Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( advanced-nuclear-power-technology-program-supercritical-carb )

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about 30oC (unrealistic with respect to core thermal hydraulic design) is the efficiency more significantly affected. The estimated costs of the intermediate heat exchangers are about one third of the helium / CO2 heat exchangers (on the order 750,000 K$). This is due to the better heat transfer performance of the lead alloy. However, the only liquid metal used to date with PCHE was mercury. In this analysis semicircular channels with 2mm diameter were used, which may not be possible with lead alloys. Feasibility of PCHE use with lead alloy coolants needs to be confirmed and the cost of these heat exchangers may be increased significantly. 1.15 1.1 1.05 1 0.95 580 620 660 700 740 780 2 Re-heats 1 Re-heat No Re-heat Reactor Outlet Temperature (oC) Figure 7.18 Relative cost for lead alloy / CO2 reactor plants for different indirect cycle options 7.5.1 Comparison of Re-heated and Non-reheated Indirect Cycle As in the case of the helium indirect cycle, the effect of re-heating was investigated for the lead alloy indirect system as well. Re-heating has the same effect on the lead alloy system as on the helium system. The cycle efficiency is slightly improved, the optimum reactor inlet and outlet temperatures are slightly increased and the capital cost 176 Relative $/kWe Capital Cost

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