Of the three types of systems being considered, the only one which requires further discussion in this context is solar terrestrial. The restatement of SSPS costs using the TRW methodology has already been covered and shows a range 35-45 mills/kWh at a nominal 0.70 load factor and 27-35 mills/kWh at a 0.90 load factor. No formal comparison of the LMFBR costs synthesized from available base data is possible since the TRW assumptions on fuel cycle costs and their uncertainties are not stated explicitly in the available documentation. In the case of solar terrestrial, the restatement of base costs using the TRW methodology is possible since there are no fuel costs to be considered. There is, however, a question as to the appropriateness of a 0.70 load factor for a solar terrestrial system with 6 hours of 70 percent storage. The restated estimates shown below are therefore given both for the TRW "standard" load factor of 0.70 and the JPL projected load factor of 0.54. SOLAR TERRESTRIAL ENERGY COSTS RESTATED USING THE TRW METHODOLOGY (Based on 100 MWe Central Receiver with 70 MWe 6-hr. Storage) Load Factor Base Cost Cost Range (+15% Capital Cost) 0.70 46 mills/kWh 40-52 mills/kWh 0.54 58 mills/kWh 50-62 mills/kWh (3) Cost-Related Factors Not Considered As noted earlier, this analysis is very limited in scope. It is, however, important to identify certain elements which may have significant impact on costs or benefits which, for a variety of reasons, have not been considered in this analysis. With the notable exception of a very brief treatment in the ECON study (Ref. All) and a somewhat expanded treatment in the Berkeley evaluation of conventional power systems (Ref. A25), much of the literature on the LMFBR is expressed in terms of cost-benefit analysis. This involves
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