Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information regarding the water leak from the underground reservoirs at Fukushima Daiichi NPS since April 5, 2013.

As for result of all β sampled at the drain hole (northeast side) of the underground reservoir No.3, the amount was 6.3 x 10^-2 Bq/cm³ on August 12 and has been increased since August 13. Since there is a possibility that this increase is a fluctuation in the measurement value, we have been checking transition of data. However, we have judged that the result is on the upward trend since the amount obtained today (on August 17) was 6.6 x 10^-1 Bq/cm³.

Transition of the analysis results and the water level, etc. of the underground reservoirs will continue to be intensively monitored.

No significant change was found on the other analysis results compared to the previous results.

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<Analysis results of the drain hole on the northeast side of the underground reservoir No.3 (all β)>
August 12: 6.3 x 10^-2 Bq/cm³
August 13: 4.3 x 10^-1 Bq/cm³
August 14: 5.3 x 10^-1 Bq/cm³
August 15: 5.6 x 10^-1 Bq/cm³
August 16: 5.5 x 10^-1 Bq/cm³
August 17: 6.6 x 10^-1 Bq/cm³
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