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necessary. In this case the reactor core and the intermediate heat exchangers and re- heaters constitute the major system pressure drops and the rest of the loop can be neglected. The pumping power of the reference design of a lead alloy cooled fast reactor (LFR) developed at MIT [Dostal et al., 2001] was used. Since the power of the indirect cycle is 600 MWth and the power of the LFR is 700 MWth the value of pumping power from the LFR design was scaled down by the factor of 6/7. The value of mass flow rate corresponding to the LFR operating temperatures was taken as the reference mass flow rate. During the evaluation of the indirect lead bismuth alloy/supercritical CO2 cycle the value of the pumping power across the core was scaled with the square of the mass flow rate: ⎛ m& ⎞2 P = Pref ⎜ m& ⎟ (7-1) ⎝ ref ⎠ where P is the new pumping power, Pref is the reference pumping power, m& is the new mass flow rate of lead bismuth and m& ref is the reference mass flow rate. The pumping power across the intermediate heat exchangers and re-heaters was then calculated and added to core pumping power to obtain total pumping power of the primary system for lead alloy circulation. 7.4 Helium Indirect Cycle This section covers the results obtained for the helium supercritical CO2 indirect cycle. The investigated cycle layout is a recompression cycle with none, one and two stages of re-heat. Primary system helium is at 8 MPa operating pressure. 7.4.1 Indirect Helium / Supercritical CO2 Recompression Cycle Using the methodology described above the performance of the indirect helium to supercritical CO2 cycle was calculated. The most important question is the magnitude of the cycle efficiency penalty due to additional blower pumping power compared to the direct cycle. For the comparison a reference direct supercritical CO2 cycle with a cost of 161PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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