CPR1000反应堆压力容器主螺栓孔螺纹力学分析研究

Mechanical Analysis of Main Bolt Hole of CPR1000 Reactor Pressure Vessel

压水型反应堆压力容器采用大口径两体可拆结构,即大直径上封头组件与筒体组件经密布的大型主螺栓联接为密闭容器,依靠主螺栓载荷保证足够的密封储备。法兰螺纹受力关乎反应堆压力容器结构完整性,有必要开展相应的分析研究。应用ANSYS有限元分析软件,对CPR1000反应堆压力容器主螺栓孔螺纹进行受力分析,综合考虑螺纹升角、法兰实际结构形式等多种因素,对比分析了螺纹应力集中系数、剪切应力等结果,梳理出各种因素影响的规律性。通过研究,总结得到了反应堆压力容器主螺栓孔螺纹力学分析方法,为螺纹结构优化设计、相应工程问题处理等提供了有限元数值计算依据。

The pressurized water reactor pressure vessel adopts the structure of large-diameter detachable two bodies,that is,the large-diameter upper head assembly and the cylinder assembly are connected to become a sealed vessel by the densely distributed large-size main bolts,which relies on the load of the main bolts to ensure adequate sealing reserve. The stress of flange thread is related to the structural integrity of reactor pressure vessel,so it is necessary to carry out corresponding analysis and research. The ANSYS software was used to analyze the stress on the threads of the main bolt holes of CPR1000 reactor pressure vessel. Various factors,such as the helix angle of the bolt,the actual structure of the flange were taken into account comprehensively. The results of stress concentration coefficient and shear stress of threads were compared and analyzed,and the influence rules of various factors were combed. Through the study,the mechanical analysis method of the main bolt hole threads of the reactor pressure vessel was obtained by summarization,which provides the finite element numerical calculation basis for the optimization design of the threaded structure and the handling of the corresponding engineering problems.