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 17th, we have also conducted sampling surveys at four points
(2 points are added since April 26, another 3 points from April 30th, total
of 9 points) of 3 km off the shore of Fukushima Daiichi Nuclear Power
Station, two points of 8 km off the shore of the Power Station and 6 points
of 15 km off the shore of the Power Station and informed them of
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.
On May 3rd, 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 attachment, we informed NISA and the government of Fukushima
Prefecture of the results.
We will continuously conduct the similar sampling surveys.
Appendix1:Results of Nuclide Analysis of Seawater (PDF 58.5KB)
Appendix2:Radioactive Density of Seawater (PDF 91.8KB)