Abstract
Abstract The primary circuit of a natural circulation pool-type lead-cooled fast reactor adopts full natural circulation cooling technology, the reactor core power regulation process has the characteristics of long regulation time. When developing the reactor power control system, it is necessary to fully understand the dynamic characteristics of the reactor, so it is necessary to establish the nonlinear model of the natural circulation lead-cooled fast reactor. Based on the requirements of reactor dynamic characteristics research and power control system development, a nonlinear model of primary circuit is established on MATLAB/Simulink platform. The dynamic characteristics of the reactor are analyzed by introducing the reactivity disturbance of the reactor core and the flow and temperature disturbance of the secondary loop coolant. The transient response trend of the system is reasonable and conforms to the physical law, which can be used to analyze the dynamic characteristics of the system and the design of the control system. The core power control system adopts load following mode, and the load power measured value is used as the set value of the core thermal power for power regulation. When introducing the load power step change, the core thermal power change trend is consistent with the load power, and the control effect is satisfactory. The research results of this paper can provide reference for the design of power control system of natural circulation fast reactor.
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