53 The above WBS elements were used to derive cost estimates for all maintenance hardware, including launch and orbital assembly. Estimating costs for Maintenance Hardware: Maintenance hardware includes the cost of maintenance modules, including replacements for modules and servicers. Assuming modules have a 10-year lifetime, thus requiring two refurbishment cycles in a 30-year period, and referencing Mankins and Sasaki for the number of maintenance modules, we arrive at the total number of maintenance modules. We extend our prior application of the SBSP module and servicer spacecraft learning curves to determine the cost of two refurbishment cycles for all modules and servicers, respectively. Note that for all learning rates, Aerospace uses a model based on cumulative averages. We use the Crawford Model, which assumes slower rates of learning and results in higher total costs. Estimating costs for Launch of Maintenance Hardware: Launch of maintenance hardware includes cost, using Starship, for all maintenance launches. Maintenance launches include launch of maintenance servicers and modules. Based on the upmass for the total number of maintenance modules, we find the total number of Starship launches needed to launch to LEO. We assume 12 refueling launches to transfer to GEO are needed for each launch and apply a 15% block buy discount rate (as in the Assemble phase). Estimating costs for Orbital Assembly of Maintenance Hardware: We use the same methodology as we did for the initial assembly of the SBSP system, assuming of $1.2M/month for operations, and the same number of servicers, launches, and time to assemble for each refurbishment cycle. ConOps Phase 5: Dispose Dispose Components: • Manufacture active debris removal spacecraft • Launch active debris removal spacecraft to LEO • Refuel launchers for orbital transfer to GEO • Transfer all SBSP modules from GEO to graveyard orbit with active debris removal spacecraft • Perform mission operations and data analysis to dispose WBS Elements RD1 RD2 Sources Maintain Program Management, Systems Engineering, and Mission Assurance Cost ($) $5.3B $5.27B Cost of Maintenance Launches ($) $130.4B $222.1B Cost of Maintenance Operations ($) $213.6M $364.8M Total Cost Maintain ($) $157.15B $248.85B
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