50% such that for every kilogram of propellant required at GEO for POTV[_ refueling, 1.5 kilograms must be delivered to LEO by the HLLV, and subsequently, the COTV|_ must deliver 1.2 kilograms to the GEO depot tank farm. Additional study and refinement of requirements is required in this area and will be provided by a proposed JSC FY77 contracted study titled "Orbital Propellant Transfer and Storage Systems for Large Space Programs." Computer Output Data Annual and total 30 year program runs were completed for three SPS construction concepts: Concept 1 - Column/cable SPS constructed at GEO Concept 2 - Truss SPS constructed at GEO Concept 3 - Truss SPS constructed at LEO Year 2024 Totals - The following computer printout tables represent the space transportation activity and costs related to "Construction Only" (Table VI-F-1) and "Repair Only" (Table VI-F-2) of the SPS scenario in the year 2024. This year represents the maximum activity year during the 30 year scenario. Vehicle flights, fleet sizes, personnel involved, and costs are at a peak with construction of seven SPS units and hypothetical repair of 105 SPS units occurring during the year.
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