Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information on the "water leak at a tank in the H4 area in Fukushima Daiichi Nuclear Power Station" found on August 19.

We performed the analyses of water sampled on September 9 and 10 in observation holes (E-1: in north of the tank No.5 in I Group in the H4 area (outside of a dike) where water leakage was found; E-2 in south of of the tank No.5 in I Group in the H4 area (outside of a dike) where water leakage was found) around H4 tank area. The results are as follows.

<Observation hole: E-1>
- Sampled on September 10
Tritium: 64000Bq/L
All β: 2000Bq/L

- Sampled on September 9
Tritium: 29000Bq/L
All β: 1900Bq/L (previously announced)

- Sampled on September 8
Tritium: 4200Bq/L (previously announced)
All β: 3200Bq/L (previously announced)

The results of tritium were 29000Bq/L (sampled on September 9) and 64000Bq/L (sampled on September 10) respectively, and these results are higher than the result (4200Bq/L) sampled on September 8. Based on the probability of influence on these results by leakage in H4 area tanks, we continue to analyze the nearby observation holes nearby and investigate the area of leakage.

<Observation hole: E-2>
- Sampled on September 10
Tritium: 350Bq/L
All β: 21Bq/L

- Sampled on September 9
Tritium: 350Bq/L
All β: 22Bq/L (previously announced)

- Sampled on September 8
Tritium: 290Bq/L (previously announced)
All β: 67Bq/L (previously announced)

The results of tritium obtained on September 9 and 10 are respectively 350bq/L, and these results are approximately the same as the result of tritium (290 Bq/L) sampled on September 8.

We are determined to continue analyses and monitor the situation.

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(Reference)
<Observation hole: E-2>
- Sampled on September 4
All β: 650Bq/L
Tritium: Below the detection limit value (detection limit value: 120Bq/L)
 
- Sampled on September 5
All β: 330Bq/L
Tritium: Below the detection limit value (detection limit value: 120Bq/L)

- Sampled on September 6
All β: 180Bq/L
Tritium: 190Bq/L

- Sampled on September 7
All β: 35Bq/L
Tritium: 300Bq/L