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Supercritical CO2 Direct Cycle Gas Fast Reactor (SC-GFR)

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Supercritical CO2 Direct Cycle Gas Fast Reactor (SC-GFR) ( supercritical-co2-direct-cycle-gas-fast-reactor-sc-gfr )

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Contents Executive Summary ........................................................................................................................ 7 1 2 3 4 5 6 7 Introduction ............................................................................................................................. 9 Review of Gas Cooled Reactor Concepts ............................................................................. 11 2.1 Comparison of the GFR Concepts ................................................................................ 12 2.2 Issues Generally Associated With GFR Concepts ........................................................ 14 Supercritical CO2 Cycle ........................................................................................................ 15 Reactor Core Conceptual Design and Plant Layout .............................................................. 19 4.1 Reactor Fuel and Core Description.............................................................................. 19 4.2 Facility and Plant Layout ............................................................................................. 24 Heat Transfer and Thermal Hydraulic Analyses ................................................................... 28 Neutronic Analysis ................................................................................................................ 34 6.1 Burnup Analyses ........................................................................................................... 34 6.2 Delayed Neutron Fraction and Void Worth.................................................................. 38 Natural Circulation Flow and Decay Heat Removal............................................................. 40 7.1 Lumped-Parameter Natural Circulation Analyses ....................................................... 42 7.2 Three-Dimensional CD3-SC Natural Circulation Analyses......................................... 45 7.3 Natural Circulation Test Plans With the SNL S-CO2 Research Loop .......................... 46 8 9 10 References ............................................................................................................................. 52 Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Tables Summary of Major GFR Design Features for a Variety of Different Concepts............ 13 Power Plant Parameters for the Baseline S-CO2 Concept. ............................................ 22 Reactor Fuel Parameters. ............................................................................................... 22 Reactor Core Parameters. .............................................................................................. 23 Delayed Neutron Fraction and Void Worth Calculated Using MCNP.......................... 39 Comparison of the Grashof Number for S-CO2 and Water. .......................................... 41 Figures Future Research ..................................................................................................................... 49 Conclusions ........................................................................................................................... 51 Figure 1. Cycle Thermal Efficiency as a Function of Heat Source Temperature.........................16 Figure 2. Flow Schematic and T-S Diagram for the Split-Flow S-CO2 Cycle. ............................17 Figure 3. MCNP Model of the Reactor Core................................................................................20 Figure 4. Conceptual Illustration of the Reactor Pressure Vessel and Core.................................20 Figure 5. Conceptual Plant Layout for a S-CO2 Power Conversion System With a Combined Turbine/Compressor/Generator Unit. .......................................................25 Figure 6. Conceptual Plant Layout for a S-CO2 Power Conversion System With a Separate Turbine/Generator Unit and Combined Turbine/Compressor Unit. ..........................25 5

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