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 May 24 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.

We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater(PDF 15.1KB) 
attachment2: Radioactivity Density of Seawater(PDF 53.7KB)