As with almost everything there are good and bad points to nuclear power. Good points are that they don’t pollute the environment, they don’t emit radiation (even less than a coal burning power station), and they generate a lot of power from relatively little fuel. Bad points are that ones with graphite in them have a limited lifetime because the graphite cannot be replaced when damaged, they look horrible (see this one ) and if there is a bad accident, the effects last a long time due to the amount of time it takes for the radiation to diminish. They are very well understood now though, so in general they are safe but the accidents are bad. This is what scientists have to decide: is the risk of an accident worth the many years of energy? I hope this has answered your question.
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