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 γ nuclide and all-β densities in water sampled today (on August 20) from the newly installed groundwater observation hole No.1-8 (located approx. 18m east of the groundwater observation hole No.1, approx. 2m west of the ground improvement area, and approx. 7m from the bank protection), as we obtained the results.

The results obtained this time are at the same levels as those obtained from the groundwater observation hole No.1 located nearby.

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

(Reference: Measurement results from locations around the groundwater observation hole No.1)
<Groundwater observation hole No.1> (previously announced)
- Sampling on August 15:
Cesium-134 ND (0.54Bq/L)
Cesium-137 ND (0.49Bq/L)
All-β 1,700Bq/L
<Groundwater observation hole No.1-2> (previously announced)
- Sampling on August 15:
Cesium-134 150Bq/L
Cesium-137 360Bq/L
All-β 880,000Bq/L
<Groundwater observation hole No.1-3> (previously announced)
- Sampling on August 15:
Cesium-134 ND (0.64Bq/L)
Cesium-137 ND (0.76Bq/L)
All-β 160,000Bq/L
<Groundwater observation hole No.1-4> (previously announced)
- Sampling on August 15:
Cesium-134 ND (0.47Bq/L)
Cesium-137 1.2Bq/L
All-β 220Bq/L
<Groundwater observation hole No.1-5> (previously announced)
- Sampling on August 15:
Cesium-134 150Bq/L
Cesium-137 320Bq/L
All-β 21,000Bq/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