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 for Tritium in samples taken on July 12 from the newly installed groundwater observation hole No.1-3 (west of the groundwater observation hole No.1) and on July 11 from the groundwater observation holes No.2 and No.3 as we obtained those results today (on July 14).

The measured tritium radioactivity density in the groundwater observation hole No.1-3 was low compared to the density in the groundwater observation hole No.1 located nearby.

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

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.

<Groundwater observation hole No.1-3 (new)>
- Sampling on July 12: Tritium 290,000Bq/L

<Groundwater observation hole No.1>
- Sampling on July 8: Tritium 410,000Bq/L (previously announced)

For the past sampling results, please refer to the following page on our website: