If you claim that a modern nuclear reactor can level a nearby city, you are telling a falsehood.
I was slightly unclear. Your statement is true.
I do not say that a modern nuclear reactor can level a city. I don't even claim or disclaim that the worst currently running nuclear reactor can level a city under reasonably imaginable coditions (I tend to agree that the fallout will be a problem, but a full-scale nuclear explosion is very unlikely but I have not enough evidence and knowledge to be sure either way).
I describe a situtation of the research of nuclear fission. Imagine that someone knows that a bigger pile of uranium emits more radiation and want...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
(I plan to make these threads from now on. Downvote if you disapprove. If I miss one, feel free to do it yourself.)