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

We have also informed NISA on the results of seawater sampling survey 
which has been implemented since April 2nd at three different points 
within 15km area of the Fukushima Daiichi Nuclear Power Plant. 

The data of 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 instruction on April 1st.
                                                    (We already informed.) 

On April 5th, 2011 we conducted sampling survey to evaluate the spread of 
the radioactive substances which were detected at Fukushima Daiichi 
Nuclear Power Station. Since the survey detected radioactive substances as 
shown in appendix, we informed NISA and Fukushima Prefecture about the 
result. 

Also, regarding the sampling points at 15km offshore, a monitor was 
carried out twice a day at the same sampling points (6 points in total) as 
the day before yesterday. We have informed the results to NISA and 
Fukushima today.

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 12.7KB) 
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 12.6KB) 
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 16.2KB) 
Appendix7: The result of the nuclide analysis of the seawater 
           (Around 15km off shore of Fukushima Daiichi Nuclear Power Station)(PDF 12.0KB) 
Appendix8: The result of the nuclide analysis of the seawater 
           (Around 15km off shore of Fukushima Daini Nuclear Power Station)(PDF 16.1KB) 
Appendix9: The result of the nuclide analysis of the seawater 
           (Around 15km off shore from Iwasawa Sea Shore)(PDF 16.1KB) 
Appendix10: The result of the nuclide analysis of the seawater 
            (Around 15km off shore from Hirono Town)(PDF 16.1KB) 
Appendix11: Radioactivity Density of Seawater(PDF 36.7KB)