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 27, 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.
   
As for sampling points of off-coast locations, we added 30km and 
5km off-coast locations, four points in total from yesterday. 
Originally, sampling was planned at 16 sampling points of off-coast 
locations, including newly added four points; however, due to severe 
weather condition, sampling was conducted only at 9 points for yesterday.

We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater(PDF 58.5KB) 
attachment2: Radioactivity Density of Seawater(PDF 69.6KB)