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6068.48 $K for the BOP. Since multiple cases are used the same methodology was applied to them and the results are summarized in Table 8.7 Account 26 – Heat rejection system – is affected by the isolation cooling loop and the change of efficiency. The isolation cooling loop affects account 262 in the same manner as in the case of the helium cycle. The additional capital cost of the isolation cooling loop has a miniscule effect on the total plant cost and has a beneficial safety feature in isolating the water that goes to the pre-cooler. Thus, the pre-cooler corrosion can be better monitored and controlled. In such a case a stainless steel pre-cooler can be used. On the other hand if introduction of the isolation cooling would result in an increase of the compressor inlet temperature and thus reduction of the plant net efficiency the isolation cooling loop would have to be reconsidered especially in the case of the supercritical CO2 cycle, which is sensitive to this temperature. If the isolation cooling water loop would increase compressor inlet temperature by 5oC (a very small temperature difference for the isolation cooling loop heat exchanger) the net efficiency would be reduced to about 39% net efficiency for the basic design, which results in a $/kWe cost increase of about 5%. This clearly demonstrates that an isolation cooling loop can be used only if the compressor inlet temperature is not affected. Table 8.8 Account 263 adjustments Turbomachinery* Temperature Net Efficiency Power CO2 Cycle 23,666.57 19,420.45 17,710.97 21,571.08 17,600.68 15,836.06 Conservative Conservative Conservative Best Estimate Best Estimate Best Estimate (oC) 550 oC 650 oC 700 oC 550 oC 650 oC 700 oC (%) (MWe) 41.0 738 45.3 % 815 47.0 % 846 43.1 % 776 47.1 % 848 48.9 % 880 * see Chapter 10 for conservative and best estimate turbomachinery efficiencies Steam cycle = 26148.07 $K, Steam cycle power = 693 MWe, Helium cycle = 16442.65 $K, Helium cycle power = 869 MWe Account 263 contains the requirements on the cooling water and is a function of the cycle efficiency. The supercritical CO2 cycle has lower efficiency than the helium cycle, but higher than the steam cycle. Therefore, the cost reduction compared to the steam cycle was again obtained as a linear interpolation. In the case of the steam cycle the efficiency is 38.5% and account 263 has a value of 26148.07 K$. In the case of the 194PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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