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 7, 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 not detected 
as shown in the attachment. 

We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater (PDF 18.9KB) 
attachment2: Radioactivity Density of Seawater (PDF 37.9KB)