Structural Analysis Of Impeller Of Coolant Pump In A Pressurized Water Reactor

The reactor coolant pump(hereinafter referred to as RCP)as a loop system device in the reactor coolant system to drive coolant circulation,is located in the heart location of the nuclear island,which belongs to the nuclear I level security pump.It makes the coolant into the steam generator to generate thermal energy,directly related to the operation status of the whole reactor and safety performance.In the design of the main pump,must select the appropriate model and study on the corresponding operating conditions of stress,strain,deformation,vibration characteristics and fatigue design requirements,so as to ensure its high safety and good economy.Therefore,the use of advanced research methods to reveal the structure stress of the main pump in the operation condition,to accurately reveal the relevant laws,to ensure the safety of its operation is of great significance.In this paper,we configure a FM 3D model for the reactor coolant pump of Hualong one in Fuqing,Fujian province.The numerical simulation method is used to analyze the structural stress,strain,deformation and vibration characteristics of the impeller under working conditions,and the model is verified to meet the requirements of fatigue design.The main work and research results of this paper include:1.The development process and research status of the main pump are summarized,and a brief analysis is made.According to the operation parameters of the RCP(The type is M310)and pump design theory,the main pump impeller model which is suitable for computer simulation calculation is designed.2.By using Solid Works and ANSYS Workbench software,the 3D model and mesh generation of the pump impeller were carried out.The governing equations of the structural stress field calculation,the discrete solution method and the partition technology are briefly introduced.3.The results show that the area of the maximum deformation located at the edge of the impeller blades.And the largest stress and the largest strain occur in the rib root of the blade at the impeller outlet position.We identified hazardous areas caused by the structural fatigue.And we found that the results of stress,strain and total deformation are decreased with the increase of the thickness of rib root.4.By means of modal analysis,the PSD response spectrum of the deformation in frequency domain is obtained.Three interval method is used to verify that the structure meets the requirements of fatigue design.Through the above work and related results,it can provide help and reference for the maintenance and design of the impeller of the reactor coolant pump of M310.