Sunday, March 27, 2011

Nuclear disaster in Fukushima of Japan seawater from polluted coastal

The radioactive contamination of coastal waters off Fukushima Daiichi nuclear power plant has reached a new high. Exposure to iodine-131 in sea water near the plant exceeded the permissible limit by the 1250fache, such as the Nuclear Safety Authority NISA said. Before the 330 meters south of the plant samples showed only one 100 times as high radiation exposure.

The operator of the damaged nuclear power plant, Tepco, admitted that flowed with great probability radioactive water from nuclear power plant into the sea. In the reactor units 1 to 4 above, radioactive water was leaked to some 10,000 times increased radiation, which comes either from the reactor core or from the cooling ponds for spent nuclear fuel rods.

The contamination of water in Block 1 of the nuclear power plant contains high levels of cesium 137, as it is after the Chernobyl nuclear disaster almost 25 years ago arrived in large quantities in the environment. The Japanese Nuclear Safety Authority NISA published on Saturday, an analysis of the water, and eight of radioactive substances were found.

The highest was found in cesium-137: 1.8 million becquerels. The forces trying to remove the spilled water to continue the work on the wiring of the cooling systems. The irradiated water on the floor of premises in the vicinity of the reactor vessel is in block 3 high after a report from the news agency Kyodo 1.50 meters.

In Block 2 there are 1 meter, 0.80 meters in Block 4 and Block 1 were measured 40 centimeters. The reactor units 1 to 3 were cooled again on Saturday with water from the outside to stop the threat of overheating. Because of the high radiation exposure, occurred after a report by Japanese broadcaster NHK from a greater distance than before.

Not now more sea water but fresh water was used. Several experts, particularly in the United States, worried about a sea water caused by fouling of the fuel rods expressed with salt. Toshimi Kitazawa Japan's defense minister announced that it was necessary to reach very quickly to the shift to a cooling system with fresh water.

The U.S. government had offered its assistance for this purpose. According to the International Atomic Energy Agency, many preparations are necessary before engineers investigate the suspected leak in the reactors and may seal the can. could IAEA safety spokesman Denis Flory said the reactors would have to first be cooled further to the first place to create an environment in which people work inside the reactor and assess the damage.

"At this stage we are not long," said Flory. Since the crisis began in Fukushima Daiichi nuclear power plant were to a report by the Kyodo news agency on Saturday for 17 workers contaminated. Only those accidents were considered where a radioactivity was measured in excess of 100 mSv - equivalent to the maximum load for workers in nuclear power plants over an entire year.

However, the Labour Department has raised this limit for the workers in Fukushima now to 250 mSv. In an accident on Thursday in the turbine building of block 3, two workers were exposed without a protective boot for information from NHK to radiation 2000-6000 mSv. Meanwhile, workers have made in the control room of reactor 2, the power is restored.

There, burning light again, the Japanese news agency Kyodo reported. The workers have been trying for days to supply the damaged reactor in Fukushima back power to the cooling system back into gear. Meanwhile, snow and temperatures around freezing impede on Saturday to clean up the disaster area in the northeast of Japan's main island Honshu.

"It's so cold that we can not do anything," said a survivor of the television station NHK, who returned with his wife in his house damaged by the earthquake. In some places, to secure volunteers supported the victims, their belongings in destroyed houses. The earthquake of magnitude 9.0 and thus triggered the tsunami, according to official data at least 10 102 people were killed.

17 053 people are still missing, so authorities expect a further increase in the number of casualties.

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