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comparison are taken from the report published by the Gas Cooled Reactor Associates (GCRA) [GCRA, 1993]. This report presents a comparison of a helium cooled high temperature reactor with a steam cycle, helium Brayton direct cycle and helium Brayton indirect cycle. From this comparison it is possible to obtain consistently generated costs of these three power cycles. The supercritical COB2B cycle is more efficient than the steam cycle and its operating and maintenance costs are not expected to exceed those of the steam cycle. Therefore, if the capital cost of the supercritical COB2B cycle is lower than that of the steam cycle the electricity generation cost will be lower as well. 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 Steam Cycle (GCRA) Helium Direct Cycle (GCRA) Helium Indirect Cycle (GCRA) Supercrticial CO2 Direct Cycle Basic Conservative Turbomachinery Efficiency (550oC) Supercritical CO2 Direct Cycle Advanced Conservative Turbomachinery Efficiency (650oC) Supercritical CO2 Direct Cycle High Performance Conservative Turbomachinery Efficiency (700oC) Supercrticial CO2 Direct Cycle Basic Best Estimate Turbomachinery Efficiency (550oC) Supercritical CO2 Direct Cycle Advanced Best Estimate Turbomachinery Efficiency (650oC) Supercritical CO2 Direct Cycle High Performance Best Estimate Turbomachinery Efficiency (700oC) 35 38 41 44 47 50 Net Efficiency Figure 13.18 Net efficiency and relative costs for different power cycles ($/kWBeB) Figure 13.18 summarizes the results of the economic analysis. It plots the net efficiency of the compared cycles and the $/kWBeB cost of HTGRs with different power cycles normalized to the $/kWBeB capital cost of the HTGR reactor with steam cycle. It indicates that the direct supercritical COB2B cycle can reduce the cost of the power plant by about 16% for the basic design. For the best case of the high performance supercritical 291 $/kWe Cost Relative to HTGR with Steam CyclePDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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