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8.7 Summary An economic assessment of the capital cost of the direct supercritical CO2 recompression cycle was performed. The costs are based on the GCRA report [GCRA, 1993], which presented the costs of a thermal spectrum HTGR with a steam cycle and HTGR with the direct helium Brayton cycle. Advantage of the similarity between the helium Brayton cycle and the supercritical CO2 was taken and the costs of the most of the support systems for the supercritical CO2 plant were taken from the helium plant. The costs of the major supercritical CO2 cycle components were calculated. The recuperators are PCHE made of stainless steel; for the pre-cooler both a stainless steel and a titanium case were considered. The reason for using titanium is to prevent possible maintenance problems with the pre-cooler. In the case of the supercritical CO2 cycle the use of an isolation cooling loop is difficult because it increases the compressor inlet temperature, which results in the reduction of the plant net efficiency and thus a $/kWe capital cost increase.. The cost of the turbomachinery was calculated from cost functions that were developed for HTR components. The scaling parameters are temperature, pressure and electric power. A few additional minor cost adjustments were performed on the plant auxiliary and support systems to better reflect the efficiency driven costs. The direct cycle supercritical CO2 recompression cycle significantly reduces the cost compared to a HTGR using the steam cycle. For the high performance design these savings are 27% of the capital cost on a $/kWe basis. The basic design constitutes savings of about 13%. Compared to the helium Brayton cycle the savings are not as significant and the basic design is more expensive on the $/kWe basis even though the total capital cost is about 10% lower than that of the helium cycle. This is caused by the higher efficiency in the case of the helium Brayton cycle. 200PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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