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 tritium in water sampled yesterday (on September 12) in observation holes (E-1: in north of the tank No.5 in Group I in the H4 area (outside of a dike) where water leakage was found; E-2 in south of the tank No.5 in Group I in the H4 area (outside of a dike) where water leakage was found) around H4 tank area.

The result of tritium in E-1 has bee increasing since the day before, and was higher than the result obtained on September 11 (97000Bq/L).

Based on the possibility of influence on these results by leakage in H4 area tanks and leakage from the concentrated salt water transportation pipe treated with desalination apparatus (reverse osmosis membrane type) on March 26 and April 5 in 2012, we will continue to monitor the situation.

Regarding the result of tritium in E-2, the result has no remarkable change, compared with the result sampled on September 11.

<Observation hole: E-1>
- Sampled on September 12
Tritium: 130000Bq/L
All β: 1600 Bq/L (previously announced)

- Sampled on September 11
Tritium: 97000Bq/L (previously announced)
All β: 1500 Bq/L (previously announced)

- Sampled on September 10
Tritium: 64000Bq/L (previously announced)
All β: 2000 Bq/L (previously announced)

<Observation hole: E-2>
- Sampled on September 12
Tritium: 290Bq/L
All β: 29 Bq/L (previously announced)

- Sampled on September 11
Tritium: 300Bq/L (previously announced)
All β: Below the detection limit value (detection limit value: 20Bq/L) (previously announced)