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Cold-end Subsystem Testing for the Fission Power System Technology Demonstration UnitThe Fission Power System (FPS) Technology Demonstration Unit (TDU) consists of a pumped sodium-potassium (NaK) loop that provides heat to a Stirling Power Conversion Unit (PCU), which converts some of that heat into electricity and rejects the waste heat to a pumped water loop. Each of the TDU subsystems is being tested independently prior to full system testing at the NASA Glenn Research Center. The pumped NaK loop is being tested at NASA Marshall Space Flight Center; the Stirling PCU and electrical controller are being tested by Sunpower Inc.; and the pumped water loop is being tested at Glenn. This paper describes cold-end subsystem setup and testing at Glenn. The TDU cold end has been assembled in Vacuum Facility 6 (VF 6) at Glenn, the same chamber that will be used for TDU testing. Cold-end testing in VF 6 will demonstrate functionality; validated cold-end fill, drain, and emergency backup systems; and generated pump performance and system pressure drop data used to validate models. In addition, a low-cost proof-of concept radiator has been built and tested at Glenn, validating the design and demonstrating the feasibility of using low-cost metal radiators as an alternative to high-cost composite radiators in an end-to-end TDU test.
Document ID
Document Type
Technical Memorandum (TM)
Briggs, Maxwell
(NASA Glenn Research Center Cleveland, OH, United States)
Gibson, Marc
(NASA Glenn Research Center Cleveland, OH, United States)
Ellis, David
(NASA Glenn Research Center Cleveland, OH, United States)
Sanzi, James
(Vantage Partners, LLC Brook Park, OH, United States)
Date Acquired
April 8, 2014
Publication Date
August 1, 2013
Subject Category
Fluid Mechanics And Thermodynamics
Energy Production And Conversion
Report/Patent Number
Meeting Information
Meeting: ANS Nuclear and Emerging Technologies for Space (NETS 2013) Topical Meeting
Location: Albuquerque, NM
Country: United States
Start Date: February 25, 2013
End Date: February 28, 2013
Sponsors: Aerojet-General Corp., American Nuclear Society
Funding Number(s)
Distribution Limits
Public Use Permitted.
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