Abstract
The SCO2-Cooled Reactor System (SCRS) has good prospects in Gen-IV reactors. The SCO2 makes SCRS safe, compact and efficient. However, the variations of SCO2 thermophysical properties cause complex operation characteristics of SCRS. Transient simulation has great significance for SCRS safety analysis and its control system design. In this paper, the RELAP5 was modified and benchmarked by typical design. Transient conditions including reactor power step reduction, loss of electrical load and cooling water temperature disturbance were simulated without the intervention of control or auxiliary systems to study the natural responses of SCRS. The results demonstrated that the first two transients had great influence on turbomachinery. And control and auxiliary systems were necessary to respond quickly to ensure the normal operation of turbine. Moreover, the influences of cooling water temperature disturbance with temperature increase of 1 K on the change of main compressor operation condition and the weakening of circulation efficiency were acceptable.
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