Equalize pressure between l i n e s E04 and E05

Panel 6C

HV-E06A

Equalize pressure between l i n e s E02 and EO 6

Panel 7C

HV-E06B

Block l i n e t o PT-E06A

I n s i d e encl.

HV-HOlA

Line H01 from GSTF/CSTF H e system

A t helium supply

Whitey B-1K54,

o r equal

I n s i d e encl.

__ _. . . .. ..

-. -...

. . ...

Instrument NO

...

.. . . . . . ...

.-.

.. .... . , .

Service

. ..

..,

._.

Description

Location

Whitey B-1K54, or equal

At helium supply station

HV-HO1B

In line to electrochemical probe

HV-HO1C

In helium supply system

Panel 6E

HV-H02A

In helium line H02

Panel 6E

HV-H02B

In line to helium heat exchanger

In valve station

HV-H03A

Conductivity cell bypass valve

HV-H04A

Conductivity cell block valve

HV-H05A

Conductivity cell "zero" valve

IIV-HO6A

ALPHA pump purge block valve

HV-HO7A

Fill-and-drain tank purge block valve

HV-HO 7B

Fill-and-drain tank purge block valve

HV-H08A

FI-H08A drain valve

HV-H08B

FI-H08B drain valve

HV-H09A

Conductivity cell bypass valve

HV-H1OA

ALPHA pump purge block valve

HV-H11A

FI-H11A drain valve

HV-H11B

FI-H11B drain valve

Instrument

NO.

Service

Description

HV-H 1 1 C

ALPHA pump purge t h r o t t l i n g valve

Hoke 2 PY 281, o r equal

HV-H11D

ALPHA pump purge block valve

Whitey B-1K54,

HV-H11E

ALPHA pump purge block valve

HV-H11F

Conductivity c e l l c a l i b r a t i o n p o r t

HV-H11G

O i l c a t c h tank d r a i n valve

HV-H12A

Pump gasket b u f f e r gas supply valve

HV-Hl2B

Pump gasket b u f f e r gas supply v a l v e

HV-H13A

Pump purge gas supply valve

HV-H14A

H e l i u m s t a t i o n b o t t l e valve

Supplied with helium b o t t l e

On helium b o t t l e

HV-H14B

H e l i u m supply valve ( u t i l i t y )

Whitey B-1K54,

H e l i u m b o t t l e station

HV-H14C

Helium b o t t l e supply block valve

HV-Hl5A

MET sample s t a t i o n 3 H e supply valve

In valve s t a t i o n

o r equal

H e l i u m b o t t l e station MET sample s t a t i o n

3 HV-H15B HV-H16A HV-H16B

Instrument NO HV-H17A

Service

Description

Location

MET sample station 1 He supply valve

Whitey B-1K54, or equal

MET sample station 1

HV-H17B HV-H18A HV-H18B HV-H19A

Salt sample station 1 He supply valve

Salt sample station 1

Salt sample station 2 He supply valve

Salt sample station 2

MET sample station 2 He supply valve

MET sample station 2

HV-H19B HV-H20A HV-H20B HV-H21A HV-H21B HV-H2 2A HV-H22B HV-H2 3A HV-H23B HV-H24A HV-H24B

Instrument NO

Service

Description

HV-HSA

Fill-and-drain

tank He t h r o t t l i n g valve

Whitey B-1V54,

o r equal

Panel 6E

HV-H25B

Fill-and-drain

tank vent valve

Whitey B-1K54, o r equal

Panel 6D

HV-HSC

Fill-and-drain

tank block valve

Whitey B-1K54, o r equal

Panel 6D

HV-H26A

Fill-and-drain

tank block valve

Whitey B-1K54,

Panel 6E

HV-001A

O i l c o o l e r d r a i n valve

Nibco/Scott T-235Y,

o r equal

O i l cooler

HV-001B

O i l c o o l e r l e v e l i n d i c a t o r block valve

Nibco/Scott T-235Y,

o r equal

O i l cooler

HV-001C

O i l cooler l e v e l i n d i c a t o r block valve

Nibco/Scott T-235Y,

o r equal

O i l cooler

HV-002A

O i l pump 2 i n l e t block valve

Hammond 1B643, o r equal

O i l pump 2 inlet

HV-00 3A

O i l pump 1 i n l e t block valve

Hamond 1B643, o r equal

O i l pump 1 inlet

HV-006A

Lubrication o i l t h r o t t l i n g valve

Powell Fig. 180A, o r equal

Lubrication oil l i n e

HV-00 7A

Cooling o i l t h r o t t l i n g valve

Powell Fig. 180A, or equal

Cooling o i l 1i n e

HV-SO2A

MET sample s t a t i o n 1 b a l l valve

Worchester No. 466-T-SW

MET sample station 1

HV-SO 2B

MET sample s t a t i o n l b a l l valve

Worchester No. 466-T-SW

MET sample station 1

o r equal

Instrument NO rn

Service

Description

Location

HV-SO6A

MET sample station 3 ball valve

Worchester No. 466-T-SW

MET sample station 3

HV-S06B

MET sample station 3 ball valve

MET sample station 3

HV-SO9A

MET sample station 2 ball valve

MET sample station 2

HV-S09B

MET sample station 2 ball valve

MET sample station 2

HV-S14A

Salt sample station 1 ball valve

Salt sample station 1

HV-S14B

Salt sample station 1 ball valve

HV-S14C

Auxiliary tank helium valve

Whitey B-1K54, or equal

HV-Sl4D

PT-S14A block valve

Whitey B-lK54, or equal

HV-S 15A

Salt sample station 2 ball valve

Worchester No. 466-T-SW

Salt sample station 2

HV-S15B

Salt sample station 2 ball valve

Worchester No. 466-T-SW

Salt sample station 2

HV-S15C

PT-S15A block valve

Whitey B-1K54, or equal

Salt sample station 2

HV-VOLA

Vacuum pump isolation valve

WRC 1253 3/4, or equal

Vacuum pump inlet

HV-V02A

MET sample 3 vacuum valve

Whitey B-1K54, or equal

MET sample 3

HV-VO3A

MET sample 1 vacuum valve

MET sample 1

HV-V04A

Salt sample 1 vacuum valve

Met sample 3

HV-VOSA

Salt sample 2 vacuum valve

Salt sample 2

Instrument NO

Service

Description

Location

HV-VO6A

MET sample 2 vacuum valve

Whitey B-lI(54, o r equal

MET sample 2

HV-VO 7A

Equalizing l i n e s vacuum valve

Whitey B-lK54,

o r equal

Panel 6E

HV-W02A

O i l cooler water t h r o t t l i n g valve

Whitey B-1V54,

o r equal

Valve s t a t i o n

HV-W02B

O i l cooler w a t e r d r a i n valve

Whitey B-1K54, o r equal

Valve s t a t i o n

LE-1OA

Auxiliary tank low salt l e v e l

LE-1OB

Auxiliary tank medium s a l t level

LE-1OC

Auxiliary tank high salt level

LE-S15A

Fill-and-drain

tank low s a l t level

LE-S 15B

Fill-and-drain

tank high s a l t level

LI-1OA

Auxiliary tank low-level i n d i c a t o r

LI-1OB

Auxiliary tank medium-level i n d i c a t o r

LI-1oc

Auxiliary tank high-level

LI-S15A

Fill-and-drain indicator

tank low-salt-level

LI-S15B

Fill-and-drain indicator

tank high-salt-level

PA-S14A

Auxiliary tank low pressure alarm

Auxiliary tank

$. Fill-and-drain tank

J. 115-V p i l o t l i g h t , white l e n s

Panel 6C

indicator

Panel 7E

Tigerman 416 NCL-S2 annunciator

Panel 5A

a cn

Instrument

Service

Description

Location

PdC-H11A

Loop exhaust gas d i f f . p r e s s u r e control

Moore Products type 63SU-L

I n valve s t a t i o n

PE-HlS

MET sample s t a t i o n 3 vacuum

Hastings vacuum gage type DV-6M

MET s t a t i o n 3

PE-H17

MET sample s t a t i o n 1 vacuum

MET s t a t i o n 1

PE-Hlg

S a l t sample s t a t i o n 1 vacuum

S a l t station 1

PE-H2 3

MET sample s t a t i o n 2 vacuum

MET s t a t i o n 2

PE-VO1A

Vacuum pump i n l e t vacuum

Vacuum pump i n l e t

PI-A13A

A i r header p r e s s u r e

Norten-Ketay 3 1 / 2 in., o r equal

0-30 p s i g ,

Panel 7E

PI-14

D i g i t a l pressure indicator

Data Technology Corp. Model 412-03

Panel 5C

PI-HO1A

P u r i f i e d helium r e g u l a t e d p r e s s u r e

Ashcroft Cat. No. 1009A, o r equal

Helium b o t t l e station

PI-HO2A

H e l i u m p r e s s u r e from r e g u l a t e d source

Norten Ketay, o r equal; 3 1 / 2 in. diam, 0-30 p s i g

Panel 6E

PI-HO2B

H e l i u m p r e s s u r e t o ALPHA pump

Panel 6E

PI-Hl2A

H e l i u m p r e s s u r e t o gasket b u f f e r

Panel 6D

PI-H13A

Helium p r e s s u r e t o pump purge

Panel 6D

PI-Hl4A

H e l i u m p r e s s u r e t o sampling s t a t i o n

Panel 6E

Instrument

Service

Description

Location

PI-H14B

Helium b o t t l e supply pressure

I n t e g r a l with PV-H14A ( b o t t l e r e g u l a t o r )

Helium b o t t l e station

PI-H14C

H e l i u m b o t t l e regulated pressure I n t e g r a l w i t h PV-H14A ( b o t t l e r e g u l a t o r )

Helium bottle s t a t ion

PI-H15A

MET sample 3 pressure

2 1 / 2 in. diam, 30 in. Hg, 5 p s i compound MET sample 3 gage

PI-H17A

MET sample 1 pressure

MET sample 1

PI-H19A

S a l t sample 1 pressure

S a l t sample 1

PI-H2lA

S a l t sample 2 pressure

S a l t sample 2

PI-H23A

MET sample 2 p r e s s u r e

MET sample 2

P1-0 04A

O i l pump 2 discharge pressure

2 in. diam, 0-60 p s i g pressure gage

O i l pump stand

PI-005A

O i l pump 1 discharge pressure

2 i n . diam, 0-60 p s i g pressure gage

O i l pump stand

PI-VOlA

Vacuum system pressure

Ashcroft Duragage 0-30 in. Hg, o r equal

Panel 6E

PI-VO1B

Vacuum system pressure

Ashcroft Duragage 0-30 in. Hg, o r equal

Vacuum pump i n l e t

PM-EO1A

MET sample 3 pressure modifier

B e l l 6 Howell Model 18-112A-M31

I n s t r . cabinet 5

PM-E03A

MET sample 1 pressure modifier

Model 18-112A-M31

Instr. cabinet 5

PM-E-6A

MET sample 2 pressure modifier

Model 18-112A-M31

I n s t r . cabinet 5

PM-SUA

Auxiliary tank pressure modifier B e l l & Howell Model 18-112A-AA

I n s t r . cabinet 5

Instrument NO

Service

Description

Location

PM-S 14B

Auxiliary tank p r e s s u r e modifier

Foxboro Model 66GT-OW

I n s t r . cabinet 5

PM-S15A

Fill-and-drain

tank p r e s s u r e modifier

B e l l & H o w e l l Model 18-112A-AA

Instr. cabinet 5

PM-S15B

Fill-and-drain

tank pressure modifier

Foxboro Model 66GT-OW

Instr. cabinet 5

Foxboro 2-pen Model M-64

Panel 5C

PR-l5A,

Auxiliary tank and fill-and-drain s u r e recorder

pres-

PS-S14A

Auxiliary tank low p r e s s u r e switch

I n PM-S14A

I n s t r . cabinet 5

PS-008

Lubrication o i l r e t u r n l i n e pressure switch

Honeywell Model LR404H 10271, o r equal

Lubrication o i l stand

PSV-HO2A

ALPHA pump helium p r e s s u r e r e l i e f

Circle Seal model

I n s i d e encl.

PSV-H14A

Helium b o t t l e regulator relief

I n t e g r a l with PV-H14A

Helium b o t t l e s t a t ion

PSV-HUB

Sample s t a t i o n p r e s s u r e r e l i e f

Circle Seal model

I n s i d e encl.

PT-EO1A

MET sample 3 p r e s s u r e t r a n s m i t t e r

B e l l t Howell Model 4-402-0004

MET sample 3

PT-E03A

MET sample 1 p r e s s u r e t r a n s m i t t e r

MET sample 1

PT-EO 6A

MET sample 2 p r e s s u r e t r a n s m i t t e r

MET sample 2

PT-SUA

Auxiliary tank pressure t r a n s m i t t e r

B e l l t Howell Model 4-402-0004

Auxiliary tank

PT-S15A

Fill-and-drain mitter

B e l l t Howell Model 4-402-0004

Fill-and-drain tank

PV-A13A

A i r header p i l o t p r e s s u r e r e g u l a t o r

Fisher Controls type 67, o r equal

Panel 7E

tank pressure trans-

Instrument

No.

Service

Description

Location

PV-HO1A

P u r i f i e d helium p r e s s u r e r e g u l a t o r

F i s h e r Controls type 67, o r equal

Helium b o t t l e station

PV-H02A

Pump purge gas pressure r e g u l a t o r

F i s h e r Controls type 67, o r equal

Panel 6E

PV-H14A

H e l i u m b o t t l e pressure r e g u l a t o r

Dual-gage helium cylinder r e g u l a t o r

Helium b o t t l e s t a t ion

TCO-5

1 2 R h e a t e r 1 c o n t r o l operator

Hevi-duty 110 kVA s a t u r a b l e r e a c t o r

Electrical equipment

TCO-6

1 2 R h e a t e r 2 c o n t r o l operator

Hevi-duty 110 kVA s a t u r a b l e r e a c t o r

Electrical equipment

TIC-7

12R h e a t e r 1 temperature indicatorcontroller

Barber-Colman Model 292P

Panel 5B

TIC-8

1 2 R h e a t e r 2 temperature indicatorcontroller

Panel 5B

TIC-9

Cooler 2 temperature i n d i c a t o r - c o n t r o l l e r

Panel 6B

TI-17

Freeze valve SO6 temperature i n d i c a t o r

Panel 6B

TI-18

Freeze valve SO9 temperature i n d i c a t o r

Panel 7B

TI-19

Freeze valve SO2 temperature i n d i c a t o r

Panel 7B

TI-20

Miscellaneous temperature i n d i c a t o r

Doric S c i e n t i f i c Model DS-350

Panel 5C

TR-1

Miscellaneous temperature indicatorrecorder

Minneapolis-Honeywell Class 15 multipoint

Variac cabinet 1

TR-2

Miscellaneous teberature indicator recorder

Minneapolis-Honeywell Class 15 multipoint

Variac cabinet 2

TR-3

Variac cabinet 3

TR-4

Variac cabinet 4

TR-5

12R heater 1 temperature recorder

Leeds

TRC-6

12R heater 2 temperature recordercontroller

L&N Model H recorder-controller

Panel 8C

TS-7

12R heater 1 temperature limit switch

Integral with TIC-7

Panel 5B

TS-8

12R heater 2 temperature limit switch

Integral with TIC-8

Panel 5B

TS-9

Cooler 2 temperature limit switch

Integral with TIC-9

Panel 6B

TS-17A

Freeze valve SO6 temperature alarm switch

Integral with TI-17

Panel 6B

TS-18A

Freeze valve SO9 temperature alarm switch

Integral with "1-18

Panel 7B

TS-19A

Freeze valve SO2 temperature alarm switch

Integral with TI-19

Panel 7B

TS-20

Thermocouple selector switch

Lewis type 1154

Panel 5C

TS-20A

Thermocouple selector switch

Lewis type 10S20

Panel 5C

TS-20B

Thermocouple selector switch

Lewis type 10S20

Panel 5C

Northrup Model H recorder

Panel 8C

Instrument No.

Service

Description

Lo cat ion

TS-20C

Thermocouple s e l e c t o r switch

Lewis type 10S20

Panel 5C

TS-20D

Thermocouple s e l e c t o r switch

Lewis type 10S20

Panel 5 C

Appendix F

WELDING OF 2% Ti-MODIFIED HASTELLOY N

INTRA-LABORATORY CORRESPONDENCE OAK RIDGE NATIONAL LABORATORY

J u l y 1, 1975

To :

L. E. McNeese

Subject:

Welding of 2% Ti-Modified Hastelloy N

Standard Hastelloy N is a code-approved material, and welding procedures are i n common use a t ORNL f o r j o i n i n g t h i s material t o i t s e l f (WPS 1402) and f o r j o i n i n g Hastelloy N t o t h e 300-series s t a i n l e s s steels (WPS 2604). We have found i t necessary t o modify t h e chemical composition of t h i s a l l o y t o o b t a i n b e t t e r nuclear performance. One of t h e modified compositions contains 2% T i , and w e are using t h i s material i n t h e construction of two forced-circulation loops. Thus, w e must determine whether t h e modified a l l o y can be welded by t h e e x i s t i n g procedures o r whether new procedures must b e established. Three t e s t welds w e r e prepared by F r i z z e l l e t al. and t h e r e p o r t s are attached. The welds were:

1. modified Hastelloy N t o modified Hastelloy N with modified Hastelloy N w i r e, 2.

modified Hastelloy N t o standard Hastelloy N with modified Hastelloy N w i r e , and

modified Hastelloy N t o 300 s t a i n l e s s steel with 82T f i l l e r w i r e .

These welds w e r e made by t h e same parameters s p e c i f i e d i n WPS 1402 and WPS 2604. They w e r e q u i t e sound and passed a l l tests. The observations from t h e s e t h r e e w e l d a b i l i t y tests and t h e s i m i l a r i t y of t h e physical and mechanical p r o p e r t i e s of t h e 2% Ti-modified and standard Hastelloy N l e d t o t h e conclusion t h a t t h e 2% Ti-modified Hastelloy N i s equivalent t o t h e standard Hastelloy N described i n ASME Code Cases 1315 and 1345. Thus WPS 1402 can be used f o r any combination of standard and 2% T i modified Hastelloy N base and f i l l e r metals. Similarly, WPS 2604 can b e used t o j o i n t h e 2% Ti-modified a l l o y t o 300-series s t a i n l e s s steels. Welders already q u a l i f i e d on WPS 1402 and 2604 are q u a l i f i e d t o weld 2% Ti-modified Hastelloy N. Since t h e exact chemical modification of Hastelloy N t o b e used i n t h e f u t u r e has n o t been determined, we view t h e s t e p s taken h e r e as an i n t e r i m measure. When w e determine t h e f i n a l composition, we w i l l proceed t o e s t a b l i s h t h i s

95 L. E. McNeese

J u l y 1, 1975

. rat code-approved material with i t own welding procedures. a l l o y as a I n t h e meantime t h e e x i s t i n g procedures w i l l be used.

R. J r Beaver QAC-Materials

MFrn4-7 H. E. McCoy, Manager Molten S a l t Reactor Materials Program HEM: kd

Att. cc:

J. R. Engel, w/o a t t . I). R. F r i z z e l l , w / a t t . R. W. B. C. T. J. C.

H. Guymon, w/o a t t . R. Huntley, w/o a t t . McNabb, w/o a t t . A. Mills, w / a t t . K. Roche, w/o a t t . R. Weir, w / a t t . H. Wodtke, w/o a t t .

97 ORNL/TM-5540 Dist. Category UC-76 i

Internal Distribution â&#x20AC;&#x2122;

1. R. F. Apple 2. C. R. Brinkman 3. W. D. Burch 4. C. J. Claffey 5. W. E. Cooper 6. J. M. Corum 7. W. B. Cottrell 8. J. M. Dale 9. J. H. DeVan 10. J. R. Engel 11. G. G. Fee 12. D. E. Ferguson 13. L. M. Ferris 14. M. H. Fontana 15. A. P. Fraas 16. M. J. Goglia 17. G. W. Greene 18. A. G. Grindell 19. R. H. Guymon 20. W. 0. Harms 21. J. R. Hightower, Jr. 22. H. W. Hoffman 23-30. W. R. Huntley 31. P. R. Kasten

32. 33. 34. 35. 36. 37. 38-40.

41. 42. 43.

44. 45. 46. 47.

48. 49. 50. 51. 52. 53. 54. 55-56. 57. 58-60. 61.

J. R. Keiser A. D. Kelmers C. J. McHargue R. E. MacPherson W. J. McCarthy, Jr. H. E. McCoy L. E. McNeese R. L. Moore H. E. Robertson T. K. Roche W. E. Sallee Myrtleen Sheldon M. D. Silverman A. N. Smith I. Spiewak J. J. Taylor J. R. Weir G. D. Whitman W. J. Wilcox L. V. Wilson ORNL Patent Office Central Research Library Document Reference Section Laboratory Records Department Laboratory Records (RC)

External Distribution 62. Research and Technical Support Division, ERDA, OR0 63. Director, Reactor Division, ERDA, OR0 64-65. Director, Division of Nuclear Research and Applications, Energy Research and Development Administration, Washington, D.C. 20545 66-169. For distribution as shown in TID-4500 under UC-76, Molten-Salt Reactor Technology