Windscale burned radioactive fuel for three days. ☢️ . . . On October 10, 1957, uranium ignited inside Pile No. 1 in Cumbria, where workers battled a reactor fire without fully understanding what was burning. Radioactive iodine escaped, and roughly 1.14 million liters of nearby milk were destroyed. Britain's worst nuclear accident began inside a reactor designed to make plutonium.
Source
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