S3G reactor - Definition

The S3G reactor is a type of United States Naval reactor, used to drive a submarine.

This type of nuclear reactor generates 78 MW; it is a highly enriched uranium core, 2 loop pressurized water reactor.

It was in service aboard the USS Will Rogers, a Polaris/Poseidon missile submarine of the United States Navy, and also aboard USS Gato (SSN-615) and possibly also in USS Triton (SSN-586).

Once decommissioned, one of the two reactors aboard the latter submarine is said to have been put in service as a prototype to train students and test systems and materials at Knolls Atomic Power Laboratory in Ballston Spa, New York.