TEPCO Press Release (Apr 17,2011)—Detection of Radioactive Materials from Seawater near Fukushima…

[OKIsItJustMe]

http://www.tepco.co.jp/en/press/corp-com/release/11041702-e.html

Press Release (Apr 17,2011)
Detection of Radioactive Materials from Seawater near Fukushima Daiichi Nuclear Power Station (25th 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 Daiich 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.)

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 16th, 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.

Regarding seawater sampling surveys at six points at 15 km off the coast 
of Fukushima Daiichi Nuclear Power Station scheduled to conduct yesterday, 
we canceled them due to the bad weather.

We will continuously conduct the same sampling surveys.
attachment1:Results of Nuclide Analysis of Seawater(PDF 12.6KB)

attachment2:Radioactivity Density of Seawater(PDF 53.1KB)

[aquart]

1. Radiation near Japan reactors too high for workers, Associated Press, April 18, 2011:

http://enenews.com/severe-spike-in-radiation-in-tank-at-no-2-spent-fuel-pool-japan-officials-say-it-could-be-from-damage-to-spent-fuel-rods



A pair of thin robots on treads sent to explore buildings inside Japan’s crippled nuclear reactor came back Monday with disheartening news: Radiation levels are far too high for repair crews to go inside. …

Officials said Monday that radiation had spiked in a water tank in Unit 2 and contaminated water was discovered in other areas of the plant, underscoring the growing list of challenges facing TEPCO in cleaning up and containing the radiation. They also described in more detail the damage to fuel in three troubled reactors, saying pellets had melted. …

Separately, readings from a water tank attached to the spent fuel pool in Unit 2 showed a severe spike in radiation that NISA officials said might have been caused by the escape of radioactive vapor from a nearby containment vessel. They said, however, the possibility of damage to spent fuel rods could not be ruled out. …

A pool of stagnant radioactive water was also discovered in the basement of Unit 4. …