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 30, 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.
  
Due to severe weather condition, 1 sampling point off the coast was 
conducted out of planned sampling at 4 points off the coast and at 17 
points at the off shore.
 
Also, as a result of analyses of strontium in the seawater collected on 
May 9, 2011, strontium 89 and 90 were detected as described in the 
appendix, 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 17.7KB) 
attachment2: Radioactivity Density of Seawater(PDF 14.5KB)