On March 21, 2011, we conducted sampling, as a part of monitoring of 
surrounding environments, and detected radioactive materials in the 
seawater around the water discharge canal (of the south side) of 
Fukushima Daiichi Nuclear Power Station, which was damaged by the 
Tohoku-Taiheiyou-Oki Earthquake. Therefore, we informed Nuclear and 
Industrial Safety Agency (NISA) and the government of Fukushima 
Prefecture of the results. 
Since March 22, we have conducted seawater sampling surveys at four 
points off the shore of Fukushima Daiichi Nuclear Power Station 
(twice a day at two points out of such four points since March 26).

Since April 17, we have also conducted sampling surveys at four points 
(2 points have been added since April 26, another 3 points since April 
30, and another 1 point since May 5, 10 points in total) of 3 km off 
the shore of Fukushima Daiichi Nuclear Power Station, two points of 8 
km off the shore of the Power Station and 6 points of 15 km off the 
shore of the Power Station and informed them of evaluation results.
Also, we added another 4 points off the shore since May 27 and 3 points 
off the shore since June 2.

The data of three detected nuclides (Iodine-131, Cesium-134 and Cesium-137) 
will be reported as fixed data. Other nuclide figures are to be 
re-evaluated. 
                                                     (Previously announced)

On August 9, 2011, we conducted sampling to evaluate the spread of 
radioactive materials to the ocean which were detected at Fukushima 
Daiichi Nuclear Power Station. As a result, radioactive materials were 
detected as shown in the attachment.

Yesterday, we implemented closure work using steel pile sheet piles at 
the southern side of intake channel's open conduits of Unit 1 to 4. In 
order to monitor its influence to the circumstances due to the work, we 
have increased the sampling around the southern discharge channel in 
frequency.

We informed NISA and the government of Fukushima Prefecture of the results 
today. We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater (PDF 72.0KB) 
attachment2: Radioactivity Density of Seawater (PDF 41.0KB)