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When the accident at Fukushima happened, the temperatures in the reactor vessels increased and the pressures went up. In order to deal with this, steam was released from the pressure vessels. Water boiling in the reactors exposed the fuel rods, and since the zircaloy cladding of the rods reacts with steam, producing hydrogen, this reaction is the most likely source. This situation is, of course, a meltdown.

The problem with the hydrogen, of course, was that it collected in the reactor buildings, mixed with the atmosphere, and exploded.

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14y ago

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