On March 21, 2011, we conducted sampling, 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 22, 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 26).
Since April 17, we have also conducted sampling surveys at four points
(2 points have been added since April 26, another 3 points since April 30,
9 points in total) 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 (Regarding 6 points in 9 points of 3km off the shore, from May 9,
we conduct sampling at the lower layer in addition to upper layer. We
conduct sampling for those 6 points twice a week).
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. (Previously announced)
On May 23 2011, we conducted sampling 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, today, we informed NISA and the government of Fukushima
Prefecture of the results.
Originally, sampling was planned at 17 sampling points, however, due to
severe weather condition, sampling was conducted only at 12 points for
yesterday.
We will continuously conduct the similar sampling.
attachment1: Results of Nuclide Analysis of Seawater(PDF 17.0KB)
attachment2: Radioactivity Density of Seawater(PDF 87.1KB)
