system (rectenna) costs. The satellite hardware costs were determined using the cost estimating relationships (CER's) and satellite weight characteristics given in section IV. A range of costs was determined based on satellite weight, satellite configuration and construction location (LEO or GEO), and unit cost of solar cells varying from $100 to $500/kW. The cost of satellite construction was based on requirements delineated in section V. This cost item includes space construction facilities and equipment and space construction personnel. The space construction facilities are to house construction personnel and equipment and are located in LEO and GEO, as required by the particular construction location and configuration. The costs of these facilities were prorated over the number of satellites constructed because they are reusable. The facilities were estimated at the rate of $250/kg recurring hardware cost. The space transportation costs and cost variables are discussed in detail in section VI. The transportation cost per SPS was determined by summing the total space transportation cost for 112 satellites and dividing by 112 to reflect the reusability of launch and orbit transfer vehicles. The rectenna costs were based primarily upon the recurring costs of diodes, circuits, and the support structure. Unit costs utilized are given in section IV. As indicated in figure XI-1, a plant lifetime of 30 years was assumed in the computation of capital recovery rate. Also, a fixed rate of return of 15 percent for principal, interest, taxes, and insurance was utilized in all cases. The SPS plant factor utilized was 0.92, which is based on an average downtime of 4 weeks/yr for maintenance and repair. This downtime period would include the loss of power during the brief eclipse periods. 0&M costs.- The primary operation of SPS will be conducted from the ground receiving station. It is anticipated that routine, but infrequent, "onboard" monitoring and inspection may also be required. This may be accomplished by a crew that services several SPS's, thus reducing the costs attributable to a single SPS. As a baseload power system, SPS will be designed to operate at full capacity year round. It is anticipated, however, that scheduled shutdowns of several days' duration will be required annually to replace or repair failed or malfunctioning components (klystron tubes, solar array blanket sections, etc.). In such cases, an HLLV and the selected COTV concept could be scheduled to deliver the hardware. Personnel and consumables would be delivered by the personnel transportation vehicles. Preliminary estimates of annual 0&M costs were based on the following assumptions:
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