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The Sierra I class (NATO reporting name) or (Soviet design serial number) Project 945 (''Барракуда/Barrakuda'') nuclear submarine was the Soviet Union's successor class to the partly successful Project 705 ''Lira'' (Alfa) class submarine. The Sierra class has a light and strong titanium pressure hull which enables the class to dive to greater depths, reduce the level of radiated noise and increase resistance to torpedo attacks. It is powered by a single OK-650 pressurized water reactor. Sierra I and its successor Sierra II classes submarines are designed by (Lazurit Central Design Bureau ) The Sierra II class (NATO reporting name) or Project 945A (''Кондор/Kondor'') nuclear submarine was a successor to the Sierra I with improved quieting and sonar.〔Norman Polamr and K. J. Moore, 'Cold War Submarines,'〕 The Sierra II was specifically developed for search and destroy missions against US nuclear submarines. It has a smaller turning circle than any other modern submarine, with speeds and diving depth greater than its American counterparts. ==Sierra I== The first hull, ''Karp'', was laid down in May 1982 at the Gorky shipyard and was launched in August 1983 before being transferred to Severodvinsk for fitting out. It was laid up in 1987. The next hull to be built was the ''Kostroma'', which was launched in July 1986 and was commissioned in September 1987. ''K-276 Kostroma'' was put into a drydock after its February 11, 1992 collision with in the Barents Sea, off Kildin Island.〔http://web.archive.org/web/20061002201930/http://www.system-safety.org/~issc_2006/Shaw-awards%20dinner%20thursday.pdf〕 The submarine was repaired on 29 June 1992 and was renamed ''Krab'', but in 1996 its original name was returned and it is still in service with the Russian Northern fleet. The Sierra I class was also fitted with a releasable escape pod for the crew. The pod is covered by a V shaped casing on the port side of the sail. Soviet titanium technology was far in advance of the West's, requiring fewer passes to achieve weld at the disadvantage of the cost of each hull which limits numbers built despite the advantages of greater depths and underwater speed. This was clearly shown in the Sierra class. On March 5, 2013 the Russian news agency ''Izvestiya'' reported that the Russian Navy has decided to return Hull 1 ''Karp'' and Hull 2 ''Kostroma'' to service. The necessary upgrade work is expected to take 3 years and will be carried out at Severodvinsk.〔(【引用サイトリンク】title=Russia to Resurrect Titanium Submarines | Defense | RIA Novosti )〕 Submarines in class: Plan to upgrade the two ships on the CA "Zvezdochka" on the project 945M〔http://flotprom.ru/news/?ELEMENT_ID=139706〕 * B-239 Carp - commissioned 1987, laid up 1997, being reactivated by 2017 * - commissioned Sep 1987, active 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sierra-class submarine」の詳細全文を読む スポンサード リンク
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