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 21) are as follows.

No significant change was found with the chloride concentration analysis results compared to yesterday (May 20).

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

[Chloride concentration analysis results on May 21]

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 9:06 AM on May 21
Chloride concentration: 12ppm

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 8:59 AM on May 21
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 8:59 AM on May 21
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 8:51 AM on May 21
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 8:53 AM on May 21
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 8:44 AM on May 21
Chloride concentration: 6ppm

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 8:42 AM on May 21
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 8:35 AM on May 21
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 8:27 AM on May 21
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 8:20 AM on May 21
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 8:43 AM on May 21
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 8:31 AM on May 21
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 8:49 AM on May 21
Chloride concentration: 7ppm

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 8:55 AM on May 21
Chloride concentration: 8ppm

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:10 AM on May 21
Chloride concentration: 20ppm

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:11 AM on May 21
Chloride concentration: 6ppm

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:18 AM on May 21
Chloride concentration: 10ppm

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:19 AM on May 21
Chloride concentration: 13ppm

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 8:25 AM on May 21
Chloride concentration: 10ppm

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:26 AM on May 21
Chloride concentration: 10ppm

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 8:35 AM on May 21
Chloride concentration: 10ppm

- 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 8:38 AM on May 21
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.