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.
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 nuclides figures are to
be re-evaluated based on the improved measures for recurrence prevention
which have been prepared in accordance to a strong warning by NISA on
April 1st.
(previously announced)
On April 10th, 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 appendix, we informed NISA and the government of Fukushima
Prefecture of the results.
We planned to take samples at six points at 15 km offshore yesterday.
However, we canceled it due to the bad weather as we did on April 8th and
9th.. We will implement the sampling survey today and inform the result
tomorrow.
We will continuously conduct the same sampling surveys. 
attachment1: The result of the nuclide analysis of the seawater
(PDF 15.8KB)
attachment2: Radioactivity Density of Seawater(PDF 15.7KB)
attachment3: Radioactivity Density of Seawater at North of 1F 5 - 6
Discharge Channel(PDF 18.4KB)
