The last reactor shut down in 1987, though a mammoth cleanup effort remained to address what state and federal authorities deemed the most contaminated site in the Western Hemisphere.
Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes.
The trouble began Jan. 31, when the Unit 3 reactor was shut down as a precaution after a tube break.
This should also be an opportunity for Westinghouse, which has designed the third-generation AP1000 reactor to shut down safely even in the event of complete loss of electric power.
As a former nuclear submarine officer, he once awoke to alarms and flooding, which shorted out most circuits and caused the reactor to shut down (the backup diesel generators were offline for maintenance).
The U.S.-Korea Institute at Johns Hopkins School of Advanced International Studies has analyzed recent commercial satellite imagery of the Nyongbyon nuclear facility, where the reactor was shut down in 2007 under the terms of a disarmament agreement.
In like manner, I believe that reactors should be designed such that an earthquake of any magnitude could not destroy the reactor or its containment shell, further that if the reactor core was to start to melt down, the melt down itself would shut the reactor down and, at the very worst, the reactor would entomb itself with no potential release of radiation into the environment.
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The Unit 2 reactor has been shut down since a partial meltdown in 1979.
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On Tuesday, it announced it would restart a plutonium reactor it had shut down in 2007.
There was no operator error involved at Fukushima-Daiichi, and each reactor was successfully shut down within moments of detecting the quake.
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Reactor two at Oldbury nuclear power station was turned off in 2011 and reactor one was shut down last year, after 45 years.
Thursday marked the second time in a month that the reactor has been shut down, following an August 22 leak in a heating system used to pressurize water.
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That's when the Tennessee Valley Authority, a government-owned corporation, resurrected a North Alabama reactor that had been shut down for safety reasons 22 years ago.
Worse, despite fire alarms going off all over the place, operators had shut down the reactor slowly by hand instead of hitting the panic-button to close the reactor immediately.
Can it shut down a nuclear reactor in the mountains of Tehran?
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North Korea had shut down its nuclear reactor in Yongbyon in July.
But what diplomats are saying on the sidelines is that the main idea of the draft document that the host nation China put forward is to get North Korea to shut down its main reactor at Yongbyon and to reintroduce the international inspectors that they kicked out in 2002.
Diplomats say the U.S. and North Korea's neighbors are pushing for North Korea to shut down its main nuclear reactor at Yongbyon and submit to international inspections.
In exchange for energy and financial assistance, North Korea last year agreed to shut down its Yongbyon nuclear reactor and declare the scope of its nuclear program.
Russia also said it would shut down its last plutonium-producing reactor.
This traded annual supplies of heavy fuel oil, and eventually two western-designed nuclear reactors, for North Korea's agreement to shut down its own plutonium-rich reactor, whose fuel rods could have been reprocessed into bomb cores.
Spain's oldest nuclear power station - the Santa Maria de Garona plant - was shut down on Sunday because the Ebro river water became too hot to cool its reactor.
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