TEPCO Press Release (Apr 19,2011)—Detection of Radioactive Materials from Seawater near Fukushima…

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http://www.tepco.co.jp/en/press/corp-com/release/11041910-e.html

Press Release (Apr 19,2011)
Detection of Radioactive Materials from Seawater near Fukushima Daiichi Nuclear Power Station (27th release)

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 - 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).

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

In accordance with the direction from NISA on April 15th, four points at
3 km off the coast and two points at 8 km off the coast have been added
to sampling since April 17th.

The data of detected three 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 April 18th, 2011, we conducted sampling surveys to evaluate the spread
of radioactive materials which were detected at Fukushima Daiichi Nuclear
Power Station. Since the radioactive materials were detected as shown in
the exhibit, we informed NISA and the government of Fukushima Prefecture
of the results.
In addition, we implemented sampling survey which is the once a day at six
points at 15km off the coast since April 17th.

We will continuously conduct the same sampling surveys.


attachment1:Results of Nuclide Analysis of Seawater(PDF 24.6KB)
attachment2:Radioactivity Density of Seawater(PDF 11.7KB)
attachment3:Radioactivity Density of Seawater (coast)(PDF 21.8KB)
attachment4:Radioactivity Density of Seawater (off the coast)(PDF 27.8KB)