ADS subcritical reactor core power control based on external neutron source intensity

[Background] Accelerator driven subcritical system (ADS) can be used for power generation, proliferation and transmutation. China initiative accelerator driven system (CIADS) is a self-designed ADS research facility in China. It only relies on the intensity of neutron source outside the accelerator to regulate the core power. [Purpose] This study aims to accurately regulate power in transient conditions to ensure the transient safety of the reactor based on the strength of external neutron source. [Methods] The lumped parameter method was used to establish the core nonlinear model of CIADS, and the micro-disturbance linearization method was used to linearize the core nonlinear model. Dual-input and dual-output core state space model was established, and core power fuzzy proportional integral derivative (PID) controller was designed to carry out disturbance control simulation to obtain the core control response characteristics of CIADS. [Results and Conclusion] The simulation results show that the use of fuzzy PID controller can achieve good control of core relative power under the different external neutron source relative intensity disturbance or core inlet temperature disturbance. (authors)