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 for γ nuclides and all-β in a sample taken on July 12 from the newly installed groundwater observation hole No.1-3 (west of the groundwater observation hole No.1) as we have obtained the results.

The measured all-β radioactivity density in the groundwater observation hole No.1-3 was about one tenths of the density in the sample taken on July 11 from the groundwater observation hole No.1-2 (south of the groundwater observation hole No.1) located nearby.

The measured radioactivity densities of the γ nuclides in the groundwater observation hole No.1-3 were also low compared to those in the sample taken on July 11 from the groundwater observation hole No.1-2.

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.

<Groundwater observation hole No.3 (new)>
- Sampling on July 12:
Cesium-134 ND (0.66Bq/L)
Cesium-137 1.4Bq/L
All-β 92,000Bq/L

<Groundwater observation hole No.1-2> (previously announced)
- Sampling on July 11:
Cesium-134 8,200Bq/L
Cesium-137 17,000Bq/L
All-β 890,000Bq/L

For the past sampling results, please refer to the following page on our website: