This nuclear reactor generates 78 MW. It consists of a highly enriched uranium core with a 2-loop pressurized water reactor. This design, designated as S4G, was used for the two reactors on the USS Triton (SSRN-586); no other ships used this reactor plant. The plant had unique design features such as horizontal steam generator U-tubes, and it was one of the only submarine plants with a deareating feed tank (DFT).