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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( advanced-nuclear-power-technology-program-supercritical-carb )

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high pressure and very high temperature. The study does not explain why such extreme conditions were used. One has to infer that efficiency rather than cost of electricity was the target. Thus, to achieve net efficiencies on the order of 40%, high temperature was necessary. The high pressure is questionable since above 20 MPa the efficiency of the supercritical CO2 cycle is not significantly improved [Dostal et. al, 2002]. In the case of a nuclear power plant the situation is quite different, as the net efficiency is not compromised by the stack heat losses and thus an efficiency around 45% is achievable at a turbine inlet temperature of 550oC and a compressor outlet pressure of 20 MPa. This significantly reduces the capital cost of the supercritical CO2 cycle and it is one of the main objectives of this work to demonstrate that this cycle is significantly less expensive than the steam cycle. Figure 2.19 Summary of results of the ECAS evaluation [from Corman, 1976] 33

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