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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(account 212) due to the increase in silo diameter to accommodate the larger power conversion vessel. However due to the reduction of the silo depth the reactor building structural and excavation costs are reduced. In account 22 – Reactor Plant Equipment - the cost increase of 9% was mainly due to the cost increase of the Heat Transport System (account 223). This increase represents a net effect of elimination of the steam generator and main circulator and the addition of the three power conversion loop heat exchangers. Accounts 221 and 222 were mainly affected by the change of materials required due to higher operating temperature. Account 222 is in addition affected by the increase in size of the power conversion unit. Accounts 224 and 225 (shutdown cooling accounts) are affected due to the increase in normal operating temperature. Account 227 – Reactor Service System - presents a cost increase due to the additional remote maintenance requirements of the turbomachinery. The cost of Reactor Control Protection and Monitoring (account 228) increases for the same reason, i.e. the more demanding control and protective requirements of the turbomachinery. Account 23 – Turbine Plant Equipment - presents one of the largest savings of the helium direct cycle compared to the steam cycle. This reflects the elimination of most steam turbine plant functions. The exception is the Turbine Generator (account 231) which is more expensive than in the case of steam cycles. It should be pointed out that this also contains the costs of the compressors. This increase is mainly due to the addition of the frequency converter, which is necessary because the helium turbomachinery must operate at higher rotational speed than the synchronous speed to achieve high efficiency. Account 24 – Electric Plant Equipment - is increased by about 7% mainly due to the increased electrical output compared to the steam cycle. Account 25 – Miscellaneous Plant Equipment - is reduced by 24%. This reflects the elimination of systems that are not required for the helium cycle. Elimination of requirements for steam, water and air systems account for most of the cost reduction. 187

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