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components (turbomachinery and heat exchangers), CO2 flow rates and temperatures, as well as the turbomachinery response (performance maps). The flow rates, HX heat ratings and turbomachinery power ratings are scaled to the steady state nominal design values to account for the difference between the ABTR and SSTAR power inputs. The differences in S-CO2 temperatures and turbomachinery response are neglected in this analysis. It is envisioned that it would take few minutes to accomplish a smooth transition from the normal S-CO2 cycle operation to the operation under the shutdown heat removal mode. Therefore, it is sufficient to show that the S-CO2 cycle could effectively remove the decay heat from the reactor during first few minutes of the transient. Figure 5 shows the history of the primary flow coast down presented in Figure 4 during first few 2000 seconds (~33 minutes) of the transient. It can be seen in Figure 5 that the transition from the forced flow cost down caused by the primary pumps inertia to the natural circulation flow occurs between 400 and 800 seconds into the transient. Therefore, 400 seconds (~7 minutes) is considered to be a sufficient time for the shutdown heat removal loop to start. Therefore, the initial portion of the transient, 400 seconds characterized by the primary pump coastdown time, is selected for the S-CO2 cycle transient analysis using the ANL Plant Dynamics Code. 1.E+00 1.E-01 1.E-02 PRIMARY FLOW COAST DOWN 1.E-03 0 200 400 600 800 1000 1200 1400 1600 1800 2000 TIME,s Figure 5. ABTR Primary Flowrate during First 2000 seconds. 25 RELATIVE FLOW RATEPDF Image | Supercritical Carbon Dioxide Cycle Control Analysis
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