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Fukushima Power Plant, Boiling Water Reactor (BWR) diagram
fukushima-boiling-water-reactor-bwr-basic-diagram
Update,
The Washington Post reports that a second nuclear reactor in the Fukushima power plant is also affected. The plant has a total of six reactors. Reports only a few hours left on battery power for cooling systems.
Update,
Clarification from NHK Wolrd News Japan… a second location, Fukushima II, not far from the Fukushima I nuclear power plant, is also experiencing cooling problems. The government’s Nuclear and Industrial Safety Agency said equipment failures have made it impossible to cool 3 of the plant’s 4 reactors. (Translation: ‘impossible’ is not a good word).
Update,
Reuters is now reporting that Tokyo Electric Power Company has lost ability to control pressure at some of the reactors at its Fukushima II (Daini) plant nearby the Daiichi power plant (Fukushima I), both suffering from core cooling problems. If battery power at Fukushima II is depleted before AC power is restored, the plant will stop supplying water to the core and the cooling water level in the reactor core will drop.
Update,
Kyodo news reports that the cooling system has now failed at three nuclear reactors at Fukushima II, and the coolant water temperature has reached boiling level.
Update,
Kyodo news reports, “the operator of the two plants in Fukushima Prefecture is set to release pressure in containers housing their reactors under an unprecedented government order, so as to avoid the plants sustaining damage and losing their critical containment function.” …”the action would involve the release of steam that would likely include radioactive materials”
Update,
From Kyodo news, Japan, URGENT: Concerns of core partially melting at Fukushima nuke plant. The core at Fukushima No. 1 nuclear power plant’s No. 1 reactor may be partially melting, the nuclear safety agency said Saturday.
Reuters, Japan authorities: TEPCO plant fuel rods may have melted -Jiji, …could develop into a breach of the nuclear reactor vessel and the question then becomes one of how strong the containment structure around the vessel is and whether it has been undermined by the earthquake
Update,
Reuters, An explosion was heard and smoke was seen at the Tokyo Electric Power Company Fukushima No.1 nuclear power plant, Jiji news agency quoted the police as saying on Saturday.
Outer structure of building that houses reactor at Fukushima plant appears to have blown off – NHK by Reuters_TonyTharakan at 3/12/2011 8:12:43 AM12:12 AM
Tepco says explosion may have been hydrogen used to cool Fukushima plant – Kyodo; Tepco says 4 people taken to hospital after reported explosion, no word on condition – Jiji
Update,
From The Associated Press, An explosion at a nuclear power station Saturday destroyed a building housing the reactor…the explosion destroyed the exterior walls of the building where the reactor is placed, but not the actual metal housing enveloping the reactor.
In 1986, the Chernobyl nuclear reactor exploded and caught fire, sending a cloud of radiation over much of Europe. That reactor – unlike the Fukushima one – was not housed in a sealed container, so there was no way to contain the radiation once the reactor exploded.
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