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First of all, the accident at Chernobyl was many many many times worse than Three Mile Island. At Chernobyl the reactor was blown apart by a steam pressure surge, so that a lot of very active material was ejected from the reactor, air ingress caused the graphite to burn, and much of the fuel melted. As there was no secondary containment, radioactive material from the fuel spread all over the site and its surroundings. This is just about the worst thing that can happen to a reactor. I think 47 total died quickly, all operators or fire and rescue people, from radiation sickness. There were also 7 child thyroid cancer deaths. As far as the long term effects are concerned, I believe they were exaggerated in early predictions, but of course development of cancers can take many years, so the true consequences won't be known for some years yet, and one must be careful to separate extra cancers from what would occur in any large population, in assessing this. At Three Mile Island there was a partial meltdown due to loss of coolant, and some activity was released, but much less than at Chernobyl. Assessment of health effects showed no effects on the local population. The reactor of course was a complete write off and a dead loss to the owners. See links given below

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