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advanced reactor technology, is used in this work. This methodology subdivides the costs into accounts. Accounts that start with the number 2 are direct cost accounts, while accounts that start with number 9 are indirect cost accounts. The advantage of this methodology is that one can readily compare the cost of different plant systems. Unfortunately, this methodology was developed for reactors with an indirect steam cycle. This makes the application of the methodology difficult since for the case of a gas cooled reactor with a direct cycle many of the account numbers do not apply and one has to decide under which account a component will fall. The authors of the GCRA report also had to solve this problem, so their approach will be used for account designation and content. Note that the comparisons are performed for thermal spectrum HTGRs and not fast spectrum GFR units, without taking into account any potential cost differences or special issues such as the reaction of CO2 with graphite. 8.3 Comparison of Steam and Helium Brayton Cycles from GCRA The reference plant in the GCRA report consists of four blocks each 450 MWth. Each reactor supplies its own power cycle. The reference power cycle is a steam cycle. Two alternatives: indirect and direct helium Brayton cycles were investigated as well. The direct helium Brayton cycle net electric power is 869 MWe. The indirect helium Brayton cycle net electric power is 806 MWe. The GCRA report cost estimates for a steam cycle are presented in Table 8.1 and the cost estimates for the helium direct cycle are presented in Table 8.2. All the costs are presented in January 1992 dollars. In order to identify better the differences between these two plants Table 8.3 shows the cost differences between these two plants obtained by subtracting the helium direct cycle plant account costs from the steam cycle costs. If the difference is negative it represents a saving, if it is positive it represents additional expense. The full tables with the detailed account breakdown are presented in Appendix A. From the result it can be immediately seen that the total plant capital cost increased for the direct helium Brayton cycle, but the improved efficiency and thus higher electric power rating reduced the unit capital cost in $/kWe. To apply these results to the supercritical CO2 cycle one has to first understand the cost differences. 183PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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