Many if not most nuclear power plants are build at natural water sources to provide and dump water conveniently.
>people get cancer
It... depends. Too much radioactivity will kill you in a few years. WAY too much radioactivity will kill you immediately. You won't only get cancer, but several health problems over the next months/years. Children might be born with abnormalities.
The whole area is basically unusable for farming, as it effects every life form and you can't contain it or separate plants from it, unlike toxic mud.
>a lot more experienced in containing such infections and the risks therefore
You mean a lot more biased in your confidence. But what will the workers do if shit hits the fan? Will they be able to react fast enough, or at all?
Hacking is rarely easy, but as a defender you're on the short end, you'll just don't know what your attacker knows about you.
Well yeah my point is at some level there is always a threat and therefore Nuclear power can't be the final answer.