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In page Sellafield:

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The site was established with the creation of Royal Ordnance Factory (ROF) Sellafield by the Ministry of Supply in 1942; built by John Laing & Son[1] at the hamlet of Low Sellafield.[2] The nearby sister factory, ROF Drigg, had been constructed in 1940, 5 km to the south-east near the village of Drigg.[3] Both sites were classed as Explosive ROFs, producing high-explosive at ROF Drigg, and propellant at ROF Sellafield. They were built in this location to be remote from large centres of population because of the hazardous nature of the process, and to reduce the risk of WW2 enemy air attack. There were also existing rail links, and a good supply of high quality water from Wastwater. Production ceased at both factories immediately following the defeat of Japan.