SECTION I DESCRIPTION OF SPS SYSTEM SCENARIO A To assess the occupational health impacts associated with -SPS. the implementation Scenario A developed by NASA JSC in Reference 1 will be used. This system would provide 25% of the new electrical energy demand by A.D. 2015. The Scenario A program model summary of a truss SPS constructed in Low-Earth Orbit (LEO) is illustrated in Tables 1 and 2 for A.D. 2000 through A.D. 2025. Only the initial 48 10-GW SPS stations are considered in the use of resources; however, it is expected that additional stations will be implemented beyond A.D. 2025 as required. The Scenario A follows the initial 48 SPS stations through the construction, operations, and maintenance phases. Only one SPS station is built during the first2years, then SPS stations are built at one per year for 8 years, two stations per year for the following 6 years, and finally three stations per year for 9 years between A.D. 2016 and A.D. 2024. With a projected lifetime of 30 years, the first SPS station must be replaced or refurbished in A.D. 2032 and the others in sequence after this year in order to maintain the electrical power generation of 480 GW. (See Tables 1 and 2.)
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