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 measurement results for cesium, all-β, etc. in water sampled yesterday (on September 2) from the groundwater observation holes east of Units 1-4 Turbine Buildings, as we obtained the results.

As a result of the measurement this time, cesium-134 and cesium-137 increased to 10Bq/L (the previous result: 1.3Bq/L) and 24Bq/L (the previous result: 3.3Bq/L) at the groundwater observation hole No.1-3. All-β at the well point also increased to 360,000Bq/L [the previous result: 6,000Bq/L (the result before the previous result: 190,000Bq/L)].

With regards to the cause, it is assumed that highly-concentrated cesium and all-β flowed from the groundwater observation hole No.1-2 etc. into the groundwater observation hole No.1-3 because the area around and groundwater observation hole No.1 are being gradually closed by the water glass and because water is pumped out from the well point.

The results at the newly dug-up groundwater observation hole No.0-2 and at the groundwater observation hole No.0-1 were almost the same.

We continue to strengthen the oversight of the situation, following the results of the additional borings surveys and the results of the sea water within the harbor. In addition, we are committed to making further progress in the effort to continuing the ground improvement work, and from this time forward, we make best efforts to prevent spread of contamination such as transferring the contaminated water inside the water intake power cable trench or the closure of the trench, and cleansing the contaminated water in the seawater pipe trench.

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