On March 21st, 2011, a sampling survey, conducted as a part of monitoring 
of surrounding environment, detected radioactive materials in the seawater 
around the water discharge port (south) 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 Daiich Nuclear Power Station (twice a 
day at two points out of such four points since March 26th).

We have also informed NISA of the results of seawater sampling surveys 
which have been implemented since April 2nd at three different points 
within 15 km area of Fukushima Daiichi Nuclear Power Station. (Since April 
5th, sampling has been implemented at six different points, and since 
April 6th, it has been conducted twice a day at six different points.)

The data of detected three 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 15th, 2011, we conducted sampling surveys to evaluate the spread 
of radioactive materials 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.

We will continuously conduct the same sampling surveys. 

attachment1:Results of Nuclide Analysis of Seawater(PDF 24.1KB) 
 
attachment2:Radioactivity Density of Seawater(PDF 40.4KB)