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The most serious accident at a nuclear plant would be due to a loss of coolant accident (LOCA), which resulted in fuel meltdown and hence release of radioactivity to the environment. The safety design of the plant and its associated safety systems are essentially all aimed at preventing this from happening, or at least minimising any credible loss of coolant to a level that can be coped with without fuel damage.

The PWR and BWR designs provided they are built to the highest standards are considered by the NRC in the US and similar licensing authorities in other countries to be satisfactory in this respect, they would not get a license to operate otherwise.

The Chernobyl accident in the Ukraine in 1986 shows what can happen through a combination of a badly thought out design and laxity in operating methods, but hopefully the lessons have been learned from this experience. This type of reactor has never been built in the US or anywhere outside the former Soviet bloc.

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15y ago

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