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 22, 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, no radioactive materials were 
detected as shown in the attachment. 

Yesterday, we increased the frequency of sampling near the south discharge
channel in order to monitor the impact on the surrounding environment of
closure work with steal sheet-piles implemented in the south of the
water-intake open channel for Unit 1 to 4.

We informed NISA and the government of Fukushima Prefecture of the results 
today. 

We conducted sampling surveys not at 14 points as we had planned, but at 5 
points due to the weather
We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater (PDF 20.1KB) 
attachment2: Radioactivity Density of Seawater (PDF 55.8KB)