It depends on how the nuclear reactor is managed. Have companies shown they care about the people over profit? Has government proven to not be inept at regulations and inspections and punishments? On top of that, a natural disaster can cause one to melt down.

If we move to thorium, it's almost impossible to have a disaster, but it can't be made into a weapon and the profits are low so nobody wants to build the best source of feasible big power known to man.