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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• Since CO2 can be stored in the liquid phase at relatively low pressures the required storage capacity is smaller than for helium. • CO2 gas turbine cycles achieve higher efficiencies than the helium Brayton cycles at fast breeder reactor temperatures. • Since the entire gas turbine plant is in the secondary loop it can be placed in the open air. • The cooling system can be of the direct type because the primary coolant is not in direct contact with the cooling water. • With CO2 in the secondary circuit higher cycle temperatures could be used in the future • The size of the turbomachinery is smaller than for steam or helium cycles. The disadvantage of CO2 indirect cycles is mainly in the supplemental helium – CO2 heat exchanger leading to a longer concrete vessel and supplementary losses. Nevertheless, Strub and Frieder thought that the indirect cycle was highly desirable from the safety standpoint and the direct gas turbine cycle should be introduced only after careful consideration regarding maintenance and safety. Figure 2.17 Comparison of component sizes for different power cycles [from Strub and Frieder, 1970] 30

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