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2. Reference Conditions For the analyses presented in further sections, the S-CO2 cycle conditions for the Advanced Burner Test Reactor (ABTR) have been selected [8]. The ABTR is designed for 250 MWt core power, which translates to about 100 MWe generator output. The sodium core inlet and outlet temperatures are 355 oC and 510 oC, respectively. There is a 22 oC temperature drop from the primary to the intermediate Na loop, so the intermediate sodium temperature at Na-to-CO2 heat exchanger inlet is 488 oC. The S-CO2 temperature at the turbine inlet is about 470 oC. The resulting cycle efficiency is 39 %. At the bottom of the cycle, the CO2 is cooled such that when the flow accelerates at the compressor inlet nozzle, the static temperature and pressure are 31.25 oC and 7.40 MPa, which are very close to but still above the CO2 critical point (30.98 oC and 7.373 MPa). Table 1 shows the detailed design and nominal operating conditions for the S-CO2 Brayton cycle components for the reference cycle. The cycle and each component optimization process are described in detail in Reference [8]. For this work, it is assumed that the conditions on sodium side (flow rate and temperatures) are fixed. Therefore, the S-CO2 cycle itself is optimized be optimized for the fixed sodium side conditions. It is noted however that there remains an opportunity to improve both the cycle and entire plant performance by optimizing the sodium side conditions, as through variation of the intermediate sodium flow rate and the intermediate heat exchanger (IHX) inlet temperature. This additional joint optimization of both the power conversion cycle and the reactor heat transport system is beyond the scope of the current investigation. 9PDF Image | Performance Improvement Options for the Supercritical Carbon Dioxide Brayton Cycle
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