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背景资料“汉”级核潜艇是中国人民解放军海军的首级核动力攻击潜艇,共建造了5艘。中国的核动力潜艇研发始于上世纪50年代后期,第一艘完成的就是“汉”级401号艇。艇体为典型的水滴型双壳体构造,动力系统采用压水反应堆、蒸汽轮机和电力推进方式。由于401号与402号艇曾在航行噪声等方面出现问题,3号艇之后(403～405号)作出相应改进,艇体进行了加长。401号与402号艇已于2005年退役,其他3艇都作出了大量更新与改装,换上了新的声呐和消声瓦等。
Background information “Han ” class nuclear submarine is the first class nuclear-powered attack submarine of the Chinese People’s Liberation Army Navy, built a total of five. The research and development of China’s nuclear-powered submarines started in the late 1950s. The first one completed was the “Han” class 401 boat. Hull is a typical drip-type double-shell structure, the power system uses pressurized water reactors, steam turbines and electric propulsion. As No. 401 and No. 402 boats had problems with navigation noise and so on, after No. 3 (No. 403 to No. 405) improvements were made and the hull was lengthened. 401 and 402 boats have been retired in 2005, the other three boats have made a lot of updates and modifications, put on a new sonar and anechoic tiles and so on.