Nuclear plant meltdowns are serious, but they are not that much more, or maybe more at all, than any other type of similarly sized power plants. Coal plant fires have gone on for years. There will not be expansive fallout that causes illness far away from something like this. It is a localized event. The danger of nuclear fallout, while serious in practical cases, has been overblown in its description by most people in mainstream society. The odds of an epidemic of noticeable consequences from fallout anywhere besides directly on the surrounding property of a meltdown or nuclear explosion are negligible at best. There have been thousands of nuclear warheads used on Earth already.