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The cost increase in account 262 reflects the addition of the isolation cooling loop, which was introduced in order to improve cooling water control and thus reduce the maintenance issues of the pre-cooler and inter-cooler. The supercritical CO2 cycle requires the compressor inlet temperature of 32oC. Addition of another cooling water loop might make achievement of this temperature difficult. It was decided to evaluate both cases to see the cost difference before the final decision is made. If the cost increase is negligible and if the compressor inlet temperature of 32oC can be maintained with the isolation cooling loop, then it should be used. This is mainly because the use of the isolation loop makes possible the use of a stainless steel pre-cooler, which is significantly cheaper than the titanium pre-cooler. However, if the compressor inlet temperature cannot be maintained at 32oC the isolation cooling should not be used, since the saving due to the use of a stainless steel pre-cooler would be largely offset by the efficiency reduction. Turbomachinery* Conservative Conservative Conservative Best Estimate Best Estimate Best Estimate Temperature (oC) 550 650 oC 700 oC 550 oC 650 oC 700 oC Efficiency Power (%) (MWe) 41.0 738 45.3 % 815 47.0 % 846 43.1 % 776 47.1 % 848 48.9 % 880 NI CO2 7919.05 9600.69 10277.71 8748.95 10321.39 11020.25 BOP CO2 6149.92 5801.53 5661.27 5977.99 5652.22 5507.43 Table 8.7 Account 246 adjustments * see Chapter 10 for conservative and best estimate turbomachinery efficiencies BOP Steam = 6353.53 $K, NI Steam = 6936.28 $, Steam power = 693 MWe BOP Helium = 5557.20 $K, NI Helium = 10780.02 $K, Helium power = 869 MWe Account 24 was increased in the case of the helium direct cycle due to the larger electric output. Supercritical CO2 power output is different than that of helium and higher than that of the steam cycle. This is mainly reflected in account 246. Therefore, the cost in account 246 in the case of supercritical CO2 was obtained by a linear interpolation between the steam cycle and helium cycle values. The value of account 246 for the steam cycle is 6936.28 $K for the Nuclear Island and 6353.53 $K for the BOP. In the case of the helium cycle these values are 10780.02 $K for the Nuclear Island and 5557.20 $K for the BOP. Steam cycle net electric rating is 693 MWe, helium cycle net electric rating is 869 MWe and supercritical CO2 basic cycle net electric rating is 738 MWe. Account 246 thus has a value of 8312.16 $K for the Nuclear Island and 193PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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