1. The nuclear thermionic system was not technically feasible (with the molten salt breeder reactor) because radiator pumping power requirements exceeded the power output. 2. The nuclear Brayton system was most massive because the low molten salt breeder reactor temperatures resulted in a low temperature (hence massive) radiator. 3. The thermionic/Brayton cycle was lightest, but most complex. 4. The power relay system (geosynchronous mirrors) had a high probability of severe environmental impact. System masses, costs, and launch pollutants were estimated for all systems. PRELIMINARY OVERALL STUDY RESULTS At this point in the study, the following primary conclusions can be drawn regarding power satellites: 1. At least three approaches to power generation in space appear to be practical. 2. These systems have masses of approximately 108 kg for 10 GW ground output capability. 3. In a significant program (at least 300 GW total capability), power costs (busbar) can be approximately 40 mill/kWh (1976 dollars).
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