I was thinking more along the lines of, solar flare coinciding with massive earthquake causes multiple simultaneous Chernobyl's type thing.
https://worldbuilding.stackexchange.com/questions/65198/what...
Choice quotes:
"Short answer not much would happen. There just is not enough of them and even in the worst case breakdown they don't release that much radiation."
"Even if every single reactor in the US 'failed' today, I doubt there would be significant radiation leakage ... without a 40 foot tsunami, I think this is more like Three Mile Island."
"The problem is that there is a great deal of exaggeration in the public's idea of radiation - the "Omigawd, it's radioactive! We're all gonna DIE!" effect."