As far as I know, it hasn't happened, not even once.

Your objection appeals to emotions, not to reason. The very kind of objection that has enabled fossil fuels to be seen as less dangerous. FYI, nuclear energy has killed single digits of people. Fossil fuels kill around 10M annually through pollution alone.

Granted, your lament aims to make people privilege clean energy over nuclear, but in nature it is still the kind of thought-terminating fearmongering that gets us surveillance to protect children, so I object on principle.