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)