A new photovoltaic baseline will be established when the previously mentioned analyses are complete. Included will be the interaction of various elements of the SPS in order to minimize the overall mass and cost of the SPS program. 11.2 SOLAR THERMAL Most of the study activity for the solar thermal concept assumed 544 individual absorber/turbomachine modules. Preliminary analyses and trade studies have been completed. They indicate that the total SPS mass could be reduced by approximately 20 percent if the number of modules was decreased to approximately 50. This was primarily due to the mass of the turbomachines. Other analyses indicate potential mass savings if the radiators were placed near the absorber rather than included on the back surface of the concentrator. Additional analysis is underway in other areas and, when completed, a new baseline will be generated. 11.3 NUCLEAR The study activity for the nuclear concept has switched to a UF6/ Brayton concept because of limitations in the molten salt breeder reactor which required a low temperature radiator. This caused this type of satellite to be the most massive of any concept studied.
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