Windscale fire
Accident
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The Windscale fire of 10 October 1957 was the worst nuclear accident in the United Kingdom's history, and one of the worst in the world, ranked in severity at level 5 out of 7 on the International Nuclear Event Scale. Wikipedia
Location: Sellafield
Date: October 10, 1957
Deaths: Estimated 100 to 240 cancer fatalities in the long term
Non-fatal injuries: A maximum of 140 of the estimated 240 additional cases of cancer non-fatal
Outcome: INES Level 5 (accident with wider consequences)