Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information on disconnection of a silt fence at a water intake for Unit 5 and 6 at Fukushima Daiichi NPS.

We would like to announce measurement results of sampling analyses of all-β performed in inner area of port, on the basis of the disconnection of the silt fence^* installed near the water intake for Unit 5 and 6.

<North of Unit 5-6 discharge channel>
-Sampled on September 26
All-β: Below the detection limit value (the detection limit value: 19Bq/L)

<In front of Unit 6 water intake canal>
-Sampled on September 26
All-β: Below the detection limit value (the detection limit value: 19Bq/L)

(Reference: Fluctuating range in the past 6 months)
- North of Unit 5-6 discharge channel
All-β: All below the detection limit value

- In front of Unit 6 intake canal
All-β: From below the detection limit value to 46Bq/L (analyses continued since June 25)

*The silt fence near the water intake for Unit 5 and 6 was installed for the purpose of preventing undersea sand in inner port area from flowing into the water intake for Unit 5 and 6 when water is taken into.

The measurement results of all-β obtained at the North of Unit 5-6 discharge channel and in front of Unit 6 intake canal are below the detection limit value. No influence by the disconnection of silt fence was found.

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