The PLUTO reactor, short for "Plutonium Reactor," was a type of research reactor that operated in the United Kingdom. It was specifically designed for the production of plutonium and for research purposes. The reactor was established at the UK Atomic Energy Authority's (UKAEA) Dounreay site in Scotland, and it became operational in the late 1950s. PLUTO was a fast reactor that used a sodium coolant and was notable for its role in developing fast breeder reactor technology.
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