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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 (SSN-579) [1] and USS Seadragon (SSN-584) [2].


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