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.

With regards to water pumped up from well points, we conducted sampling for the first time on August 19 to analyze the water. We would like to announce measurement results of the γ nuclide, all-β and tritium densities in the water, as we obtained the results.

<Water pumped up from well points> (new)
- Sampling on August 19:
Cesium-134 1.5Bq/L
Cesium-137 3.4Bq/L
Ruthenium-106 17Bq/L
All-β 190,000Bq/L
Tritium 460,000Bq/L

(Reference: Measurement results from locations around the groundwater observation hole No.1)
<Groundwater observation hole No.1> (previously announced)
- Sampling on August 19:
Cesium-134 3.2Bq/L
Cesium-137 4.3Bq/L
All-β 1,500Bq/L
- Sampling on August 15:
Tritium 370,000Bq/L

<Groundwater observation hole No.1-2> (previously announced)
- Sampling on August 19:
Cesium-134 880Bq/L
Cesium-137 1,900Bq/L
All-β 870,000Bq/L
- Sampling on August 15:
Tritium 300,000Bq/L

<Groundwater observation hole No.1-3> (previously announced)
- Sampling on August 19:
Cesium-134 ND (0.56Bq/L)
Cesium-137 ND (0.65Bq/L)
All-β 120,000Bq/L
- Sampling on August 15:
Tritium 190,000Bq/L

<Groundwater observation hole No.1-4> (previously announced)
- Sampling on August 19:
Cesium-134 1.1Bq/L
Cesium-137 2.1Bq/L
All-β 380Bq/L
- Sampling on August 15:
Tritium 76,000Bq/L

<Groundwater observation hole No.1-5> (previously announced)
- Sampling on August 19:
Cesium-134 130Bq/L
Cesium-137 260Bq/L
All-β 13,000Bq/L
- Sampling on August 15:
Tritium 72,000Bq/L

<Groundwater observation hole No.1-8> (previously announced)
- Sampling on August 20:
Cesium-134 21Bq/L
Cesium-137 45Bq/L
All-β 1,100Bq/L

* ND indicates a case where the result is below the detection limit value. The detection limit value is shown in the parentheses.

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