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 performed in the drain holes of the underground reservoirs No.1-7 (14 locations) and the leakage detection holes of the underground reservoirs No.1-4 and 6 (sample could not be collected at 2 out of 10 locations) today (May 15) are as follows.

Though the chloride concentration in the leakage detection hole (northeast) of the underground reservoir No.1 has increased (from 30ppm to 73ppm) compared to yesterday (May 14), the value is within the fluctuation range. In other locations, no significant change was found with the results compared to yesterday.

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

[Chloride concentration analysis results on May 15]

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 10:15 AM on May 15
Chloride concentration: 11ppm

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 10:31 AM on May 15
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 9:56 AM on May 15
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 10:15 AM on May 15
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 9:38 AM on May 15
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 10:06 AM on May 15
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 10:21 AM on May 15
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 10:30 AM on May 15
Chloride concentration: 9ppm

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 9:04 AM on May 15
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 8:55 AM on May 15
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 9:28 AM on May 15
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 9:12 AM on May 15
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 9:40 AM on May 15
Chloride concentration: 7ppm

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 9:51 AM on May 15
Chloride concentration: 9ppm

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:46 AM on May 15
Chloride concentration: 73ppm

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:57 AM on May 15
Chloride concentration: 6ppm

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 9:04 AM on May 15
Chloride concentration: 11ppm

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 9:27 AM on May 15
Chloride concentration: 13ppm

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 9:24 AM on May 15
Chloride concentration: 12ppm

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 9:45 AM on May 15
Chloride concentration: 18ppm

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 10:05 AM on May 15
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 9:20 AM on May 15
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.