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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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the recompression cycle and the Brayton cycle with three compression stages and two inter-coolers (sometimes with re-heat). Figure 2.16 depicts the temperature entropy diagrams of the CO2 cycles that were investigated in the most depth. The reason why the compressor outlet temperatures are different in the case of cycles with three compressors and two inter-coolers is the effort to minimize the temperature at which heat is rejected from the cycle. For this particular design the specific heat is the largest in the first inter- cooler and smallest in the pre-cooler. In order to equalize the mean temperature of heat rejection the inter-cooler and pre-cooler temperatures have to differ given that the outlet temperatures are the same. Figure 2.16 Temperature entropy diagrams of the investigated cycle layouts [from Dievoet, 1968] In 1968 J. P. Van Dievoet proposed a coupled sodium – CO2 fast breeder reactor concept [Dievoet, 1968]. He pointed out the simplification of the typical three loop (primary, intermediate, power cycle) sodium plant to the two loop only plant, because of the satisfactory chemical compatibility of CO2 with sodium. Although the sodium CO2 chemical reaction is exothermic it does not produce hydrogen. The reaction products, sodium carbonate and free carbon are not readily corrosive. In addition the relatively 28

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