> Once a nuclear chain reaction stops Please note that, despite your apparently reasonable handwaving, in fact fission reactions are still occurring in uranium

> Once a nuclear chain reaction stops Please note that, despite your apparently reasonable handwaving, in fact fission reactions are still occurring in uranium fuel masses buried deep inside what's left of at least one of Chernobyl's reactors. Not saying there is any need to panic. But try not to let a false sense of security lull you into a coma.