ICONE23-1336 A PRELIMINARY RESEARCH FOR THE OPERATING CHARACTERISTICS OF THE MULTI-MODULE NUCLEAR REACTOR SYSTEM

Abstract

The modular high temperature gas-cooled reactor could realize higher power and lower capital cost by combining multiple modular reactor system with a large capacity steam turbine unit. The HTR-PM plant based on dual-module reactors has been under construction in China. Meanwhile, another multiple module reactor system is also under research, in which, six modules of reactors are combined and connected to a 600MW steam turbine to make one power unit. Due to the shared equipment or systems in the secondary loop, the coupling effects among different modules posed great challenge to the designs and operating analyses for the multi-module reactors. In the present paper, the HTR-PM and six-module reactor systems were described and compared. The different number of modules and the system compositions in the secondary loops were focused and related to the coupling effects during operations. Then, the engineering simulator for six-module reactors was introduced for the operating analyses in the advantages of real-time calculation and coupled calculation in multi-module models. Starting from the full power operation condition, a typical operation process of reducing one reactor module's power from 100% to 50% was simulated for both the HTR-PM and six-module reactor systems. The results indicated that the dynamic change of one reactor had less influence on the others in the six-module reactors than that in HTR-PM.