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)

We conducted an analysis about plutonium and Strontium in the sea water 
which was collected on August 15, as a result Strontium 89 and 90 has been 
detected as described in the appendix.

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

We will continuously conduct the similar sampling. 

Appendix1: Fukushima Daiichi Nuclear Power Station  Analysis Result of 
           Plutonium in the Sea Water (PDF 7.88KB) 
Appendix2: Nuclide Analysis Results of Seawater <Coast and Offshore> (PDF 11.2KB)