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 16 (all β and tritium) and on September 17 (all β) in the 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, E-4: In east of the tank No.5 in Group I in the H4 area (East side of the tank with the drainage channel B between) where water leakage was found) around the H4 tank area.

The result of tritium obtained in E-1 (95,000Bq/L) has decreased compared with the result obtained on September 15 (140,000Bq/L).
In addition, the result of tritium obtained this time in E-4 was higher than the result obtained on September 15 (below the detection limit value (detection limit value: 120 Bq/L)), so we will continue monitoring.

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

<Observation hole: E-1>
- Sampled on September 17
All β: 360 Bq/L

- Sampled on September 16
Tritium: 95,000 Bq/L
All β: 560 Bq/L

- Sampled on September 15
Tritium: 140,000 Bq/L (previously announced)
All β: 1,100 Bq/L (previously announced)

- Sampled on September 14
Tritium: 170,000 Bq/L (previously announced)
All β: 1,100 Bq/L (previously announced)

- Sampled on September 13
Tritium: 150,000 Bq/L (previously announced)
All β: 1,300 Bq/L (previously announced)

- Sampled on September 12
Tritium: 130,000 Bq/L (previously announced)
All β: 1,600 Bq/L (previously announced)

- Sampled on September 11
Tritium: 97,000 Bq/L (previously announced)
All β: 1,500 Bq/L (previously announced)

- Sampled on September 10
Tritium: 64,000 Bq/L (previously announced)
All β: 2,000 Bq/L (previously announced)

<Observation hole: E-2>
- Sampled on September 17
All β: 33 Bq/L

- Sampled on September 16
Tritium: 430 Bq/L
All β: 31 Bq/L

- Sampled on September 15
Tritium: 400 Bq/L (previously announced)
All β: 35 Bq/L (previously announced)

<Observation hole: E-4>
- Sampled on September 17
All β: 53 Bq/L

- Sampled on September 16
Tritium: 410 Bq/L
All β: 18 Bq/L

- Sampled on September 15
Tritium: Below the detection limit value (detection limit value: 120Bq/L)
(previously announced)
All β: 1,300 Bq/L (previously announced)