Naval Reactors History Database (nrhdb)
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1Title:  S5G prototype during natural circulation reactor testing Add
 Summary:  The S5G (Narwhal prototype) plant at the Idaho National Laboratory. The S5G prototype and Narwhal plants used natural circulation in the primary loop to reduce plant noise, as an alternative to forced circulation of primary coolant using reactor coolant pumps. In this photo, the prototype plant is being floated in a tank in order to determine the effects of rolling and pitching on the reactor's operation. The S5G reator achieved initial criticality on 12 September 1965. S5G was used as a training and testing prototype by Naval Reactors until the mid-1990s 
 Source:  http://www.facebook.com/group.php?gid=45325547583 
 Reference:  Duncan, Francis. Rickover and the Nuclear Navy: The Discipline of Technology. Annapolis, Md: Naval Institute Press, 1990, pages 23-27. 
 Date:   unknown  
 Subject(s):  S5G | Naval Reactors 
 Type:  Image 
 Format:  JPEG 
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2Title:  Naval Reactors Facility at the Idaho National Laboratory Add
 Summary:  An aerial view of the Naval Reactors Facility at the Idaho National Laboratory. NRF was the site of the S1W, A1W, and S5G prototypes. The site's Expended Core Facility remains open to support the processing of spent fuel from United States naval reactors. 
 Source:  http://www.facebook.com/group.php?gid=45325547583 
 Date:   unknown  
 Subject(s):  S1W | A1W | S5G | Expended Core Facility | Naval Reactors 
 Type:  Image 
 Format:  JPEG 
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3Title:  Map showing the location of Naval Reactors Facility at the Idaho National Laboratory Add
 Summary:  This map shows a section of the Idaho National Laboratory, including the location of the Naval Reactors Facility. In 1965, NRF included the S1W and A1W prototype plants, along with the recently-built S5G prototype and the Expended Core Facility (ECF); the latter two facilities are noted on the map. 
 Source:  http://www.loc.gov/pictures/item/ID0406/ 
 Date:  11 March 1965 
 Subject(s):  S5G | Expended Core Facility | Naval Reactors 
 Type:  Image 
 Format:  JPEG 
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4Title:  Launch of the USS Narwhal at Electric Boat Add
 Summary:  The launch of the USS Narwhal, which was powered by the S5G natural circulation reactor. The Narwhal was built concurrently with the design, construction, and operation of the S5G prototype reactor at the Idaho National Laboratory. She was commissioned in June of 1969. As historian Richard Duncan notes, "although the natural-circulation reactor was successful, the navy built no more ships of [the Narwhal] class" (27). 
 Source:  http://www.navsource.org/archives/08/08671.htm 
 Reference:  Duncan, Francis. Rickover and the Nuclear Navy: The Discipline of Technology. Annapolis, Md: Naval Institute Press, 1990, pages 23-27. 
 Date:  09 September 1967 
 Subject(s):  S5G | USS Narwhal (SSN-671) | Naval Reactors 
 Type:  Image 
 Format:  JPEG 
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