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The S8G reactor is a naval reactor used by the United States Navy to provide electricity generation and propulsion on warships. The S8G designation stands for:

This nuclear reactor utilizes natural circulation [1][2][3] which is capable of operating at a significant fraction of full power without reactor coolant pumps.

The S8G reactor was designed by General Electric for use on the Ohio class (SSGN/SSBN-726 class) submarines. A land-based prototype of the reactor plant was built at Knolls Atomic Power Laboratory in Ballston Spa, New York. The prototype was used for testing and crew training throughout the 1980s. In 1994, the core was replaced with an S6W reactor, designed for the then-new Seawolf class submarine.

The prototype is equipped with a high speed reactor fill system that can flood the reactor compartment with borated water in the event of a loss of coolant accident.


  1. ^ "Энциклопедия кораблей /Ракетные ПЛ /Огайо" (in Russian). Retrieved 2006-03-12.  
  2. ^ "The Ohio, US Navy's nuclear-powered ballistic missile submarine". Retrieved 2006-03-12.  
  3. ^ " Equipment Guide (registration required)". Retrieved 2006-03-12. "...relying on...natural circulation reactor...."  


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