The S4G reactor is a naval pressurized water reactor used by the United States Navy to provide electricity generation and propulsiononwarships. The S4G designation stands for:
This nuclear reactor is the shipboard equivalent of the S3G reactor. It was installed in a dual-configuration on USS Triton with two reactors and two five-blade propellers, which was the first ship to make a submerged circumnavigation of the world. As installed in USS Triton the two S4G's were rated for a combined 78 MW (105,000 hp).[1]
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