launching nuclear material. NASA regulations require an environmental impact statement (EIS) for missions carrying nuclear material. Over the years, the DOE has established an extensive data base on the response characteristics of isotope power systems to various accident environments. In addition, a body of analytical techniques has also grown to extend the range of the existing data base. A similar body of test data and analytical techniques must also be developed for space reactor systems. Each system, isotope or reactor, has advantages for specific applications. The key factor is that the design, from start to finish, must be sensitive not only to operational criteria but also to safety. Isotope systems have demonstrated achievement of their design goal of full-fuel-containment in case of mission anomalies; reactor systems have to develop the verification testing program to provide the same confidence. (Paper number IAF-ICOSP89-11-5.) 12. SPACE POWER MISSIONS APPLICATIONS II 12-3. On-orbit Assembly & Growth of Space Station Freedom Power Systems Matthew Fisk Marshall, Miles K. Yano & Gilbert D. Drucker Rockwell International Corporation, California, USA. This paper focuses on the challenges of on-orbit assembly and growth as applied to the Space Station Freedom power system. On-orbit assembly discussions include designing for assembly versus the full up configuration and the associated tradeoffs, incremental build-up in the electrical power system to meet Freedom assembly requirements, on-orbit performance during the assembly sequence, dynamics associated with the addition of power generating modules to the orbital configuration, the constraints of the space shuttle system on assembly, and the fact that a completely operational spacecraft must be left at the end of each assembly mission. The space station power system is indicative of future systems that will have operational lifetimes of decades (at least 30 years for the space station). These long-life power systems must be designed to take advantage of opportunities to grow in capacity and capability to meet the evolving needs as well as to take advantage of technology upgrades and advancements. Tradeoffs establish what level of flexibility and transparency the power system will incorporate to take advantage of advancing technologies, and what hardware ‘scars' and software ‘hooks' will be designed into the baseline to provide for growth beyond the initial operational configuration. (Paper number IAF-ICOSP89-12-3.) 12-4. Space Station Freedom Growth Power Requirements B. D. Meredith', P. R. Ahlf & R. J. Saucillo2 'NASA Langley Research Center, Hampton, VA 23665, USA; 2McDonnell Douglas Astronautics Company, Washington Operations Division, Rockville, MD 20850, USA. The Space Station Freedom Program conducted its Preliminary Requirements Review (PRR) last year to initiate the design and development phase of the program. The objective was to adopt a consistent set of system requirements, thereby allowing the work package centers and contractors to proceed with the development of preliminary designs for the various elements and systems. The Space Station Freedom Office at Langley Research Center (LaRC) has the responsibility for leading an integrated, agency-wide program to develop design requirements and system concepts for Station evolution. In that capacity, key resource and design requirements for growth were identified and advocated to the program at PRR. Mission and systems analyses were performed to identify growth requirements for electrical power and other critical resources onboard Space Station (e.g. crew, pressurized volume). This paper will present results of those analyses and recommendations made for electrical power system growth.
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