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 22) are as follows.

No significant change was found with the chloride concentration analysis results compared to yesterday (May 21).

In addition, we would like to announce the results of all β analysis performed in the observation holes at 2 locations (2-10 and 2-11) which was newly drilled today (May 22), and reanalysis performed in the observation hole 2-12 where all β was detected yesterday (May 21). (There will be 6 newly added observation holes from 2-8 to 2-13.)

The all β densities detected in the observation hole 2-12 was equivalent to those announced yesterday.
The all β densities detected in the observation hole 2-10 and 2-11 were lower than those obtained in the observation hole 2-12.
- Underground reservoir observation hole 2-10: 1.0 × 10^-1Bq/cm³
- Underground reservoir observation hole 2-11: 3.3 × 10^-2Bq/cm³
- Underground reservoir observation hole 2-12 (remeasurement): 3.8 × 10^-1Bq/cm³

Analysis of the observation hole 2-8 and 2-13 and reanalysis of the observation hole 2-10 and 2-11 where all β was detected are scheduled tomorrow (May 23).

Please visit our web page for the sampling results.
http://www.tepco.co.jp/en/nu/fukushima-np/f1/smp/2013/images/chosui_13052203-e.pdf

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

 [Chloride concentration analysis results on May 22]

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 9:15 AM on May 22
Chloride concentration: 12ppm

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 9:32 AM on May 22
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 9:07 AM on May 22
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 9:22 AM on May 22
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 9:00 AM on May 22
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 9:00 AM on May 22
Chloride concentration: 4ppm

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 8:49 AM on May 22
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 8:50 AM on May 22
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 8:32 AM on May 22
Chloride concentration: 8ppm

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 8:21 AM on May 22
Chloride concentration: 9ppm

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 8:57 AM on May 22
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 8:39 AM on May 22
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 9:08 AM on May 22
Chloride concentration: 6ppm

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 9:16 AM on May 22
Chloride concentration: 9ppm

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:14 AM on May 22
Chloride concentration: 20ppm

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:15 AM on May 22
Chloride concentration: 6ppm

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:23 AM on May 22
Chloride concentration: 10ppm

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:27 AM on May 22
Chloride concentration: 13ppm

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 8:31 AM on May 22
Chloride concentration: 10ppm

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:36 AM on May 22
Chloride concentration: 10ppm

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 8:41 AM on May 22
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 8:50 AM on May 22
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.

(Chloride concentration results on May 21, 2013)
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- 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.