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 16) are as follows.

Yesterday (May 15), the chloride concentration in the leakage detection hole (northeast) of the underground reservoir No.1 showed a relatively high value (73ppm) compared to the day before yesterday (30ppm). However, the value today (37ppm) showed a decrease to the same level as the day before yesterday. 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 16]

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 9:45 AM on May 16
Chloride concentration: 12ppm

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 9:38 AM on May 16
Chloride concentration: 7ppm

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 9:34 AM on May 16
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 9:26 AM on May 16
Chloride concentration: 8ppm

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 9:26 AM on May 16
Chloride concentration: 9ppm
 
- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 9:15 AM on May 16
Chloride concentration: 6ppm

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 9:15 AM on May 16
Chloride concentration: 10ppm

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 8:58 AM on May 16
Chloride concentration: 9ppm

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 8:43AM on May 16
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 8:34 AM on May 16
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 9:05 AM on May 16
Chloride concentration: 9ppm

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 8:47 AM on May 16
Chloride concentration: 10ppm

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 9:18 AM on May 16
Chloride concentration: 7ppm

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 9:26 AM on May 16
Chloride concentration: 9ppm

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:29 AM on May 16
Chloride concentration: 37ppm

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:30 AM on May 16
Chloride concentration: 6ppm

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:47 AM on May 16
Chloride concentration: 11ppm

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:36 AM on May 16
Chloride concentration: 12ppm

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 8:55 AM on May 16
Chloride concentration: 12ppm

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:45 AM on May 16
Chloride concentration: 11ppm

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 9:07 AM on May 16
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 8:56 AM on May 16
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.