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 26), we obtained measurement results for the following substances in the following locations:
·Tritium in the newly installed groundwater observation hole No.2-1 (a sample taken on July 25)
·Tritium in the groundwater observation holes No.1, No.1-2, No.1-3, No.1-4, No.2 and No.3 (samples taken on July 22)
·γ nuclides and all-β in the groundwater observation holes No.1, No.1-2, No.1-3, No.1-4, No.2, No.3 and No.3-1(samples taken on July 25)
·Tritium in seawater inside the port (samples taken on July 22 and 23)
·γ nuclides and all-β in 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 25), which are included in seawater inside the port, and γ nuclides in the groundwater observation hole No.1-2 after filtering (a sample taken on July 25)

The measured tritium radioactivity density in the groundwater observation hole No.2-1 was lower than that in the groundwater observation hole No.2.

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

<Groundwater observation hole No.2-1> (new)
- Sampling on July 25:
Tritium 120Bq/L

<Groundwater observation hole No.2>
- Sampling on July 22:
Tritium 710Bq/L
- Sampling on July 18:
Tritium 540Bq/L (previously announced)

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