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 6 and 7, 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 14, and plutonium in the ocean collected on November 15, the 
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.

Due to the weather condition, planned sampling surveys at offshore points 
were canceled.

We will continuously conduct the same sampling surveys. 

attachment1: Nuclide Analysis Results of Seawater (PDF 20.0KB) 
attachment2: Nuclide Analysis Results of Seawater 
                                (Date of sampling 11/14/2011) (PDF 97.1KB) 
attachment3: The Result of analysis for Pu in the ocean around Fukushima Daiichi (PDF 7.77KB) 
attachment4: Radioactivity Density of Seawater (PDF 57.0KB)