The S4W reactor is a naval reactor plant used by the United States Navy to provide electricity generation and propulsion on warships. The S4W designation stands for:
- S = Submarine platform
- 4 = Fourth generation core designed by the contractor
- W = Westinghouse was the contracted designer
This nuclear reactor plant utilized an S3W reactor in an alternate equipment arrangement.
Two boats of the Skate class were built with S4W reactor plants: USS Swordfish[1] and USS Seadragon.[2]
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