Fukushima Daiichi NPS Prompt Report 2013

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

The results of chloride concentration analysis of the samples collected in the drain holes of the underground reservoirs No.1-7 (at 14 locations) and the leakage detection holes of the underground reservoirs No.1-4 and 6 (sampling could not be performed in 2 out of 10 locations) today (April 10) are as follows.

No significant change in the chloride concentration was found in the results compared to the previous day (April 9).

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 11:20 AM on April 10
Chloride concentration: 12ppm

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 11:20 AM on April 10
Chloride concentration: 6ppm

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 7:40 AM on April 10
Chloride concentration: 14ppm

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 7:50 AM on April 10
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 7:30 AM on April 10
Chloride concentration: 6ppm

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 7:10 AM on April 10
Chloride concentration: 4ppm

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 7:20 AM on April 10
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 7:05 AM on April 10
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 6:10 AM on April 10
Chloride concentration: 5ppm

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 6:20 AM on April 10
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:50 AM on April 10
Chloride concentration: 11ppm

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 7:00 AM on April 10
Chloride concentration: 6ppm

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:00 AM on April 10
Chloride concentration: 6ppm

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 5:50 AM on April 10
Chloride concentration: 10ppm

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 7:40 AM on April 10
Chloride concentration: 1100ppm

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:25 AM on April 10
Chloride concentration: 8ppm

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 9:15 AM on April 10
Chloride concentration: 300ppm

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 9:00 AM on April 10
Chloride concentration: 11ppm

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 9:25 AM on April 10
Chloride concentration: 2ppm

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 9:47 AM on April 10
Chloride concentration: 280ppm

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 10:00 AM on April 10
Chloride concentration: 11ppm

- 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 10:30 AM on April 10
Chloride concentration: 7ppm

- 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 of concern will continue to be intensively monitored.