How did the Fukushima accident happen?

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An earthquake and tsunami led to power loss in the Fukushima Daiichi plant. Without power, the cooling systems failed in three reactors, and their cores subsequently overheated. This led to a partial meltdown of the fuel rods, a fire in the storage reactor, explosions in the outer containment buildings (caused by a buildup of hydrogen gas), and the release of radiation into the air and ocean.