AAE450 Senior Spacecraft Design Courtney Rogge Week 2: January 25 th, 2007 Power Nuclear Power Capabilities.

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AAE450 Senior Spacecraft Design Courtney Rogge Week 2: January 25 th, 2007 Power Nuclear Power Capabilities

AAE450 Senior Spacecraft Design Nuclear Power Needs –Safe, Reliable Power Source –Space Transportation & Surface Applications Nuclear Options –Nuclear Dynamic Power Conversion –Radioisotope Thermoelectric Generators (RTG) –Stirling Radioisotope Generators (SRG) Power Source Power Conversion Power Management & Distribution (PMAD)

AAE450 Senior Spacecraft Design Nuclear Power Capabilities Robert Abelson, et al; Ref. 4 Lee Mason; Ref. 5

AAE450 Senior Spacecraft Design Backup Slides

AAE450 Senior Spacecraft Design Power Sources and Budget

AAE450 Senior Spacecraft Design Radioisotope Thermoelectric Generator (RTG) Figure based on RTG Parametric Model S. Freedman, J. Friedman, J. Schmieder, p16; Ref. 1 Fuel: Pu-238 Half-life ~ 87.7yrs Fins for heat radiation Thermopile and end form closed circuit Stirling Radioisotope Generator (SRG) Radiator Fin Gen Purpose Heat Source (GPHS) Stirling Converter Generator Housing Radiator Fin Figure based on Schmidt, Wiley and Furlong, slide17; Ref. 2

AAE450 Senior Spacecraft Design Brayton Conversion Cycle Figure based heavily on Lee Mason, et al. Ref. 3 Reactor Heat Source Turboalternator PMAD RadiatorGas Cooler LoadsRadiator

AAE450 Senior Spacecraft Design Nuclear Dynamic Power Conversion Lee Mason; Ref. 5

AAE450 Senior Spacecraft Design Considerations SRG –In development –4 times less fuel than RTGs (Schmidt et al, Ref. 2) –Projected readiness in 2008/2009 (Schmidt et al, Ref. 2) Nuclear Reactors –SAFETY –Radiation, Maintenance –Don’t want Martian Chernobyl –Don’t want to make Africa glow in the dark if a launch is aborted

AAE450 Senior Spacecraft Design References 1.Freedman, S., and J. Friedman and J. Shmieder. RTG Parametric Study Report for the RTG Study Voyager Task C (U). Valley Forge Space Technology Center; Philadelphia Schmidt, George and Richard Wiley and Robert Furlong. Radioisotope Power Systems for New Frontiers: Presentation to New Frontiers Program Pre-proposal Conference. NASA, Dept of Energy; 13 Nov Mason, Lee. A Comparison of Fission Power System Options for Lunar and Mars Surface Applications. Glenn Research Center; Feb 2006.

AAE450 Senior Spacecraft Design References 4.Abelson, Robert D., Ed. Expanding Frontiers with Standard Radioisotope Power Systems. JPL, NASA, California Institute of Technology; 12 Jan Mason, Lee. A Comparison of Brayton and Stirling Space Nuclear Power Systems for Power Levels from 1 Kilowatt to 10 Megawatts. Glenn Research Center; 2001.