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.

Today (on July 30), we obtained measurement results for the following substances in the following locations:
·Tritium 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 July 25)
·γ nuclides and all-β in the groundwater observation holes No.1, No.1-2, No.1-3, No.1-4, No.2, and No.2-1 (samples taken on July 29)
·γ nuclides and all-β in seawater inside the port (other than seawater in the Unit 1-4 water intake north side, seawater between the water intakes of Units 1 and 2 (near the surface and near the bottom), seawater at the port entrance, and seawater at the port entrance (east side and west side)) (samples taken on July 29)
·γ nuclides in the groundwater observation hole No.1-2 after filtering (a sample taken on July 29)

The measured all-β density in the groundwater observation hole No.2-1 was 380Bq/L and at about the same level as that in the groundwater observation hole No.2, showing an increase from the previous density, which was below the detection limit value.

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

<Groundwater observation hole No.2-1>
- Sampling on July 29:
All-β 380Bq/L
- Sampling on July 25:
All-β ND (17Bq/L) (previously announced)

<Groundwater observation hole No.2>
- Sampling on July 29:
All-β 400Bq/L
- Sampling on July 25:
All-β 330Bq/L (previously announced)

We are continuing to tackle this problem in such manners as to intensely bring forward implementation of contamination prevention measures such as foundation improvement work to the bank protection, and comprehensively 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.

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