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efficiency of the indirect cycle, since the primary circuit pumping power requirements were known. The heat exchanger geometry was changed to reflect the reduction of allowable stresses at higher temperature. The same approach was repeated for the assessment of re-heating, which identified how many stages of re-heat are economically feasible, since the benefit of re-heating decreases with additional re-heating stages. 1.2 1.16 1.12 1.08 1.04 1 400 450 500 550 600 650 580 oC 600 oC 620 oC 640 oC 660 oC 680 oC 700 oC 720 oC 740 oC 760 oC Reactor Inlet Temperature (oC) Figure 13.11 Helium/COB2B Indirect cycle cost relative to the direct cycle for different reactor inlet and outlet temperatures Figure 13.11 and Figure 13.12 show the result of the indirect cycle analysis. In the case of a PbBi indirect cycle the additional cost of an intermediate heat exchanger and the efficiency reduction is minimal and the plant cost is almost unchanged. In the case of the helium/COB2B indirect cycle the cost increase just from the intermediate heat exchanger cost and efficiency reduction is about 3%. Moreover, higher core outlet temperatures than for a direct cycle have to be utilized to minimize the pumping power requirements. The displayed relative cost is the capital cost in $/kWBeB of the indirect cycle divided by that of the direct supercritical COB2B cycle with 45% thermal efficiency and plant 284 Relative $/kWe Capital CostPDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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