tell that to the chinese, who lost about 200,000 lives..when a series of dams burst.
a pumped storage facility is a teeny little thing and stores very little energy typically.
If you actually examine the effects of Hiroshima and Nagasaki, you will find that despite no especial efforts being made to clean them up., they are now perfectly safe to live in, and even at the time, there were no significant casualties from fall-out. The deaths were all due to massive radiation recieved close up.
IIRC about 50,000 died from blast or massive radiation IMMEDIATELY from the actual explosion. a few hundred died later from the same effects. almost no statistically significant effects are to be found from those who survived - say - a year and died later ..from natural causes.
Chernobyl spread FAR more radioactive crap around. again, bar the 3000 people who got thyroid cancer, (and few if any, died) and the 78 people who died as a result of firefighting (and who received massive doses or radiation) again, no one died from 'fallout'.
It is important not to confuse cold war and green propaganda, with facts.
The facts are that nuclear fallout is not especially harmful, and we treat it with caution because we can. Its far more dangerous to have radiotherapy for cancer where you will receive far higher doses.
That was not, however, my point. My point was that we, as a nation, use a stupendous amount of energy to live as we do, and that energy if stored in a form where it can be rapidly released is far far more dangerous than most people suppose.
and nuclear fuel which is only enriched enough to be able to JUST sustain a chain reaction, when arranged physically in a very precise and exact way, is one of the safest ways to do that.