Because a nuclear explosion in a nuclear power plant is impossible due to the low fuel enrichment, the worst conceivable accident is a severe loss-of-coolant accident (LOCA), leading to a core meltdown. Although the nuclear fission and fusion process would be immediately stopped by a control rod insertion, the radioactive fission products would continue to generate decay heat in the fuel. Thus, a LOCA producing core uncovering could cause the fuel to melt. In the most extreme case, a molten mass would fall to the bottom of the reactor, melting through the reactor pressure vessel and the underlying concrete, and eventually coming to rest about 6.1 m (20 ft) underground. (more…)
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