Posted by warbaby on April 14, 2021 at 11:07:46 from (24.247.205.221):
In Reply to: Re: Electric_pick-ups posted by john in la on April 14, 2021 at 08:45:38:
You mean like these? The accident was triggered by the Thoku earthquake and tsunami on Friday, 11 March 2011.[11] On detecting the earthquake, the active reactors automatically shut down their normal power-generating fission reactions. Because of these shutdowns and other electrical grid supply problems, the reactors' electricity supply failed, and their emergency diesel generators automatically started. Critically, these were required to provide electrical power to the pumps that circulated coolant through the reactors' cores. This continued circulation was vital to remove residual decay heat, which continues to be produced after fission has ceased.[12] However, the earthquake had also generated a tsunami 14 metres (46 ft) high that arrived shortly afterwards and swept over the plant's seawall and then flooded the lower parts of reactors 14. This flooding caused the failure of the emergency generators and loss of power to the circulating pumps.[13] The resultant loss of reactor core cooling led to three nuclear meltdowns, three hydrogen explosions, and the release of radioactive contamination in Units 1, 2 and 3 between 12 and 15 March. The spent fuel pool of previously shut down Reactor 4 increased in temperature on 15 March due to decay heat from newly added spent fuel rods, but did not boil down sufficiently to expose the fuel.[14]
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