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Naval Reactors (4)
USS Seawolf (SSN-575) (4)
S2G (3)
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Rickover, Hyman G. (1)
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1974 (1)
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1Title:  The USS Seawolf underway Add
 Summary:  The USS Seawolf underway in 1977. During her early years of operations in the late 1950s, the Seawolf was powered by an S2G (sodium-cooled, intermediate range) reactor plant designed by General Electric. Because of difficulties in operating this plant and the demonstrated superiority of the pressurized water reactor (PWR) design, the Seawolf's sodium-cooled plant was removed and replaced with an S2W PWR plant at Electric Boat in 1958-60. 
 Source:  http://en.wikipedia.org/wiki/File:USS_Seawolf_%28SSN-575%29.jpg 
 Reference:  Polmar, Norman. Atomic Submarines. London: Van Nostrand, 1963, pages 106-109. 
 Date:  18 October 1957 
 Subject(s):  S2G | USS Seawolf (SSN-575) | Naval Reactors 
 Type:  Image 
 Format:  JPEG 
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2Title:  USS Seawolf at launching - Submarine Intermediate Range (SIR) reactor Add
 Summary:  The second commissioned nuclear-powered submarine was the USS Seawolf. At the time of her commissioning in March 1957, the Seawolf was powered by an S2G reactor plant, which followed the design and construction of the S1G land-based prototype plant. The plant used sodium as the coolant and beryllium as a moderator and reflector. One important advantage of using sodium as the coolant and heat transfer medium is that higher coolant and secondary steam temperatures are possible, which results in higher thermal efficiency. Additionally, the primary system can be maintained at a reliatively low pressure. Both of these factors enabled primary and secondary components to be lighter (compared with those installed in a pressurized water reactor plant). However, operation of the S1G and S2G plants revealed severe design problems, including primary-to-secondary leakage (and the potential of sodium reacting with water in the secondary system). In 1959, the Seawolf's S2G plant was removed and replaced with an S2Wa pressurized water reactor plant. 
 Source:  http://www.navsource.org/archives/08/08575a.htm 
 Reference:  Ragheb, Madgi. Nuclear Marine Propulsion. 20 July 2011 [http://tinyurl.com/3fm3azu]. 
 Date:  21 July 1955 
 Subject(s):  S2G | USS Seawolf (SSN-575) | Naval Reactors 
 Type:  Image 
 Format:  JPEG 
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3Title:  The USS Seawolf sodium-cooled reactor Add
 Summary:  The text of a May 2012 speech by Eric Loewen of the American Nuclear Society, which focused on the sodium cooled intermediate range reactors designed and developed by General Electric for naval propulsion. While there are some errors in the text, Loewen describes sodium cooled reactor technology and components such as electromagnetic pumps. He provides some unique insights into the construction of the S1G and S2G naval plants. Similar to the Manhattan Engineer District project, the development of naval nuclear propulsion followed a parallel path with the Pressurized Water Reactor (PWR), developed by Westinghouse and the sodium cooled, Submarine Intermediate Rector (SIR), developed by General Electric. Loewen notes that the SIR offered two important advantages: "the sodium cooled knowledge base was further advanced than the PWR, and the sodium cooled reactor did have higher steam cycle efficiency" (3). He also describes some of the weaknesses of the SIR reactor, including the use of 347 stainless steel (347SS) in the superheaters and the "adverse affects of sodium" upon 347SS. Bypassing the superheaters led to higher-than-expected uranium depletion as the plant operated with lower steam temperatures and pressures (5). In reviewing the Soviet navy's use of liquid metal cooled plants, Loewen notes another weakness of the SIR: external heaters must keep the primary loop warm during reactor shutdown periods in order to keep the coolant from solidifying. Errors include the power rating of the Shippingport civilian power plant (initial rating, 60 MW) and the moderator for the S1G and S2G plants (which were beryllium, not carbon). 
 Source:  http://www.new.ans.org/about/officers/docs/seawolf_sfr_sea_story_051712.pdf 
 Date:  17 May 2012 
 Subject(s):  S1G | S2G | USS Seawolf (SSN-575) | Naval Reactors 
 Type:  Text 
 Format:  PDF 
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4Title:  Nuclear navy, 1946-1962 Add
 Summary:  The foundational history of the Naval Nuclear Propulsion Program, covering the period of the program's creation, under the leadership of Hyman G. Rickover, to 1962, by which time the United States Navy's fleet included nuclear-powered attack submarines, ballistic missile submarines, and surface ships. The program's leadership in support of the Shippingport Atomic Power Station is also chronicled. 
 Source:  http://energy.gov/management/downloads/hewlett-and-duncan-nuclear-navy-1946-1962 
 Date:   1974 
 Subject(s):  Naval Reactors | Rickover, Hyman G. | S1W | USS Nautilus (SSN-571) | S1G | USS Seawolf (SSN-575) 
 Type:  Text 
 Format:  PDF 
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