Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information regarding the water leak from the underground reservoirs at Fukushima Daiichi NPS.

Today (April 12), chloride concentration analysis was performed in the drain holes of the underground reservoirs No.1-7 (at 12 locations) and the leakage detection holes (samples could not be collected at 2 out of 10 locations) of the underground reservoirs No.1-4 and 6. The results are as follows.

No significant change in the chloride concentration was found with the results compared to the previous day (April 11).

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 5:10 AM on April 12
Chloride concentration: 14ppm

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 5:10 AM on April 12
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 5:20 AM on April 12
Chloride concentration: 12ppm

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 5:20 AM on April 12
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 5:30 AM on April 12
Chloride concentration: 7ppm

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 5:30 AM on April 12
Chloride concentration: 6ppm

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 5:50 AM on April 12
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 5:50 AM on April 12
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 6:30 AM on April 12
Chloride concentration: 8ppm

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 6:30 AM on April 12
Chloride concentration: 9ppm

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:20 AM on April 12
Chloride concentration: 13ppm

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 6:20 AM on April 12
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:10 AM on April 12
Chloride concentration: 7ppm

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 6:10 AM on April 12
Chloride concentration: 9ppm

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 9:00 AM on April 12
Chloride concentration: 1100ppm

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 9:20 AM on April 12
Chloride concentration: 7ppm

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 10:40 AM on April 12
Chloride concentration: 250ppm

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 9:40 AM on April 12
Chloride concentration: 10ppm

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 10:30 AM on April 12
Chloride concentration: 8ppm

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 10:05 AM on April 12
Chloride concentration: 270ppm

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 11:10 AM on April 12
Chloride concentration: 9ppm

- Leakage detection hole (southwest) of the underground reservoir No.4
*Sampling was not performed since the amount of sample necessary for analysis could not be obtained.

- Leakage detection hole (northeast) of the underground reservoir No.6
Sampling performed at 11:15 AM on April 12
Chloride concentration: 6ppm

- Leakage detection hole (southwest) of the underground reservoir No.6
*Sampling was not performed since the amount of sample necessary for analysis could not be obtained.

The water level, etc. of the underground reservoirs will continue to be intensively monitored.