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.

We would like to make an announcement on measurement results of the γ nuclide and all-β densities on a sample taken today (on July 31) from the newly installed groundwater observation hole No.1-5 (west of the groundwater observation hole No.1-3), as we obtained the results.

<Groundwater observation hole No.1-5> (new)
- Sampling on July 31:
Cesium-134 21Bq/L
Cesium-137 44Bq/L
All-β 1,200Bq/L

(Reference: Measured densities in nearby locations around the groundwater observation hole No.1)
<Groundwater observation hole No.1> (previously announced)
- Sampling on July 29:
Cesium-134 ND (0.46Bq/L)
Cesium-137 ND (0.51Bq/L)
All-β 1,300Bq/L

<Groundwater observation hole No.1-2> (previously announced)
- Sampling on July 29:
Cesium-134 1,300Bq/L
Cesium-137 2,700Bq/L
All-β 870,000Bq/L

<Groundwater observation hole No.1-3> (previously announced)
- Sampling on July 29:
Cesium-134 ND (0.44Bq/L)
Cesium-137 ND (0.47Bq/L)
All-β 150,000Bq/L

<Groundwater observation hole No.1-4> (previously announced)
- Sampling on July 29:
Cesium-134 0.48Bq/L
Cesium-137 1.1Bq/L)
All-β 78Bq/L

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