Optimal Critical Rod Position Search Method Based on NSGA-Ⅲ for Pool-type Low-temperature Heating Reactor

The model of optimal critical rod position search method was established in this paper, which was based on fast nondominated sorting genetic algorithm. The optimal critical rod position which meets the thermalhydraulic and safety limit was gotten with the rod position as input, and critical deviation, nuclear hot factor and nuclear enthalpy rise factor as objective functions. A new way to search the optimal critical rod position is provided for boronfree core.