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.

On September 8, we performed the analyses of γ nuclide and all β for the first time in an observation hole (E-1: in north of a dike of the tank No.5 in I Group in the H4 area with water leakage) around H4 tank area. The results are as follows.

<Observation hole: E-1>
- Sampled on September 8
Cesium-134: 2.5Bq/L
Cesium-137: 5.1bq/L
All β: 3200Bq/L

We performed the analysis of tritium (sampled on September 7) and the analyses of γ nuclide and all β (sampled on September 8) in water in an observation hole (E-2: in south of a dike of the tank No.5 in I Group in the H4 area with water leakage) around H4 tank area. The results are as follows.

<Observation hole: E-2>
- Sampled on September 7
Tritium: 300Bq/L

- Sampled on September 8
Cesium-134: 0.64Bq/L
Cesium-137: 0.74Bq/L
All β: 67Bq/L

The result of tritium in water sampled on September 7 this time was 300Bq/L, and has increased compared to the previous result sampled before at the same point (190Bq/L sampled on September 6).

The result of all β in water sampled on September 8 this time was 67Bq/L, and has increased compared to the previous result sampled before at the same point (35Bq/L sampled on September 7).

We are determined to continue analyses and to 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