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7.5 Lead Alloy / CO2 Indirect Cycle The same analysis that was performed for the helium primary system was performed for the lead alloy primary system. In this case the lead alloy was at atmospheric pressure and the pump had to overcome only the loop- pressure drop. The inlet and outlet temperature of the reactor were varied in order to find the minimum of the capital cost in $/kWe. The reference plant is a direct CO2 recompression cycle with turbine inlet temperature of 550oC and thermal efficiency of 45%. 1.05 1.04 1.03 1.02 1.01 1 0.99 400 450 500 550 600 650 700 580 oC 600 oC 620 oC 640 oC 660 oC 680 oC 700 oC 720 oC 740 oC 760 oC Reactor Inlet Temperature (oC) Figure 7.16 Indirect cycle capital cost for different reactor inlet and outlet temperatures for lead alloy primary coolant Figure 7.16 shows that lead alloy performs significantly better as a primary coolant from the cost perspective. The capital cost in $/kWe is almost the same as for the reference direct cycle if the primary system temperatures are optimized. Much lower reactor outlet temperature is required compared to the helium primary system. At 600oC (i.e. 50oC higher than for direct cycle) the capital cost increase compared to the reference 174 IC Cost ($/kWe)/Reference DC Cost ($/kWe)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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