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The Fukushima Daiichi nuclear disaster in 2011 occurred due to a loss-of-coolant accident. The circuits that provided electrical power to the coolant pumps failed causing a loss-of-core-cooling that was critical for the removal of residual decay heat which is produced even after active reactors are shut down and nuclear fission has ceased.
LOCA loss of coolant accident. 2,739 litres of coolant oil leaked, most of it into the Winnipeg River. The repair took several weeks for workers to complete. [23] 0: Unknown August 1, 1983: Pickering nuclear Reactor 2, Pickering, Ontario, Canada: LOCA loss of coolant accident. Pressure tube, that holds the fuel bundles, ruptured due to hydriding.
Some indications in the control room stopped functioning and operators correctly assumed loss of coolant (LOC). At 18:18 on 11 March, a few hours after the tsunami, operators attempted to manually open the IC control valve, but the IC failed to function, suggesting that the isolation valves were closed.
On 13 October 1960, while operating in the Barents Sea, K-8 suffered a ruptured steam generator tube, causing a loss-of-coolant accident.While the crew jury-rigged a system to supply emergency cooling water to the reactor, preventing a reactor core meltdown, large amounts of radioactive gas leaked out which contaminated the entire vessel.
There were three loss-of-coolant-accidents that took place at WR-1 over its lifetime. Two reached the Winnipeg River. The first leak was in 1967, where approximately 300 litres of coolant reached the river through the outfall (the discharge point of the liquid waste) as a result of a pin-hole leak in one of the tubes in the heat exchanger.
Malfunction during fuel replacement. Fuel rod ejected from reactor into the reactor hall by coolant (CO 2). [35] 2: 1,700: 4 March 28, 1979: Three Mile Island, Pennsylvania, United States: Loss of coolant and partial core meltdown due to operator errors and technical flaws. There was a small release of radioactive gases.
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Loss of cooling, radioactive contamination, nuclear fuel damaged During sea trials, the Soviet nuclear submarine K-27 (Project 645) suffered severe problems with its reactor cooling systems. After spending some time at reduced power, reactor output inexplicably dropped and sensors detected an increase of gamma radiation in the reactor ...