On March 21st, 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 - Pacific 
Ocean Earthquake. Therefore, we informed Nuclear and Industrial Safety 
Agency (NISA) and the government of Fukushima Prefecture of the results. 
Since March 22nd, we have conducted seawater sampling surveys at four 
points off the shore of Fukushima Daiichi Nuclear Power Station (twice a 
day at two points out of such four points since March 26th). 

Since April 17th, we have also conducted sampling surveys at four points 
(2 points have been added since April 26, another 3 points since April 
30th, 9 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 (Regarding 6 points in 9 points of 3km off the shore, 
from May 9th, we conduct sampling at the lower layer in addition to upper 
layer. We conduct sampling for those 6 points twice a week).

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 May 17th 2011, we conducted sampling to evaluate the spread of 
radioactive materials to the ocean which were detected at Fukushima Daiichi 
Nuclear Power Station. Since the radioactive materials were detected as 
shown in the attachment, today, we informed NISA and the government of 
Fukushima Prefecture of the results.

Due to the bad weather condition, we postponed the sampling in 11 off-coast 
locations yesterday.

We will continuously conduct the similar sampling. 

attachment1: Results of Nuclide Analysis of Seawater(PDF 25.5KB) 
attachment2: Radioactivity Density of Seawater(PDF 10.8KB)