Location of numerous nuclear facilities in Cumbria, England. At the Sellafield location, the reprocessing plant THORP is in operation since 1994, and the four gas-graphite reactors of the nuclear power plant Calder Hall have been operated from 1956 till 2003. Part of the Sellafield location is known under the name Windscale where an incident occurred in one of the two military plutonium reactors in 1957.