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-Taiheiyou-
Oki 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.
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,
and another 1 point since May 5, 10 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.
Also, we added 2 points each 5 and 30 km off the shore since May 27, and 1
point each 5, 15 and 30 km off the shore since June 2.
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 August 31, 2011, we conducted sampling to evaluate the spread of
radioactive materials to the ocean which were detected at Fukushima
Daiichi Nuclear Power Station. As a result, radioactive materials were
detected as shown in the attachment.
The sampling planned to be conducted yesterday at 3 points on offshore
were suspended due to the weather condition. And the additional sampling
at around south discharge channel associated with closure construction
with steel pipe sheet piles at south of intake channel open conduit of
Unit 1-4 was also suspended due to weather condition.
We informed NISA and the government of Fukushima Prefecture of the results
today.
We will continuously conduct the similar sampling. 
attachment1: Nuclide Analysis Results of Seawater (PDF 12.8KB)
attachment2: Radioactivity Density of Seawater (PDF 38.6KB)
