Dynamic modeling and characteristic analysis of the double-reactor and quadruple-turbine nuclear power system based on steam main-pipeline distribution characteristics

Motivated by the insufficient insights on the dynamic characteristics of the double-reactor and quadruple-turbine nuclear power system (DQNPS) and the lack of the distributed-parameter model of the steam main-pipeline (SMP), the full-system dynamic model of the DQNPS is developed based on the conservation of mass, energy, and momentum in this work, where the SMP is modeled using discrete approximate distributed-parameter modelling method. Dynamic behavior analysis is then carried out on the validated model, through which, the dynamic characteristics of key variables, such as the steam pres-sures in the SMP are investigated in detail under the four typical step disturbances. The simulation results show that the DQNPS is of high nonlinearity and strongly coupled among multi-variables, and that the steam pressures in the SMP exhibit obvious distributed-characteristic which is the root cause of load redistribution in the DQNPS. Furthermore, it can be obtained from the simulations that the steam gener-ators and the SMP in the DQNPS has the strong ability of energy-storage, which is valuable for the control of the system. The simulation results in this work can provide a useful reference for research on modeling and control of multi-reactor nuclear power system.(c) 2022 Elsevier Ltd. All rights reserved.