On March 21st, 2011, we conducted sampling surveys, 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 are added since April 26, another 3 points from 
April 30th, total of 9 points) 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.

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 based on the improved measures for recurrence 
prevention which have been prepared in accordance to a warning from 
NISA on April 1st. (Previously announced)

On May 8th, 2011, we conducted sampling surveys 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, we informed NISA and the government 
of Fukushima Prefecture of the results.

Yesterday's offshore sampling at 17 points was not conducted due to bad 
weather.

We will continuously conduct the similar sampling surveys. 

attachment1:Results of Nuclide Analysis of Seawater(PDF 59.5KB) 
attachment2:Radioactivity Density of Seawater(PDF 83.8KB)