Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information on the latest situation concerning the detection of high densities of Tritium and Strontium in the observation hole at the east side of the Unit 1-4 Turbine Buildings of Fukushima Daiichi NPS.

On August 1, we obtained measurement results for the following substances in the following locations:
·γ nuclides and all-β in the groundwater observation holes No.1, No.1-2, No.1-3, No.1-4, No.2, No.3, and No.3-1 (samples taken on August 1)

The measured all-β density in the groundwater observation hole No.3-1, which was below the detection limit value at the previous time, was 180Bq/L.

With regards to the other measured densities, no significant change was found compared to the previous densities.

<Groundwater observation hole No.3-1>
- Sampling on August 1:
All-β 180Bq/L
(Reference: Sampling at the previous time)
- Sampling on July 25:
All-β ND (18Bq/L) (previously announced)

We are continuing to intensify the monitoring by using the results of additional boring to drill additional locations, and the analyses results on seawater at such locations as the port interior and the water outlets. In addition, we are continuing to tackle this problem in such manners as to intensely bring forward implementation of contamination prevention measures such as transferring and blocking of the contaminated water inside the water intake power cable trench, purification of the contaminated water inside the seawater piping trench, as well as foundation improvement work to the bank protection.

For the past sampling results, please refer to the following page on our website:
http://www.tepco.co.jp/en/nu/fukushima-np/f1/smp/index-e.html