Abbreviations and Acronyms BRU Brayton Rotating Unit CBC Closed Brayton Cycle COPUOS Committee on the Peaceful Uses of Outer Space CTPC Component Test Power Converter DOD Department of Defense DOE Department of Energy DSM Design Structure Matrix EELV Evolved Expendable Launch Vehicle EP Electric Propulsion FPS Free Piston Stirling GEO Geosynchronous Orbit ISS International Space Station JPL Jet Propulsion Laboratory LEO Low Earth Orbit LFA Lorentz Force Accelerator MPD Magnetoplasmadynamic Thruster NASA National Aeronautics and Space Administration NEPA National Environmental Policy Act NEPP Nuclear Electric Propulsion and Power NERVA Nuclear Engine for Rocket Vehicle Applications NTR Nuclear Thermal Rocket OMB Office of Management and Budget PPT Pulsed Plasma Thruster PPU Power Processing Unit REP Radioisotope Electric Propulsion RTG Radioisotope Thermoelectric Generator S/C Spacecraft SEI Space Exploration Initiative SEP Solar Electric Propulsion SNAP Space Nuclear Auxiliary Power SP-100 Space Power 100 SPAR Space Power Advanced Reactor SPDE Space Power Development Engine STAR-C Space Thermionic Advanced Reactor-Compact TE Thermoelectric TEM Thermoelectric Electro Magnetic TFE Thermionic Fuel Elements TPV Thermophotovoltaic TRL Technology Readiness Level USAF United States Air Force VVEJGA Venus-Venus-Earth-Jupiter Gravity Assist 5Abbreviations and Acronyms BRU Brayton Rotating Unit CBC Closed Brayton Cycle COPUOS Committee on the Peaceful Uses of Outer Space CTPC Component Test Power Converter DOD Department of Defense DOE Department of Energy DSM Design Structure Matrix EELV Evolved Expendable Launch Vehicle EP Electric Propulsion FPS Free Piston Stirling GEO Geosynchronous Orbit ISS International Space Station JPL Jet Propulsion Laboratory LEO Low Earth Orbit LFA Lorentz Force Accelerator MPD Magnetoplasmadynamic Thruster NASA National Aeronautics and Space Administration NEPA National Environmental Policy Act NEPP Nuclear Electric Propulsion and Power NERVA Nuclear Engine for Rocket Vehicle Applications NTR Nuclear Thermal Rocket OMB Office of Management and Budget PPT Pulsed Plasma Thruster PPU Power Processing Unit REP Radioisotope Electric Propulsion RTG Radioisotope Thermoelectric Generator S/C Spacecraft SEI Space Exploration Initiative SEP Solar Electric Propulsion SNAP Space Nuclear Auxiliary Power SP-100 Space Power 100 SPAR Space Power Advanced Reactor SPDE Space Power Development Engine STAR-C Space Thermionic Advanced Reactor-Compact TE Thermoelectric TEM Thermoelectric Electro Magnetic TFE Thermionic Fuel Elements TPV Thermophotovoltaic TRL Technology Readiness Level USAF United States Air Force VVEJGA Venus-Venus-Earth-Jupiter Gravity Assist 5