One of the landers contained a small reactor designed to encourage the growth of micro-organisms.
It has threatened to use nuclear weapons and said it would restart a nuclear reactor.
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The five-megawatt reactor was North Korea's only source of plutonium for its weapons program.
That Syrian reactor, nearing completion, was destroyed by an Israeli air strike in 2007.
The reactor arrived in the port on August 16 and was discharged two days later.
It is possible that a deal on the reactor could be announced during Mr. Li's visit.
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The Nuclear Installations Inspectorate would then have to approve the restarting of the reactor.
Sheehan said one of the four reactor coolant pumps appears to have stopped working.
CNN: Pump triggers Three Mile Island reactor shutdown, NRC says
The Unit 2 reactor has been shut down since a partial meltdown in 1979.
CNN: Pump triggers Three Mile Island reactor shutdown, NRC says
The reactor at Fukushima wasn't designed to withstand a 9.0 earthquake or a 50-foot tsunami.
Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes.
Under its terms, Siemens would replace the reactor instrumentation and control mechanisms supplied by Moscow.
Would you trust your next door neighbor to responsibly manage a fission reactor in his basement?
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In 1981, Israel launched an air strike on an Iraqi nuclear reactor destroying it completely.
They include French nuclear group Areva, the Canada Pension Plan Investment Board, and reactor builder Westinghouse.
If a tsunami reached that high, California would have much bigger problems than a busted reactor.
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One huge difference between the Fukushima and Chernobyl circumstances relates to basic reactor facility design features.
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The reactor core would be no more than several metres wide and about ten metres long.
The reactor's fuel rods were damaged, but the vessels in which they were contained were intact.
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In December 1995, the Monju fast-breeder reactor at Tsuruga sprang a leak in its sodium-cooling circuitry.
During the decommissioning process, remaining fuel from the station's reactor will be removed and reprocessed.
On Tuesday, it announced it would restart a plutonium reactor it had shut down in 2007.
North Korea also said on Tuesday the Yongbyon reactor would provide electricity for the energy-starved country.
When push comes to shove, operators will pay hyperbolic prices to keep a reactor humming.
The five megawatt reactor was North Korea's only source of plutonium for its weapons program.
It is the AP 1000 reactor, a pressurized water reactor, sold by Westinghouse Electric Co.
For the reactor to work, it would need to fire ten times a second.
The building surrounding the vessel containing the No. 1 reactor exploded on March 12.
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Tepco had been pumping water to raise the level in the No. 2 reactor.
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