Both the Chernobyl and 3 mile Island disasters were not caused by tsunamis and earth quakes.
And all it takes is for a derranged plant operator or a terrorist act and a reactos core meltdown in the US is reality
Records released since 9/11 show that the initial preferred target of the Hijackers was the Nuclear Power plant just outside New York city. But they decided against it because they thought that it would be heavily protected and maybe gaurded by jets or missles. This reality was that Nuclear power plants were not protected at all in the USA - apart from the no fly zone above and near a nuclear plant. And I doubt the Hijackers would hae worried about that precaution.