My guess is it’s minimal, but I in no way want to minimize the potential consequences of a nuclear accident. Badly designed/managed nuclear plants (Chernobyl) can have disastrous consequences. One of our members on a precious thread with in-depth knowledge of the accident made some excellent points against nuclear, but I would just add:

1)>30,000 died as the result of the Tsunami that hit Fukushima, but not a single person was killed by the plant meltdowns.
2) There has never been a fatality or serious injury from a nuclear power plant in the US
3) in the case of TMI and Brown’s Ferry, the safety systems did work (in both cases in the face of human error, or abject stupidity at Brown’s Ferry) and the plants were shut down safely with no major radiation leaks or injuries.

Nuclear IS a potentially dangerous technology, but I just don’t see the alternative.