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Coordinates: 54°25′27″N 3°29′53″W / 54.42417°N 3.49806°W / 54.42417; -3.49806
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54°25′27″N 3°29′53″W / 54.42417°N 3.49806°W / 54.42417; -3.49806

Windscale Piles
The Windscale Piles c. 1956. Pile No. 1 is on the left.
Reactor conceptAir-cooled reactor
Designed and built byMinistry of Supply
Operational1950–1957
StatusUndergoing decommissioning
LocationSellafield, Cumbria, England
Main parameters of the reactor core
Fuel (fissile material)Natural and enriched uranium
Fuel stateSolid (rods)
Neutron energy spectrumThermal
Primary control methodControl rods
Primary moderatorNuclear graphite
Primary coolantAir
Reactor usage
Primary usePlutonium production
Operator/owner

The Windscale Piles were a pair of air-cooled graphite-moderated nuclear reactors at the Windscale (now Sellafield) nuclear site in Cumbria, England. They were constructed from 1947–1950 by the Ministry of Supply, primarily to produce plutonium for the British atomic bomb project. However, they were also used to produce other nuclear material such as tritium for . They operated from 1950–