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AnswerNot all of them are fully known.
  • Chernobal was the worst
  • Three Mile Island was a problem
  • There have been a number of nuclear submarines that have sunk
  • And there have been a number of nuclear warheads lost at sea.
AnswerThe International Nuclear Event Scale (see Wikipedia link below) lists seven levels of significance of nuclear events, from 1 (least significant) to 7 (most). Levels 3 and lower are limited to accidents with off site exposure within health safety limits. The level 4 and higher incidents that are known to have happened include the following:
  • Level 7 Chernobyl Disaster
  • Level 6 Kyshtym Disaster
  • Level 5 Windscale Fire, Three Mile Island Accident, Goiania Incident
  • Level 4 ten incidents in various places

The listed events are all related to power production except the Goinia Incident, which related to abandoned radioactive medical materials. Events relating to warfare, lost warheads, lost submarines, and so on are not on the list. Nor some industrial problems, such as what happened to the Radium Girls.

There are links to Wikipedia articles below.

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15y ago

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