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pressure of 7 MPa and a power of 869 MWe. The supercritical CO2 turbine operating conditions are 550oC, 20 MPa and 738 MWe. Unfortunately, all the parameters for the supercritical CO2 turbine are out of range of the formulas described above, but Schlenker’s study shows regularity over a wide range thus it is reasonable to expect that the extrapolation would yield good results. The temperature scaling is independent of power and turbine inlet pressure. The scaling for power and pressure are not independent. The paper does not provide guidance as to which parameter should be scaled first. Therefore, the more conservative value of the two was taken. For the helium turbine from GCRA the proportional constant for temperature is 3.631, the proportional constant for pressure is 0.280 and the proportional constant for power is 73.459. For the CO2 turbine the proportional constant for temperature is 3.359, for the pressure it is 0.042 and for the power 37.392. Thus the cost ratio for temperature is 0.925, for pressure it is 0.730 and for power it is 0.915. The overall turbine cost ratio is 0.618. Before these cost ratios will be applied to the turboset cost it is necessary to take into account the fact that the GCRA design used frequency converters to synchronize with the grid. The frequency converter is not used in the supercritical CO2 cycle, therefore its cost should be subtracted from the cost of the turbomachinery. In his thesis Staudt reviewed the possible use of frequency converters for a helium Brayton cycle [Staudt, 1987]. The cost of the frequency converters he referenced was 20 million in 1992 dollars for a 200 MWe unit. These are used for isolation of weak sections of power grids, therefore their cost is likely to be high. The GCRA helium Brayton cycle needs four of these machines, which results in 80,000 K$ for only the frequency converters leaving only about 40,000 $K for the four turbosets. It can be expected that the cost of the frequency converters used in the GCRA study was much lower, but unfortunately it is not referenced. Therefore, the assumption is made that the frequency converters used in the GCRA helium Brayton cycle cost 40,000 K$. The helium turbomachinery cost is then 78,000K$. Applying the cost ratio developed above the supercritical CO2 turbomachinery cost is 48,204 K$. The account 231.1 for turbomachinery is thus changed from 118,009 $K to 48,204 K$. 191PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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