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 8th, 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.
Yesterday's offshore sampling at 17 points was not conducted due to bad
weather.
We will continuously conduct the similar sampling surveys.
attachment1:Results of Nuclide Analysis of Seawater(PDF 59.5KB)
attachment2:Radioactivity Density of Seawater(PDF 83.8KB)