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 5), as we have obtained measurement results for the γ nuclides and all-β from sampling performed today (on July 5) in water of the groundwater observation hole No.1-1 and the groundwater observation hole No.1-2 (a new hole installed completely on July 3, on the south side to the groundwater observation hole No.1) and in seawater inside the port, we release the results.

As a result of the measurement for the γ nuclides and all-β in the groundwater observation hole No.1-2 (on the south side to the groundwater observation hole No.1), high γ nuclide and all-β densities were detected compared to those in the groundwater observation holes No.1 and No.1-1.

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.1-1>
- Sampling on July 5:
Cesium-134 ND (0.42Bq/L)
Cesium-137 0.55Bq/L
All-β  3,800Bq/L
- Sampling on July 1 (previously announced):
Cesium-134 ND (0.44Bq/L)
Cesium-137 0.98Bq/L
All-β  4,300Bq/L

<(New) Groundwater observation hole No.1-2>
- Sampling on July 5:
Cesium-134 99Bq/L
Cesium-137 210Bq/L
All-β  900,000Bq/L

<Seawater in the water intake north side>
- Sampling on July 5:
Cesium-134 6.3Bq/L
Cesium-137 17Bq/L
All-β  130Bq/L
- Sampling on July 3 (previously announced):
Cesium-134 13Bq/L
Cesium-137 23Bq/L
All-β  310Bq/L

<Seawater between the water intakes of Units 1 and 2 (near the surface)>
- Sampling on July 5:
Cesium-134 5.6Bq/L
Cesium-137 12Bq/L
All-β  150Bq/L
- Sampling on July 3 (previously announced):
Cesium-134 5.3Bq/L
Cesium-137 9.3Bq/L
All-β  130Bq/L

<Seawater between the water intakes of Units 1 and 2 (near the bottom)>
- Sampling on July 5:
Cesium-134 6.8Bq/L
Cesium-137 14Bq/L
All-β  180Bq/L
- Sampling on July 3 (previously announced):
Cesium-134 3.0Bq/L
Cesium-137 8.9Bq/L
All-β  120Bq/L