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 12) are as follows.

No significant change was found with the chloride concentration analysis results compared to yesterday (May 11).

As a result of sampling performed in the observation holes 2-5 and 2-6 around the underground reservoir No.2 and the geological survey hole (1) (analysis was performed for the first time) today (May 12), the all β densities were below the detection limit.

Please visit our web page for the sampling results.
http://www.tepco.co.jp/en/nu/fukushima-np/f1/smp/2013/images/chosui_13051202-e.pdf

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

[Chloride concentration analysis results on May 12]

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 9:46 AM on May 12
Chloride concentration: 11ppm

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 9:50 AM on May 12
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 9:34 AM on May 12
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 9:29 AM on May 12
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 9:23 AM on May 12
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 9:20 AM on May 12
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 9:13 AM on May 12
Chloride concentration: 11ppm

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 9:09 AM on May 12
Chloride concentration: 9ppm

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 8:40 AM on May 12
Chloride concentration: 8ppm

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

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

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 8:50 AM on May 12
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 9:20 AM on May 12
Chloride concentration: 7ppm

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 9:25 AM on May 12
Chloride concentration: 8ppm

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:28 AM on May 12
Chloride concentration: 40ppm

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:31 AM on May 12
Chloride concentration: 5ppm

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:43 AM on May 12
Chloride concentration: 12ppm

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:47 AM on May 12
Chloride concentration: 12ppm

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 8:52 AM on May 12
Chloride concentration: 10ppm

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:56 AM on May 12
Chloride concentration: 10ppm

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 9:06 AM on May 12
Chloride concentration: 8ppm

- 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 9:00 AM on May 12
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.