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 9th, 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 the day before yesterday.
Since the bad weather still continues today, sampling has also been
canceled.
We will continuously conduct the same sampling surveys 
Appendix1:Results of Nuclide Analysis of Seawater <Shore>(PDF 12.6KB)
Appendix2:Radioactivity Density of Seawater(Bq/cm3)(PDF 10.7KB)
Appendix3:Radioactivity Density of Seawater at North of 1F 5 - 6 Discharge
Channel(approx. 30 m north of 5-6u discharge channel)(Bq/cm3)
(PDF 20.4KB)
