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HMS Dreadnought (S101)



{| border="1" align="right" cellpadding="2" cellspacing="0" width="300" |colspan="2"| |- !style="color: white; height: 30px; background: navy no-repeat scroll top left;"|Career !style="color: white; height: 30px; background: navy no-repeat scroll top left;"| |- |Ordered: | |- |Laid Down: |12th June 1959 |- |Launched: |21st October 1960 |- |Commissioned: |17 April 1963 |- |Decommissioned: |1980 |- |Fate: |As of 2004, is laid up at Rosyth |- !colspan="2" align="center" style="color: white; height: 30px; background: navy no-repeat scroll top left;"|General Characteristics |- |Displacement: |3,500 tons surfaced/4,000 tons dived |- |Length: |265.7 ft (81 m) |- |Beam: |31.2 ft (9.8 m) |- |Draught: |25.9 ft (7.9 m) |- |Propulsion: | One Rolls Royce / Westinghouse S5W reactor, two steam turbines, one shaft, 15000 hp (11 MW) |- |Speed: |20 knots surfaced/28 knots dived |- |Range: | |- |Complement: |113 |- |Armament: |6 x 21-in torpedo tubes (All located at the bow. 24 torpedoes in total) | |} The fourth '''HMS ''Dreadnought'' (S101)''' was the United Kingdom's first nuclear-powered submarine, built by Vickers of Barrow-in-Furness. In 1955 the United States Navy completed USS Nautilus (SSN-571), the world's first nuclear-powered submarine. During subsequent exercises with the Royal Navy, ''Nautilus'' ran rings round British anti-submarine forces, who had developed extensive anti-submarine warfare techniques during the Second Battle of the Atlantic. The Admiralty decided to build nuclear-powered submarines. Instead of developing an all-British nuclear submarine, much time and money would be saved by accepting the American lead and taking advantage of US nuclear technology. The excellent relations between Admiral Lord Louis, Earl Mountbatten, the First Sea Lord, and Rear Admiral Hyman Rickover, in charge of the American naval nuclear power program, expedited obtaining that help. ''Dreadnought'' was thus assembled from American parts in a Vickers-built hull. In particular, the reactor compartment and engineroom are almost entirely of US Navy design and construction and are known as the "American Sector". ''Dreadnought'' was laid down on 12 June 1959, and ship naming and launching by Elizabeth II of the United Kingdom on Trafalgar Day, 21 October 1960. ''Dreadnought'' made her first dive, in Ramsden Dock, on 10 January 1963. At the time of her ship commissioning on 17 April 1963, she was one of the most formidable attack submarines in the world. In the mid-1960s, Dreadnought's visits included trips to Norfolk, Virginia, Bermuda, Rotterdam, and Kiel. She was at Gibraltar in 1965, 1966, and 1967, and on 19 September 1967, she left Rosyth, Scotland for Singapore on a sustained high-speed run. The round trip finished as 4640 miles surfaced and 26545 miles submerged. During her career, ''Dreadnought'' performed many varied missions. On 24 June 1967, she was ordered to sink the wrecked and drifting German ship ''Essberger Chemist''. Three torpedoes hit along the length of the target, but the gunners of HMS Salisbury finished the job by piercing the tanks, which were keeping ''Essberger Chemist'' just afloat. Apart from minor hull-cracking problems, ''Dreadnought'' proved to be a reliable vessel, popular with her crews. On 10 September 1970, she completed a major refit at Rosyth, Scotland, in the course of which her nuclear core was refuelled and her ballast tank valves were changed to reduce noise. On 3 March 1971, ''Dreadnought'' became the first British submarine to surface at the North Pole. In 1973 she took part in the Royal Navy's first annual Group Deployment, when a group of warships and auxiliaries would undertake a long deployment to maintain fighting efficiency and "show the flag" around the world. Together with the frigates HMS Alacrity and HMS Phoebe, ''Dreadnought'' was deployed to the South Atlantic in 1977 to deter possible Argentina aggression against the Falkland Islands. Due to machinery damage and the limited refit facilities then available for SSNs, ''Dreadnought'' was withdrawn from service in 1980.
''Dreadnought'' is now at Rosyth Naval Dockyard, laid up indefinitely while her radioactive contamination decays. Her nuclear fuel has been removed and she has been stripped of useful equipment. During Dreadnought's construction, Rolls Royce and Associates, in collaboration with the United Kingdom Atomic Energy Authority, developed a completely new nuclear propulsion system. On 31 August 1960, the UK's second nuclear-powered submarine was ordered from Vickers and, fitted with Rolls Royce's nuclear steam-raising plant, HMS Valiant (S102) was the first all-British nuclear submarine. See HMS Dreadnought for other ships of the name. Royal Navy submarines


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