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.

As of August 2020, activities at the site include nuclear fuelfuel reprocessing, nuclear waste storage and nuclear decommissioning, and it is a former nuclear power generating site. The site covers an area of two square miles and comprises more than 200 nuclear facilities and more than 1,000 buildings.

The site currently directly employs about 10,000 people and is owned by the Nuclear Decommissioning Authority (NDA) which is a non-departmental public body of the UK government. Following a period 2008-2016 of management by a private consortium, the site has been returned to direct government control by making the Site Management Company, Sellafield Ltd, a subsidiary of the NDA.

The 2018-2021 NDA business plan for Sellafield decommissioning is focused on these high hazards and includes the following key activities in the area of Legacy Ponds and Silos;

  • Pile Fuel Storage Pond: Sustain sludge exports and prepare for de-watering
  • Pile Fuel Cladding Silo: Complete commissioning of Box Encapsulation Plant to received silo contents, and begin retrievals.
  • First Generation Magnox Storage Pond: Continue to retrieve fuel and sludge.
  • Magnox Swarf Storage Silo: Begin retrievals from the silo.

The site is due to be fully decommissioned by 2120 at a cost of £121bn