Naval Reactors History Database (nrhdb)
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1Title:  Stern view of USS Nautilus Add
 Summary:  The USS Nautilus underway in Long Island Sound in May 1955, eight months after her commissioning. 
 Source:  http://www.history.navy.mil/Special%20Highlights/Nautilus/nautilus2.htm 
 Date:   1955 
 Subject(s):  S2W | USS Nautilus (SSN-571) | 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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