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
evaluation results.
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.
(Previously announced)
On May 4th, 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. 
attachment1:Results of Nuclide Analysis of Seawater(PDF 20.0KB)
attachment2:Radioactivity Density of Seawater(PDF 10.7KB)
attachment3:Radioactivity Density of Seawater (coast)(PDF 44.5KB)
attachment4:Radioactivity Density of Seawater (off the coast)(PDF 68.4KB)
