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really only economically competitive in base load operation, this is not a disqualifying blemish. It may also be solvable if adjustable vanes are incorporated into the turbomachinery. 13.2 Conclusions A systematic, detailed major component and system design evaluation and multiple- parameter optimization under practical constraints has been performed of the family of supercritical COB2B Brayton power cycles for application to advanced nuclear reactors. The recompression cycle is shown to excel with respect to simplicity, compactness, cost and thermal efficiency. The supercritical COB2B cycle is well suited to any type of nuclear reactor with core outlet temperature above ~ 500 oP PC in either direct or indirect versions. Re-heating is applicable only to indirect cycles. Economic analysis of the benefit of re- heating for the indirect cycle showed that using more than one stage of re-heat is economically unattractive. An indirect helium/COB2B cycle requires core outlet temperatures of at least 650oP PC to maintain 550oP PC turbine inlet temperature and hence a reasonable efficiency. The PbBi/COB2B indirect cycle performs significantly better since the lead alloy primary system pumping power is very small and the heat transfer capabilities of lead alloy are much better than that of helium. Therefore, the supercritical COB2B cycle is very well suited for the direct cycle, liquid metal or molten salt indirect cycle and to some extent also for the indirect gas cycle. Three direct cycle designs were selected for further investigation: the basic design with turbine inlet temperature of 550oP PC, an advanced design with turbine inlet temperature of 650oP PC and a high-performance design with turbine inlet temperature of 700oP PC, all with the compressor outlet pressure set at 20 MPa. The basic design achieves 45.3 % thermal efficiency and reduces the cost of the power plant by ~ 18% compared to a conventional Rankine steam cycle. The capital cost of the basic design compared to a helium Brayton cycle is about the same, but the supercritical COB2B cycle operates at significantly lower temperature. The thermal efficiency of the advanced design is close to 50% and the reactor system with the direct supercritical COB2B cycle is ~ 24% less expensive than the steam indirect cycle and 7% less expensive than a helium direct 295PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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