On March 21st, 2011, we conducted sampling surveys, 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 22nd, 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 26th).  

Since April 17, we have also conducted sampling surveys at four points, 
3 km off the shore of Fukushima Daiichi Nuclear Power Station, two points, 
8 km off the shore of the Power Station and 6 points, 15 km off the shore 
of the Power Station and informed them of evaluation results.

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 based on the improved measures for recurrence prevention 
which have been prepared in accordance to a warning from NISA on April 1st.  
                                                    (Previously announced)

On April 24th, 2011, we conducted sampling surveys 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 exhibit, we informed NISA and the government of 
Fukushima Prefecture of the results.

Due to bad weather condition, the sampling survey at 12 points was not 
conducted yesterday.

We will continuously conduct the same sampling surveys. 

 
attachment1:Results of Nuclide Analysis of Seawater(PDF 10.6KB) 
attachment2:Radioactivity Density of Seawater(PDF 10.0KB) 
attachment3:Radioactivity Density of Seawater (coast)(PDF 45.2KB)