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 sampling performed in the underground reservoirs yesterday (May 7) are as follows.
- Drain holes of the underground reservoirs No.1-7
- Leakage detection holes of the underground reservoirs No.1-4 and 6
- Observation holes of the underground reservoirs (around reservoirs No.1-3): A1-A19
- Observation holes of the underground reservoirs (around reservoir No.6): B1-B3
- Groundwater bypass (investigation holes a-c, pump wells 1-4)

No significant change was found with the results compared to the day before yesterday (May 6).

The results of tritium sampling performed during the period from April 29 to May 1 (analysis is performed once a week) are as follows.
- Groundwater bypass (investigation holes a-c, pump wells 1-4)
- Observation holes on the sea side (1)-(8) (sampling performed in (5)-(8) for the first time)

Though tritium was detected in the observation holes (3) and (4) similarly to the previous analysis (April 22-24), no significant change was found with the results compared to the previous analysis.

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

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