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The thermal resistance of the insulation is so high that changes in the insulationβs thermal conductivity result in almost perfectly linear responses in heat lost. Thus, if the conductivity of the insulation is underestimated by a factor of three, then the corresponding results in Figures 4.2 and 4.3 are just a multiple of three higher, which is still very little heat lost. In the intermediate loop sodium pump, the temperature rise is also very small. The pumping power for an incompressible fluid is given by πππ’ππ = Ξππ Eqn. 4-3 π The CRBR, whose intermediate pipes served as a model for the calculation above, has an intermediate pump head of 0.86 MPa. The CRBR is a conservative test case because it has one of the highest pumping powers for SFRs, as shown in Table 4.2, and the CRBR matches the ABR-1000 closely in intermediate loop mass flow rate and temperature [IAEA, 2006], as shown in Table 4.3. Table 4.2 Intermediate Loop Pumping Power Requirements for SFRs Reactor CRBR (USA) Super-Phenix 1 (France) ALMR (USA) BN-1600 (Russian Federation) JSFR-1500 (Japan) Intermediate Pump Head (MPa) 0.86 0.25 0.34 0.331 0.335 Table 4.3 Characteristics of CRBR and ABR-1000 Intermediate Loops CRBR Hot Temperature (oC) 502 Cold Temperature (oC) 344 Mass Flow Rate (kg/s) 1629 Intermediate Loop Power (MWth) 325 Number of Loops 3 ABR-1000 488 333 1256 250 4 With the head requirement of 0.86 MPa, the pump work comes out to 1.30 MW for the intermediate pump. The sodium temperature rise through the pump is given by 87PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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