The S6W reactor is a naval reactor used by the United States Navy to provide electricity generation and propulsion on warships. The S6W designation stands for:
This pressurized water reactor was prototyped in the land-based S8G plant at Knolls Atomic Power Laboratory's Kesselring Site in West Milton, NY starting in March 1994. It has a shaft horsepower of 45,000 shp.
The three ships of the Seawolf class USS Seawolf (SSN-21), USS Connecticut (SSN-22), and USS Jimmy Carter (SSN-23) submarines were built with S6W reactors.