Subsequent sections present more detailed cost information associated with each program cost item shown in Table 5.2-1. The level of detailed cost data provided was governed somewhat by the relatively short time frame of the study. Time did not permit going out to prospective suppliers to obtain their cost estimates of certain key elements of the satellite. Instead, it became necessary in many cases to derive these costs from industry documents developed under previously funded, longer duration studies. Also, cost of certain elements of the program were developed in more detail than others, depending on the level of study emphasis and as time permitted (e.g., the satellite subsystem costs were developed to WBS Level 6 and summarized and reported to WBS Level 5, whereas each vehicle of the space transportation system was costed on a vehicle-by-vehicle basis, WBS Level 4). Costing Ground Rules and Assumptions The major ground rules and assumptions considered for the purposes of costing the satellite power system were as follows: • All costs normalized to GFY 1976 dollars • 30-year production and construction program • 120 satellites required 27.27 x 106 kg/SPS (60 x 106 lb) Satellite construction rate of 4 per year • Assumed 85-percent Wright learning curve 120 satellites 231 earth launch vehicles 192 orbital transfer vehicles 5 crew and resupply modules • Crew rotation every 90 days Costing Objectives and Approach The principal costing objectives of the study were the following: • Develop an SPS program cost estimate of all elements of the SPS system, including nonrecurring and recurring costs for each element. • Establish a cost relationship between the satellite and the ground support systems, space transportation and the orbital construction base.
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