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Proponents of the project featuring a sodium-cooled fast reactor and molten salt energy storage say it would perform better, be safer and cost less than traditional nuclear power.

The department had a fast reactor, the Experimental Breeder Reactor II, operating in eastern Idaho until it was shut down in 1994 as the nation turned away from nuclear power.

The spent fuel would be reprocessed and used in the company’s fast reactor, called Aurora.

The site of Britain's former centre of nuclear fast reactor research and development, Dounreay is in the process of being decommissioned and the land cleaned up.

In principle, such a “fast reactor” could also convert nonfissile uranium-238 to plutonium-239, which could be extracted by reprocessing the fuel.