- 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 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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