Optimization of forced circulation to natural circulation transition characteristics of IPWR

Abstract

For nuclear power plants, the operating characteristics of the forced circulation to natural circulation are particularly critical. In this paper, a simulation-based optimization method integrating the RELAP5 code and a multi-population genetic algorithm, is applied to investigate the characteristics of transition from forced circulation to natural circulation of the integrated pressurized water reactor. The optimal values of the decision variables: the primary coolant average temperature, the initial power, and main pump shutdown strategy are studied and evaluated by using single objective optimization in MATLAB software. The parameter analysis reveals that the initial plays significance on the transition performance. And shutting down the main pump one by one has a double-edged effect on system stability. Additionally, the optimal operating strategy that enables the integrated pressurized water reactor to transition safely and quickly is also obtained, which could provide an enlightening guidance for the operation of the reactor.