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 1.)
 
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 time for analysis from 
October 24, so we will report the data of sampling analysis at offshore 
points on the day after next of the collected day.
                                                    (Previously announced)
 
On December 13 and 14, 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.
 
Furthermore, as the analysis results of strontium in the ocean collected 
on November 15, no strontium was detected as shown in the attachment.
 
Further, the sampling of 7 offshore points which was planned on the day 
before yesterday was changed at 1 points due to bad weather conditions.
 
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 37.2KB) 
attachment2: Nuclide Analysis Results of Radioactive Materials in Seawater 
             <coast and offshore> (PDF 10.9KB) 
attachment3: Radioactivity Density of Seawater (PDF 69.6KB)