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((Redirect|S3G))
((Refimprove|date=November 2015))

The '''S3G reactor''' is a [[United States Naval reactor|naval reactor]] used by the [[United States Navy]] to provide [[electricity generation]] and [[Nuclear marine propulsion|propulsion]] on [[warship]]s.  The S3G designation stands for:

* S = [[Submarine]] platform
* 3 = Third generation [[Nuclear reactor core|core]] designed by the contractor
* G = [[General Electric]] was the contracted designer

== Design ==
((Expand section|date=November 2016))

This [[nuclear reactor]] generates 78 [[Megawatts|MW]].  It consists of a highly [[enriched uranium]] core with a 2-loop [[pressurized water reactor]].

== History ==
This design, designated as [[S4G]], was used for the two reactors on the [[USS Triton (SSRN-586)|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 [[deaereating feed tank]] (DFT).
[[File:S3G prototype at the Kesselring Site.jpg|thumb|S3G prototype under construction at the Kesselring Site, to be operational August 1958]]
A prototype reactor was built ashore at [[Knolls Atomic Power Laboratory]]'s Kesselring Site in [[Milton (town), New York|West Milton, New York]] in 1958 to test the reactor design.<ref>((cite web |date=July 2, 2016 |title=S3G Nuclear Submarine Prototype |url=http://www.globalsecurity.org/military/systems/ship/systems/s3g.htm |accessdate=2009-06-06 |website=[[GlobalSecurity.org]]))</ref><ref>((Cite web |last=Staulters |first=Karen |date=May 15, 2020 |title=Kesselring Atomic Power Labratory: A Short History |url=https://www.newyorkalmanack.com/2020/05/kesselring-atomic-power-labratory-a-short-history/ |website=New York Almanack |language=en-US))</ref> Once the design was proven, the prototype continued operation to train students and test new systems and materials. This prototype training reactor was taken off line in 1992 and subsequently decommissioned.

Although the design of the entire S3G reactor plant (core, piping, pumps, etc.) saw only limited use, a design version of the reactor core ("S3G3" or "S3G core 3") was later used for replacement cores for the Navy's 100 [[S5W reactor]] plants when refueled. Another unique feature of the S3G core 3 was the use of Y-shaped control rods versus the standard [[cruciform]] control rods used in the S5W core. The core also utilized a rod configuration called "skewed divergent" for ease of maintenance.

The S3G prototype was located at West Milton, N.Y. and consisted of a submarine reactor unit, engine compartments and a few office spaces. There were airlocks at each end of the containment hull and a negative atmospheric pressure was maintained in the unit. The negative pressure was to ensure that any gasses released into the prototype wouldn't escape into the local environment. It was a large cylinder painted green and was called "The Green Weenie" by the students stationed there.
==References==
((reflist))

((United States Naval reactor))

[[Category:United States naval reactors]]

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