the deployment cycle of many systems. The data are plotted versus the transportation-assembly cost. We see that the major impact on energy cost is the power source and transportation assembly with the MPTS portion having an impact perhaps less than the variations in the annual rate of return or build cycle. Since projections of future costs for the competing nuclear fueled terrestrial systems range up to 35 mills per kW hour, it is important to set the goals for the transportation-assembly at no more than 200 $/kg, and the power source no more than 350 $/kW with 1 kg/kW specific weight. These combinations, together with a nominal 60 percent MPTS efficiency, would be near the 45 mills per kW hour level for a three year ground fabrication and orbital operations (build) cycle, 80 percent utilization in recognition of less demand than the full availability of 95 percent would allow, and 15 percent rate of return. 12.3 FINAL SYSTEM ESTIMATES 12. 3. 1 COST AND WEIGHT A review of all subsystem estimates was made in preparation of this report and some revisions resulted in subsystem estimates relative to the values used in the parametric studies. The data are presented in Figure 12-31 keyed to Work Breakdown Structure items. Changes were as follows: Rectenna Power Interface (Item 1. 5) The original estimate of 12 $/kW was increased to the equivalent of 45 $/kW for a 5 GW system to reflect the later value derived in Section 9. Transmitting Antenna Subarray Electronics (Items 4. 1, 4.2, 4.3) The specific costs of these items were normalized to a uniform 1000 $/kg to reflect experience with equipment of this complexity for the space environment. A learning curve of 85 percent was used. This represents a cost increase since a portion has been costed at a lower value. Transmitting Antenna Subarray Waveguide (Item 4.4) The waveguide costs were revised downward to reflect mass production and a more appropriate cost scaling technique. Raytheon cost experience in 2 large phased array ground radars was used on a $/m basis together with an 85 percent learning curve for the aluminum case. A 31 $/kg value resulted. The latter had been adopted in common with the structure estimated by Grumman (see Section 8).
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