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 announce a measurement result of the tritium density in water sampled yesterday (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 result.

The result obtained this time is low compared to that obtained from the groundwater observation hole No.1 located nearby.

<Groundwater observation hole No.1-8>
- Sampling on August 20:
Cesium-134 21Bq/L (previously announced)
Cesium-137 45Bq/L (previously announced)
All-β 1,100Bq/L (previously announced)
Tritium 950Bq/L (new)

(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

* 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