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The S2W reactor is a naval reactor used by the United States Navy to provide electricity generation and propulsion on warships. The S2W designation stands for:

  • S = Submarine platform
  • 2 = Second generation core designed by the contractor
  • W = Westinghouse was the contracted designer

This nuclear reactor is the shipboard equivalent of the prototype S1W reactor, with minor design changes, that was installed on the USS Nautilus (SSN-571). As installed in Nautilus it generated 13,400 horsepower (10.0 MW). It was originally designated STR.[1]

After Nautilus was decommissioned, the reactor equipment was removed. The submarine is now moored and displayed as a museum ship at the Naval Submarine Base New London in Groton, Connecticut.


  1. Norman Polmar, Kenneth J. Moore. Cold War submarines: the design and construction of U.S. and Soviet submarines. Brassey's. 

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