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 tritium density in water sampled on August 8 and the γ nuclide, all-β and tritium densities in water sampled on August 10 from the newly installed groundwater observation hole No.0-1 (east of Unit 1 Turbine Building), as we obtained the results.

The tritium density obtained in the second measurement on water sampled on August 8 was the same as the previously measured density. With regards to the measurement results on water sampled on August 10, the tritium density was 34,000Bq/L (up from the previous value 23,000Bq/L) while the γ nuclide and all-β densities showed no significant changes compared to the previous measurement (on water sampled on August 8).

<Groundwater observation hole No.0-1>
- Sampling on August 8 (the second measurement):
Tritium 23,000Bq/L
- Sampling on August 10:
Cesium-134 0.66Bq/L
Cesium-137 1.2Bq/L
All-β 290Bq/L
Tritium 34,000Bq/L

[Reference (previously announced on August 8 and 9)]
- Sampling on August 8 (the first measurement):
Cesium-134 0.61Bq/L
Cesium-137 1.6Bq/L
All-β 210Bq/L
Tritium 23,000Bq/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