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, 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 June 13, 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 14 points off shore 
yesterday, due to severe weather condition, sampling was conducted 
at 9 points. 

We will continuously conduct the similar sampling.  

 
attachment1: Results of Nuclide Analysis of Seawater(PDF 64.2KB) 
attachment2: Radioactivity Density of Seawater(PDF 92.9KB)