Design Optimization Of Reactor Coolant Main Circulation Pump

Reactor coolant pump is an important component in nuclear power plant, whose weightis the important influence factor on the overall weight and the arrangement of nuclear powerplant. In this thesis, canned reactor coolant pump was taken as the research object, whoseoptimization design was carried out based on a colony complex algorithm, which was aself-developed method. In view of the fact that the motor is one of the principal andlarge-scale components of canned reactor coolant pump, whose weight is considerable, theoptimization design of the motor’s weight is also carried out, based on self-developedmapping crossover genetic algorithm for obtaining the minimum weight of the canned reactorcoolant pump.On the basis of literature research, complex algorithm was selected to optimize cannedreactor coolant pump, and genetic algorithm was selected to optimize canned motor.Improvements were made to overcome the disadvantages of the standard complex algorithmand the standard genetic algorithm. Then, colony complex algorithm and mapping crossovergenetic algorithm with better performance were gained. In this paper, the mathematic modelof canned reactor coolant pump and canned motor were presented, and the correspondingcodes were also developed with C#program language. The sensitivity analysis of operationparameters and structural parameters which influenced the weights of canned reactor coolantpump and canned motor were also made. The results reflected the extents and the trends ofdesign parameters on the objective functions. The effect analysis of parameters on cannedmotor’s design performance was also considered to select optimization variables of cannedmotor. The composite optimization design of canned reactor coolant pump and its inner motorwas carried out under the corresponding restriction conditions. The flow coastdown transientof the optimal pump was analyzed to verify whether the optimal results were available.Composite optimization design results display that the weight of reactor coolant pumpcan be reasonably reduced by the reasonable combination of optimization variables. Theoptimized weight has reduced by11.962%. It can be seen that the optimization effect isobvious. The single optimization design results of canned reactor coolant pump show that theweight of reactor coolant pump has reduced by7.538%, which is less than composite optimization design results. The optimization effect of the latter is more obvious. The flowcoastdown transient analysis indicates that the flow coastdown transient period of theoptimized canned motor pump meet the transient design requirements. Optimized cannedreactor coolant pump is better able to guarantee reactor core safety in flow coastdown period.The optimized results show the feasibility of canned reactor coolant pump optimizationdesign in the theory. The transient analysis verifies that the optimization design method isvalid and effective. The method could provide reference for the engineering design.