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During the final stage of World War II, the United States detonated two nuclear weapons over the Japanese cities of Hiroshima and Nagasaki on August 6 and 9, 1945
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Partial core meltdown at Santa Susana Field Laboratory’s Sodium Reactor Experiment.
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partial meltdown of reactor number 2 of Three Mile Island Nuclear Generating Station (TMI-2) in Dauphin County, Pennsylvania
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Nuclear power plant meltdown
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Leaked radioactive gases and iodine into the air through a ruptured fuel channel.
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tsunami flooded and damaged the plant's 5 active reactors, drowning two workers. Loss of backup electrical power led to overheating, meltdowns, and evacuations