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. (We stopped 1 point
15km off the shore and 3 points 30km off the shore since September 9.)

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.

We have conducted an action to lower a detection limit level of the
radioactivity concentration and extended the analysis time from October
24, so we will be reported the data of sampling analysis at offshore
points on the day after next of the collected day.
                                                    (Previously announced)

On November 2 and 3, 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.

Besides, the analysis of the seawater collected on October 10, 2011 for
Plutonium and Strontium showed that Strontium-89 and 90 were detected as
shown in the attachment.

We reported the above results to NISA as well as to the government of
Fukushima Prefecture today.

We will continuously conduct the same sampling surveys. 

attachment1:Nuclide Analysis Results of Seawater (PDF 18.0KB) 
attachment2:Nuclide Analysis Results of Radioactive Materials in Seawater 
                                          <Coast & Offshore>(PDF 10.5KB) 
attachment3:Analysis Result of Plutonium in the seawater at Fukushima 
                                Daiichi Nuclear Power Station (PDF 10.1KB) 
attachment4:Radioactivity Density of Seawater (PDF 70.5KB)