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cycle control systems are assumed to be operational and function as intended. To avoid thermal shock to the reactor structures resulting by the fast power reduction which reduces the core outlet temperature, the primary and intermediate electromagnetic sodium pumps are tripped such that the pumps coast down due to their inertia followed by a transition to natural circulation sodium flow. The primary coolant flow rate versus time is calculated using SAS4A/SASSYS-1 ABTR model and is shown in Figure 4. 1.E+00 1.E-01 1.E-02 PRIMARY FLOW COAST DOWN 1.E-03 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 TIME,s Figure 4. Primary Coolant Flowrate as Calculated by SAS4A/SASSYS-1. Analytical Tool and Assumptions The current version of the SAS4A/SASSYS-1 code does not model the S-CO2 Brayton cycle. Therefore, a Plant Dynamics Code [2] developed for SSTAR LFR is used in the analysis. This code, however, does not currently have a capability to simulate the SFRs with intermediate sodium loops. Therefore, the following assumptions have been made in order to approximately simulate the ABTR S-CO2 cycle response. It is assumed that the heat addition to the S-CO2 cycle in ABTR intermediate Na-to-CO2 heat exchangers is simulated by the SSTAR primary Pb-to-CO2 heat exchangers. The Pb flow rate is artificially corrected to represent the flow rate shown in Figure 4 as described below. The 250 MWt ABTR S-CO2 Brayton cycle is assumed to be represented by the 45 MWt SSTAR S-CO2 Brayton cycle. This includes the dimensions of the cycle 24 RELATIVE FLOW RATEPDF Image | Supercritical Carbon Dioxide Cycle Control Analysis
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