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the supercritical CO2 PCU is 54 % of the GT-MHR PCU. Thus the power density of the supercritical CO2 PCU is ~ 46 % larger than that of the GT-MHR. This is in spite of the fact that the recuperators of the supercritical CO2 unit transfer double the power of the helium cycle (per kWe). 10.4 Summary This chapter summarized the selected cycle designs. The net efficiency of the basic design was estimated at 41% using the conservative turbomachinery efficiencies and 43% for the best-estimate turbomachinery efficiencies. If 650oC turbine inlet temperature is used (advanced design) the net efficiency reaches 47%. For the 700oC high-performance design, another 2% are gained and the net efficiency is as high as 49%. While the advanced design is supported by the current operating experience the high performance design needs further material research and development. Also, it is noted that the net efficiency might be lowered by the higher required component cooling for the designs with higher turbine inlet temperatures than the 550°C representative of the basic design. Nevertheless, the cycle has the potential to achieve net efficiencies comparable to that of the helium Brayton cycle at 900oC. The major component dimensions were reported and their layout as well as the overall power cycle footprint was presented. The current supercritical CO2 PCU is 18 m (of which 6 m is the generator) tall and 7.6 m in diameter. Its power density is ~ 46% larger than that of the helium Brayton cycle GT-MHR. This demonstrates the cycle compactness. 238PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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