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-Chihou-Taiheiyou-Oki 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 14th, 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.
Regarding seawater sampling surveys at six points at 15 km off the coast
of Fukushima Daiichi Nuclear Power Station conducted yesterday, only once
survey was conducted at two points out of such six points due to the bad
weather.
We will continuously conduct the same sampling surveys. 
attachment1:Results of Nuclide Analysis of Seawater(PDF 14.7KB)
attachment2:Radioactivity Density of Seawater(PDF 64.2KB)
