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Dounreay (ˌduːnˈreɪ; Dùnrath) is a small settlement and the site of two large nuclear establishments on the north coast of Caithness in the Highland area of Scotland. It is on the A836 road west of Thurso. The nuclear establishments were created in the 1950s. They were the Nuclear Power Development Establishment (NPDE) for the development of civil fast breeder reactors, and the Vulcan Naval Reactor Test Establishment (NRTE), a military submarine reactor testing facility. Both these no longer perform their original research functions and will be completely decommissioned, some of which has been in progress for a while. The two establishments have been a major element in the economy of Thurso and Caithness, but this will decrease with the progress of decommissioning. The NPDE will enter an interim care and surveillance state by 2036, and become a brownfield site by 2336. An announcement in July 2020 that the Nuclear Decommissioning Authority (NDA) will be taking over direct management of the site from the site licence company Dounreay Site Restoration Limited (DSRL) in 2021 has alleviated fears of 560 job losses. The NRTE is to be decommissioned under a ten-year contract starting in 2023, ending in the creation of a brownfield site, which would be transferred to the NDA. Dounreay is the site of Dounreay Castle (now a ruin) and its name derives from the Gaelic for 'fort on a mound'. Dounreay was the site of the battle of Sandside Chase in 1437. Robert Gordon's map of Caithness, 1642, uses Dounrae as the name of the castle. William J. Watson's The Celtic Place-names of Scotland gives the origin as Dúnrath, possibly a reference to a broch. Dounreay was the site of a Second World War airfield, named RAF Dounreay. It became HMS Tern (II) in 1944 when the airfield was transferred to the Admiralty from RAF Coastal Command as a satellite of HMS Tern at Twatt in Orkney. It never saw any action during the war and was placed into care and maintenance in 1949. There are two nuclear sites at Lower Dounreay built on and around the site of the former airfield.

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