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The S2Wa reactor is a naval reactor used by the United States Navy to provide electricity generation and propulsion on warships. The S2Wa designation stands for:

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

After the predictable problems arose with the S2G's use of 347 Stainless Steel caused by the sodium in the liquid sodium reactor in its superheater[1] the USS Seawolf (SSN-575) had her S2G liquid metal cooled reactor replaced using the spare S2W built for the USS Nautilus. During the conversion, the steam turbines in the powerplant were also re-bladed to utilize saturated, rather than superheated, steam.


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