laid up indefinitely at Rosyth Naval Dockyard upon decommissioning while her radioactive contamination decayed. Her nuclear fuel was removed and she was stripped of useful equipment.
During Dreadnought's build, Rolls Royce and Associates, in collaboration with the United Kingdom Atomic Energy Authority, were developing a completely new nuclear propulsion system. On 31st August, 1960, Britain's second nuclear-powered submarine was ordered from Vickers and, fitted with Rolls-Royce's nuclear steam-raising plant, Valiant was the first all-British nuclear submarine.
