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The S4W reactor is a naval reactor used by the United States Navy to provide electricity generation and propulsion on warships. The S4W designation stands for:
This nuclear reactor was a variant of the Submarine Fleet Reactor (SFR) with the horizontal steam generators pioneered in S1W and S2W.
Two boats of the Skate class were built with S4W reactors: USS Swordfish (SSN-579) [1] and USS Seadragon (SSN-584) [2]. During later overhauls, the S4W reactors in both subs were replaced with S5W reactors [3].
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