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-Taiheiyou-
Oki 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 July 26, 2011, we conducted sampling to evaluate the spread of 
radioactive materials to the ocean. As a result of nuclide analysis, no 
radioactive materials were detected as shown in the attachment.

Regarding 4 sampling points at coastal area and 11 sampling points at 
offshore area that were planned to be taken yesterday, we conducted 
sampling only at 4 points at coastal area and 6 points at offshore area 
due to bad weather. 

In addition, we analyzed seawater collected on July 11, 2011, and no 
plutonium was detected as shown in the attachment.

We will continuously conduct the similar sampling. 

attachment1: Nuclide Analysis Results of Seawater(PDF 14.8KB) 
attachment2: Analysis Results of Pu in Seawater at Fukushima Daiichi 
             Nuclear Power Station(PDF 8.13KB) 
attachment3: Radioactivity Density of Seawater(PDF 45.4KB)