ich geh jetzt pennen und werde hoffentlich morgen nicht von weiterenden brennenden oder explodierenden reaktoren geweckt..
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Erdbeben/Tsunami in Japan (Stärke 9,0)
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http://www.ustream.tv/channel/nhk-world-tvSpliT schrieb
wo genau bei nhk world?Mike187 schrieb
also wenns brennt und es keine explosion gab, könnte man doch vermuten, dass da grade ne kernschmelze stattfindet.
nhk world sagt gerade, dass keiner löschen kann, weil die strahlung zu hoch is....
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NPR:
According to NHK television, officials at Tokyo Electric Power Co. decided a hole in the roof of the reactor was dozens of meters from the swimming-pool-like chamber where the spent fuel rods are overheating. So a helicopter dump, similar to putting out a forest fire, probably wouldnt reach the pool.
Moreover, officials say helicopters cant carry enough water to do the job. And Japanese defense ministry officials are worried about the safety of military personnel on the helicopters, according to Kyodo News.
TEPCO, which operates the Fukushima power plant, is still considering the use of high-pressure fire hoses to spray cooling water into the spent-fuel pool.
Radiation levels are far too high to permit workers to bring hoses anywhere near the pools edge to re-flood it manually.
U.S. nuclear safety experts agreed. David Lochbaum, director of the nuclear safety program at the Union of Concerned Scientists, says a study done for Connecticut nuclear power plants concluded that in a situation such as this one, radiation would be so intense that a worker at the pools edge would receive a lethal dose in something like 16 seconds.
The spent-fuel problem is a new wild card in the potentially catastrophic failure of the Fukushima power plant. Since last Fridays 9.0 earthquake, the plant has been wracked by repeated explosions in three different reactors.
Some experts are now concerned that spent fuel rods may overheat in two other reactors, even though they were not in service at the time of the earthquake. Those two units, Nos. 5 and 6, have not yet reported problems.
There are accounts that theyre having difficulties cooling those three spent fuel pools and they need to regain control of that, says Lochbaum, a nuclear engineer by training. Or as a minimum, need to be able to replace the water that may be evaporating or boiling away to prevent the water from dropping below the level of irradiated fuel in the bottom of those spent fuel pools to prevent their damage from overheating as well.
Radiation Concerns From Spent Fuel Rods
The problem at reactor No. 4 was apparently brewing for some time before Tuesdays fire. The company says the temperature of the spent fuel pool reached 183 degrees Fahrenheit on Monday twice the normal level. It apparently went higher, but a technical failure prevented later readings ..
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