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Multiple cases at different turbine inlet temperatures and turbomachinery efficiency will be used so the cost of the turbomachinery needs to be estimated for them as well. The same methodology was applied and the results are presented in Table 8.6. Table 8.6 Summary of the turbine costs Turbomachinery* Temperature Efficiency Power Temp. Power Pressure Helium Turb. CO2 Turb. Cost (K$) 47,455 50,945 52,614 49,035 52,272 53,952 Conservative Conservative Conservative Best Estimate Best Estimate Best Estimate (oC) 550 650 oC 700 oC 550 oC 650 oC 700 oC (%) (MWe) Ratio 41.0 738 0.925 45.3 % 815 0.932 47.0 % 846 0.940 43.1 % 776 0.925 47.1 % 848 0.932 48.9 % 880 0.940 Ratio Ratio 0.901 0.730 0.960 0.730 0.983 0.730 0.931 0.730 0.985 0.730 1.008 0.730 Cost (K$) 78,000 78,000 78,000 78,000 78,000 78,000 * see Chapter 10 for conservative and best estimate turbomachinery efficiencies 8.6 Direct Cycle Cost Given the costs of all the major components the cost savings that can be achieved by the use of the supercritical CO2 cycle can be estimated. The following section describes the adjustment done to other accounts than those containing the major cycle components. 8.6.1 Discussion of Changes for the Supercritical CO2 Cycle Since cost changes between the steam cycle and helium cycle in the GCRA report were performed on both the Nuclear Island (NI) and Balance of Plant (BOP) it is difficult to decouple the costs of the BOP and NI in an easy manner. Accounting for BOP costs only does not give the full cost of the power cycle option. First of all it is important to point out that for the supercritical CO2 cycle the operating temperature remains practically unchanged from that of the GCRA steam cycle, therefore any cost increases that were made due to the temperature increase for the helium Brayton cycle are not necessary here. Based on this assumption the 224/225 shutdown accounts cost increase is not necessary since the operating temperature is unchanged. Therefore, for these accounts the costs from the steam plant will be used. 192PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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