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 (June 4) 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
- Underground bypass investigation holes a-c
- Underground bypass pumping well 1-4
- Observation holes on the sea side (1)-(4)

No significant change was found with the results compared to the previous results (underground bypass investigation holes a-c, underground bypass pumping well 1-4 and observation holes on the sea side (1)-(4): obtained on May 28, others: obtained on June 3).

The results of tritium sampling performed on May 27 and 28 (analysis performed once a week) are as follows.
- Underground bypass investigation holes a-c
- Underground bypass pumping well 1-4
- Observation holes on the sea side (1)-(8)

No significant change was found with the tritium analysis results compared to the previous results.

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.