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 24), we obtained measurement results for the following substances in the following locations:
·Tritium in the groundwater observation hole No.3-1 (a sample taken on July 23)
·Tritium in seawater inside the port (seawater in the Unit 1-4 water intake north side and seawater between the water intakes of Units 1 and 2 (near the surface and near the bottom)) (samples taken on July 21), and γ nuclides and all-β in seawater in the same locations (samples taken on July 23)

The measured tritium density in water taken from the newly dug-up groundwater observation hole No.3-1 was 290Bq/L, which is low compared to the density in the nearby located groundwater observation hole No.3.

<Groundwater observation hole No.3-1> (new)
- Sampling on July 23: Tritium 290Bq/L

<Reference: Groundwater observation hole No.3> (previously announced)
- Sampling on July 18: Tritium 1,700Bq/L

With regards to the other measured densities, no significant change was found compared to the previous results.

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