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 - Pacific 
Ocean 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, 9 
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 (Regarding 6 points out of 9 points of 3km off the shore, from May 
9, we conduct sampling at the lower layer in addition to upper layer. We 
conduct sampling for those 6 points twice a week).

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 June 2, 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.

While we planned to conduct sampling survey at 25 points off the shore of 
the stations with 3 new additional points, due to severe weather condition,
sampling was conducted at 18 points off the shore.

We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater(PDF 24.3KB) 
attachment2: Radioactivity Density of Seawater(PDF 71.3KB)