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Press Release (Apr 19,2011) Detection of Radioactive Material from Subsurface Water near the Turbine Building of Fukushima Daiichi Nuclear Power Station
On March 28th 2011, we were advised from Nuclear Safety Commission of Japan to enhance the sampling survey regarding water in underground floor of the turbine building of Fukushima Daiichi Nuclear Power Station. In order to verify any leakages to underground and sea, and safety, we have been implementing the sampling survey of subsurface water and seawater. Regarding sampling survey of sub-drain, based on the instruction from NISA on April 14th, we continue to conduct same kind of sampling survey three times a week, and inform the result on the next day of the survey. (Previously announced) On April 18th 2011, we had conducted sampling survey regarding subdrain (subsurface water obtained and managed in the site) near the turbine building of Fukushima Daiichi Nuclear Power Station. Today, we had informed the result to Nuclear and Industrial Safety Agency (NISA) and the government of Fukushima Prefecture, because radioactive materials were detected as shown in the attachment.
Appendix : Fukushima Daiichi Nuclear Power Station : Results of Nuclide Analysis of sub-drain (PDF 10.2KB) Reference : Fukushima Daiichi Nuclear Power Station : Radioactivity Density (PDF 41.8KB)
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Fukushima Daiich Nuclear Power Station : Radioactivity Density of Sub-drain of Unit 1（Ｂｑ／ｃｍ３） 1.0E+03 I-131 Cs-134 Cs-137 1.0E+02
1.0E+01
1.0E+00
1.0E-01
1.0E-02
1.0E-03 4/5
4/6
4/7
4/8
4/9
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Fukushima Daiich Nuclear Power Station : Radioactivity Density of Sub-drain of Unit 2（Ｂｑ／ｃｍ３） 1.0E+03 I-131 Cs-134 Cs-137 1.0E+02
1.0E+01
1.0E+00
1.0E-01
1.0E-02
1.0E-03 4/5
4/6
4/7
4/8
4/9
4/10
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4/14
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Fukushima Daiich Nuclear Power Station : Radioactivity Density of Sub-drain of Unit 3（Ｂｑ／ｃｍ３） 1.0E+03 I-131 Cs-134 Cs-137 1.0E+02
1.0E+01
1.0E+00
1.0E-01
1.0E-02
1.0E-03 4/5
4/6
4/7
4/8
4/9
4/10
4/11
4/12
4/13
4/14
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Fukushima Daiich Nuclear Power Station : Radioactivity Density of Sub-drain of Unit 4（Ｂｑ／ｃｍ３） 1.0E+03 I-131 Cs-134 Cs-137 1.0E+02
1.0E+01
1.0E+00
1.0E-01
1.0E-02
1.0E-03 4/5
4/6
4/7
4/8
4/9
4/10
4/11
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4/14
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Fukushima Daiich Nuclear Power Station : Radioactivity Density of Sub-drain of Unit 5（Ｂｑ／ｃｍ３） 1.0E+03 I-131 Cs-134 Cs-137 1.0E+02
1.0E+01
1.0E+00
1.0E-01
1.0E-02
1.0E-03 4/5
4/6
4/7
4/8
4/9
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Fukushima Daiich Nuclear Power Station : Radioactivity Density of Sub-drain of Unit 6（Ｂｑ／ｃｍ３） 1.0E+03 I-131 Cs-134 Cs-137 1.0E+02
1.0E+01
1.0E+00
1.0E-01
1.0E-02
1.0E-03 4/5
4/6
4/7
4/8
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Fukushima Daiich Nuclear Power Station : Radioactivity Density of the deep well at the site（Ｂｑ／ｃｍ３）
1.0E+03 I-131 Cs-134 Cs-137 1.0E+02
1.0E+01
1.0E+00
1.0E-01
1.0E-02
April 13th No detection
1.0E-03 4/5
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