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300 MWe Supercritical CO2 Plant Layout and Design

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300 MWe Supercritical CO2 Plant Layout and Design ( 300-mwe-supercritical-co2-plant-layout-and-design )

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prospect for reducing mills/kWhre because the PCU costs less than a Rankine steam plant. Table 2.3 Net Efficiency Evaluation of LBE Cooled Indirect Cycle Reactors (Ref 2.3) Steam cycle 700 42.7 298.9 7 278.0 39.7 Helium cycle 700 32.0 224.0 5 212.8 30.4 With respect to the last observation it should be noted that the LPC versions can accommodate breeder reactor cores, which utilize uranium a factor of fifty or more more efficiently than an LWR, and which are considered by many to be better minor actinide incinerators. Thus they have a better future prospect for sustainability – an important GEN-IV program goal. A second point is that the LPC results do not yet fully reflect all potential cost savings, in particular a. A smaller containment structure can be employed because the primary coolant is not volatile, and the secondary plant can be located outside containment. b. The LPC/S-CO2 plants operate at maximum temperatures about 350°C cooler than helium cooled HTGRs, which reduces materials costs and the need for component cooling. c. It is likely that the S-CO2 turbine inlet temperature can be increased from the rather conservative value of 550°C. A final observation is that essentially the same power conversion unit (PCU) can be used in both indirect and direct cycle applications. The latter version is competitive with the ALWR. This also suggests that the near term focus be on PCU cost quantification and reduction. 2.5 Component Cost Comparisons Cost evaluations have been pursued at two levels: component-wise and on a complete power station basis (i.e. mills/kWre busbar costs). Both are based on relative comparisons versus better known alternatives. This section summarizes some of the Thermal power (MWth) Cycle efficiency (%) Gross electric power (MWe) Self- consumption (%) Net electric power (MWe) Net efficiency (%) Supercritical CO2 cycle 700 43.8 306.6 4.5 292.8 41.8 15

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