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 July 3, 2011, we conducted sampling to evaluate the spread of 
radioactive materials to the ocean which were detected at Fukushima Daiichi
Nuclear Power Station. Since the radioactive materials were detected as 
shown in the attachment, today, we informed NISA and the government of 
Fukushima Prefecture of the results.
 
Sampling scheduled to be conducted yesterday at 5 points off the shore was 
suspended due to the bad weather.
 
We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater(PDF 10.0KB) 
attachment2: Radioactivity Density of Seawater(PDF 27.6KB)