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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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(2009) is the availability of a flow meter within the loop and the heating and cooling capabilities of the loop (20-50 kWth). A schematic of the SNL S-CO2 compression loop is illustrated in Figure 26, and an engineering drawing is shown in Figure 27. A photo of the actual loop is provided in Figure 28. The loop has two heat exchangers. In Figures 27 and 28, one is located in the lower portion of the loop (large light blue tank) and the other in the upper portion (top-hat-shaped heat exchanger). The intended modifications include elevating the upper “top hat” shaped heat exchanger by about 3 m by inserting extension sections of 1 1⁄2” schedule 160 piping. The only other modification required is to re-plumb the water circuits so that the heated section uses the lower heat exchanger and the cooling section the upper heat exchanger. The tests will measure the actual flow rate (using a highly accurate Coriolis flow meter), fluid densities, and temperatures as a function of time for various initial fill densities, pressures, heat load, and degree of subcooling in the heat rejection system. The tests results can then be used to validate the natural circulation codes and tools. Currently, the simple lumped-parameter model predicts that 20 kW of heating will produce a flow rate of about 0.2 kg/s and a hot-to-cold leg T of 63K, with a loop P of 4 kPa. Gas Chiller 50 kW 3 Valve h 2 1 Heat Exchanger + 50 kW 4 Compressor Motor Alternator Water Heater Flow Meter Water Pump Figure 26. Schematic of the SNL S-CO2 Compression Loop Modified for Natural Circulation Flow Tests. 47

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