On March 21st 2011, a sampling survey, conducted as a part of monitoring 
of surrounding environment, detected radioactive materials in the seawater 
around the water discharge port (south) of Fukushima Daiichi Nuclear Power 
Station which was damaged by the Tohoku-Chihou-Taiheiyou-Oki Earthquake. 
Therefore, we informed the result of Nuclear and Industrial Safety Agency 
(NISA) and the government of Fukushima Prefecture.

We have also informed NISA of the results of seawater sampling surveys 
which have been implemented since April 2nd at three different points 
within 15km area of the Fukushima Daiichi Nuclear Power Station (Since 
April 5th, it has been implemented at six different points, and since 
April 6th it has been done twice a day at six different points.) 

The data of the detected three nuclides (Iodine-131, Cesium-134 and 
Cesium-137) will be reported as fixed data. Other nuclides figures are to 
be reinvestigated by improved measures under NISA's warning on April 1st.
                                                   (previously announced)

On April 7th, 2011 we conducted sampling surveys o evaluate the spread of 
the radioactive materials which were detected at Fukushima Daiichi Nuclear 
Power Station. Since the some radioactive materials were detected as shown 
in the appendix, we informed NISA and the government of Fukushima 
Prefecture of the result.

Also, yesterday, regarding the three sampling points (Minami-Soma City 
offshore, Ukedo River offshore and Fukushima Daiichi Nuclear Power Station 
offshore) among the six sampling points at 15km offshore, where sampling 
surveys were supposed to be conducted twice a day, in fact surveys were 
conducted only once a day due to the bad weather. For today, the sampling 
at all of the six points 15km offshore was all skipped due to the bad 
weather.

We are intending to conduct the same sampling investigation. 

Appendix1: The result of the nuclide analysis of the seawater 
           (Around the water discharge (north) of Unit 5 and 6 of  
           Fukushima Daiichi Nuclear Power Station(approx. 30m north  
           from the water discharge of Unit 5 and 6))(PDF 60.7KB)  
Appendix2: The result of the nuclide analysis of the seawater 
           (Around the water discharge (south) of Fukushima Daiichi  
           Nuclear Power Station(approx. 330m south from the water  
           discharge of Unit 1 to 4))(PDF 60.2KB) 
Appendix3: The result of the nuclide analysis of the seawater 
           (Around the north water discharge of Fukushima Daini Nuclear  
           Power Station (around Units 3 and 4)(approx. 10km from  
           Fukushima Daiichi Nuclear Power Station))(PDF 11.0KB)  
Appendix4: The result of the nuclide analysis of the seawater 
           (Around Iwasawa shore at Fukushima Daini Nuclear Power Station  
           (Approx. 7,000m to the south of Units 1 and 2 water discharge) 
           (Approx. 16km from Fukushima Daiichi))(PDF 11.0KB)  
Appendix5: The result of the nuclide analysis of the seawater 
           (Around 15km off shore from Minami-Soma City)(PDF 16.0KB) 
Appendix6: The result of the nuclide analysis of the seawater 
           (Around 15km off shore from Ukedogawa River)(PDF 9.85KB)  
Appendix7: The result of the nuclide analysis of the seawater 
           (Around 15km off shore of Fukushima Daiichi Nuclear Powerv 
           Station)(PDF 9.89KB)  
Appendix8: The result of the nuclide analysis of the seawater 
           (Around 15km off shore of Fukushima Daini Nuclear Power  
           Station)(PDF 11.4KB)  
Appendix9: The result of the nuclide analysis of the seawater 
           (Around 15km off shore from Iwasawa Sea Shore)(PDF 11.4KB)  
Appendix10:The result of the nuclide analysis of the seawater 
           (Around 15km off shore from Hirono Town)(PDF 11.4KB)  
Appendix11:Radioactivity Density of Seawater(PDF 33.9KB)