S9G reactor

The S9G reactor of the United States Navy is designed to generate electricity and propulsion for the Virginia-class attack submarines. The name S9G follows the designation scheme of platform type, generation, and the contractor.
This pressurized water reactor, developed by Knolls [Atomic Power Laboratory], features increased energy density, and new plant components, including a new steam generator design featuring improved corrosion resistance and reduced life-cycle costs. The steam generator will alleviate the corrosion concerns encountered in existing designs of steam generators, while reducing component size and weight and providing greater flexibility in overall arrangement. The reactor is designed to operate for 33 years without refueling.
This naval nuclear reactor is estimated to generate 210 megawatts a secondary steam plant delivers a combined 40,000 shaft horsepower to a single pump-jet propulsion system built by BAE Systems that was designed for the Royal Navy.