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 9), as we have obtained measurement results for the γ nuclides and all-β in samples taken yesterday (on July 8) from the groundwater observation hole No.1-4 (a new hole located north of the groundwater observation hole No.1), and of seawater inside the port, and measurement results for tritium in samples taken on July 2-5 of seawater inside the port, we release those results.

As a result of the measurements, the γ nuclides and all-β in the groundwater observation hole No.1-4 were found at densities that are not high compared to those in the other groundwater observation holes.

No significant change was found with the other measurement results compared to the previous results.

Upon obtaining the measurement results for tritium in these locations, we will release them likewise.

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.1-4 (new)>
- Sampling on July 8:
Cesium-134 1.5Bq/L
Cesium-137 3.6Bq/L
All-β 330Bq/L

<Groundwater observation hole No.1>
- Sampling on July 8 (previously announced):
Cesium-134 ND (0.50Bq/L)
Cesium-137 ND (0.47Bq/L)
All-β 1,800Bq/L

<Groundwater observation hole No.1-1>
- Sampling on July 8 (previously announced):
Cesium-134 1.9Bq/L
Cesium-137 3.6Bq/L
All-β 4,400Bq/L

<Groundwater observation hole No.1-2>
- Sampling on July 8 (previously announced):
Cesium-134 9,000Bq/L
Cesium-137 18,000Bq/L
All-β 890,000Bq/L

<Groundwater observation hole No.2>
- Sampling on July 8 (previously announced):
Cesium-134 ND (0.49Bq/L)
Cesium-137 0.74Bq/L
All-β 1,700Bq/L

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