Windscale Fire

A fire in the graphite core of the Windscale Pile No. 1 reactor released radioactive contamination across England and Europe.

📅 October 10, 1957 📍 Cumberland, England, UK ⚛️ Windscale Pile No. 1 (air-cooled graphite reactor)

The Fire

During a routine Wigner energy release operation (annealing of the graphite moderator to release stored radiation energy), uranium fuel cartridges overheated and ignited. The fire burned for two days before being extinguished with water, a risky decision that could have caused a steam explosion but ultimately worked.

Contamination

Radioactive gases, notably Iodine-131, were released and drifted across England and into Europe. Milk from farms within a 200-square-mile radius was banned and dumped for two months. The full extent of the release was deliberately understated in the official report.

The Cover-Up

Prime Minister Harold Macmillan ordered the official accident report to be sanitized before release, removing sections that showed the full scale of contamination. The reason was to protect the UK's nuclear weapons program and its relationship with the USA. Full details were not released until 1988.

📅 Timeline

Oct 7

Second nuclear annealing operation begins

Oct 10, 1:00 AM

Uranium cartridges found overheating

4:30 AM

Fire discovered in reactor core

Oct 11

Water used to extinguish fire

Oct 12

Fire extinguished; reactor permanently shut down

Oct 13

Milk from surrounding farms banned for 2 months