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 25), we obtained measurement results for the following substances in the following locations:
· γ nuclides and all-β in the groundwater observation hole No.2-1 (a sample taken on July 25)

The measured γ nuclide and all-β radioactivity densities in the groundwater observation hole No.2-1 were at the same level as or lower than those in the groundwater observation hole No.2.

<Groundwater observation hole No.2-1> (new)
- Sampling on July 25:
Cesium-134 ND (0.42Bq/L)
Cesium-137 0.69Bq/L
All-β ND (17Bq/L)

<Groundwater observation hole No.2> (previously announced)
- Sampling on July 22:
Cesium-134 ND (0.44Bq/L)
Cesium-137 ND (0.53Bq/L)
All-β 430Bq/L
- Sampling on July 18:
Cesium-134 ND (0.36Bq/L)
Cesium-137 0.50Bq/L
All-β 1,100Bq/L

* ND indicates a case where the result is below the detection limit value. The detection limit value is shown in the parentheses.

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