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loop will be assessed. To simplify the calculation procedure the power transmitted in the intermediate heat exchanger remains constant at 600 MWth and the reactor power will be lowered by the pumping power supplied in the pump or circulator (both with efficiency of 85%). The volume and cost of the intermediate heat exchanger can be calculated as well as the overall efficiency of the indirect cycle, since the primary circuit pumping power requirements are known. Based on the obtained results the optimum reactor operating temperatures will be identified. The same approach will be repeated for assessment of re-heating. This will also identify how many stages of re-heat are economically feasible, since the benefit of re- heating decreases with additional re-heating stages. 7.3 Primary Loop Description 7.3.1 Helium Primary System The detailed modeling of the helium primary system is needed because the inlet and outlet core temperatures significantly affect the mass flow rate of the helium, pressure drop around the primary loop and thus the required blower power, which is a significant fraction of the plant house load. The geometry is based on a fast gas cooled reactor and is depicted in Figure 7.1. The dimensions and loss coefficients are summarized in Table 7.1. Helium is at 8 MPa operating pressure. Table 7.1 Primary loop parameters Component name Inlet duct Downcomer Inlet plenum Distribution Plate Bottom reflector Core Top reflector Outlet plenum Flow Area (m2) 3.0 3.8 1.0 N/A 1.0 2.0 1.0 9.0 12.57 Length (m) Hydraulic diameter (m) 1.3650 0.3500 4.0000 4.0000 0.0165 0.0165 0.0165 4.0000 0.8000 Loss Coefficient 1.00 0.00 0.35 5.00 0.50 0.10 0.50 0.00 0.30 3.90 5.50 12.57 12.57 1.47 1.47 1.47 Outlet duct 3.0 0.50 159PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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