Radioisotope Power Systems An Imperative for Maintaining U.S. Leadership in Space Exploration (2009) / Chapter Skim
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4 RPS Research and Development
4 RPS Research and Development
Pages 24-30
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From page 24... ...
• The technology portfolio supports, at a low level, • Advanced Stirling Radioisotope Generator (ASRG) research and development for additional converter flight system development is led by the DOE and sup ported by GRC.
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From page 25... ...
, the manufacture of be at least 15 percent, so that a TPV RPS powered GPHS RTGs was discontinued, and it would be very difficult Figure 4-1 Tech Portfolio Small RPS Sustaining LAE ASC Technology Maturation for ASRGs ASRG Development Management Actual Budget Budget Request FIGURE 4.1 Relative magnitude of key elements of NASA's radioisotope power system program. NOTE: Actual budget shown for fis cal year (FY)
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From page 26... ...
GPHS-RTG MMRTG ASRG ARTG TPV Past Present In Development Future Future Electric Output, BOM, We 285 125 ~140-150 ~280 to 420 ~38-50 Heat Input, BOM, We 4500 2000 500 3000 250 RPS System Efficiency, BOM, % 6.3 6.3 ~28-30 ~9-14 ~15-20 Total System Weight, kg 56 44.2 ~19-21 ~40 ~7 Specific Power, We/kg 5.1 2.8 ~7-8 ~7-10 ~6-7 Number of GPHS Modules 18 8 2 12 1 GPHS Module Weight, kg 25.7 12.9 3.2 19.3 1.6 238Pu Weight, kg 7.6 3.5 0.88 5.3 0.44 FIGURE 4.2 Performance of past, present, and future radioisotope power systems. NOTE: ARTG, Advanced Radioisotope Thermal G enerator; ASRG, Advanced Stirling Radioisotope Generator; BOM, beginning of mission; GPHS, general purpose heat source; MMRTG, Multi-Mission Radioisotope Thermoelectric Generator; RTG.
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From page 27... ...
NASA's Science Mission Directorate Orbiter, which would be powered by solar arrays. Saturn is generally expects new technology to advance to technology almost twice as far from the Sun as Jupiter, and the TSSM readiness level 6 or beyond before the mission's preliminary mission would last 13 years, somewhat longer than the EJSM design review. With regard to ASRGs, NASA is responsible mission (9 years)
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From page 28... ...
Still, the reliability identification, characterization, and mitigation to reduce risk of ASCs and ASRGs over a 17-year design life remains to a level that is acceptable for a flight mission. As part of its unknown, in part because of design differences between ASCs ongoing reliability improvement and risk reduction efforts, and most cryocoolers with long-life experience in space. the RPS program has produced five ASC models.
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From page 29... ...
are flight ready when the project manager for that mission says they are flight ready. Given this situation, ongoing efforts to advance ASRG technology and demonstrate that RPS Facilities it is flight ready are being guided by experience with past NASA appears currently to be well positioned with regard programs and researchers' best guess about the needs and to key RPS research and development facilities.
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From page 30... ...
NASA and the Department of Energy should of flight-readiness requirements for RPSs in general and complete the development of the Advanced Stirling RadioAdvanced Stirling Radioisotope Generators in particular, as isotope Generator (ASRG) with all deliberate speed, with the well as a plan and a timetable for meeting the requirements.
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