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. 

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 2 points each 5 and 30 km off the shore since May 27, and 1
point each 5, 15 and 30 km 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 September 15, 2011, we conducted sampling to evaluate the spread of
radioactive materials to the ocean which were detected at Fukushima
Daiichi Nuclear Power Station. As a result, no radioactive materials were
detected as shown in the attachment. 

Also, as we have been carrying out some construction of closing with steel
sheet pipes in the south of the water channel of Units 1 to 4, in order to
monitor the influence of the construction on the environment, we have
taken more samples around the south discharge canal.  

We informed NISA and the government of Fukushima Prefecture of the results
today. 

We will continuously conduct similar samplings. 

attachment1: Nuclide Analysis Results of Seawater (PDF 31.9KB) 
attachment2: Nuclide Analysis Results of Seawater <Offshore and Coast> 
                                                              (PDF 10.9KB) 
attachment3: Radioactivity Density of Seawater (PDF 42.0KB)