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Figures 13 through 16 show the 400 MWth parametric analyses for the core centerline fuel temperature, cladding temperature, average core pressure drop, and pumping power fraction. Again, a smaller cf results in lower fuel and cladding temperatures as seen in Figures 13 and 14. However, a smaller cf results in a larger pressure drop and pumping power as seen in Figures 15 and 16. Likewise, a smaller diameter fuel pin results in lower fuel and cladding temperatures but a larger pressure drop and pumping power. The same two points were selected as a possible range of desirable conditions: a 0.2 cf with a 0.75 cm diameter pin, and a 0.3 cf with a 1.2 cm diameter pin. The 0.2 cf case has a maximum fuel temperature of 1190°C, cladding temperature of 610°C, and pumping power fraction of 0.028 (2.8%). The 0.3 cf case has a maximum fuel temperature of 2220°C, cladding temperature of 725°C, and pumping power fraction of 0.004 (0.4%). These cases are more interesting to evaluate. The 0.2 cf is unacceptable because the pumping power fraction exceeds the desired value of 0.01 (1%) by a factor of 2.8. However, the 0.3 cf case exceeds the maximum fuel and cladding temperatures. A compromise condition of 0.25 cf and a pin diameter of 1.1 cm would allow for a 400 MWth core, for which the pumping power and fuel and clad temperatures remain below the acceptable limits. In conclusion, the thermal hydraulic scoping analysis shows that an acceptable fuel pin and coolant fraction can be found for the reactor operating at both 200 MWth and 400 MWth with a core radius of 0.85 m, core height of 1.6 m, pin plenum height of 1.0 m, CO2 pressure of 20 MPa, core inlet temperature of 450°C, core outlet temperature of 650°C, and core radial and axial peaking factors of 1.4. 31PDF Image | Supercritical CO2 Direct Cycle Gas Fast Reactor (SC-GFR)
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