核电站主蒸汽超级管道管嘴受力分析

Force Analysis on Main Steam Super Pipe Mouthpiece of Nuclear Power Station

对核电机组超级管道连接主蒸汽安全阀的挤压成型管嘴的受力情况进行分析,介绍了超级管道挤压管嘴的基本结构,使用ABAQUS 6.1.0版有限元分析软件对RCC-M中规定的5类工况进行计算,各工况下的有限元分析结果均未超出RCC-M规定的限值,满足设计要求。从5类工况的三维应力分布图可以直观地看出挤压成型管嘴应力最集中的部位是沿管道轴向的管嘴根部,而不是沿管道径向的管嘴根部。指出在设计和制造过程中需要特别注意该部位的内外表面弧度对超级管道整体强度的影响,确保过渡区圆弧的连续性,避免因轮廓不连续而造成应力集中。

This paper analyzes force of mouthpiece formed by extrusion of super pipe of nuclear unit which is connected with main steam safety valve and introduces basic structure of extruded mouthpiece. By using ABAQUS 6.1.0 ANSYS , it calcu- lates five kinds working conditions provided in RCC-M. Each calculating result under different working conditions dose not exceed limited value provided and can satisfy design requirements. It is intuitionally perceived from three-dimensional stress distribution graph that the most centralized part of stress is the root of mouthpiece along axial pipe instead of radial pipe. It points out to specially pay attention to affection on the whole strength of the pipe by inside and outside radian of this part in order to ensure continuity of transition zone arc and avoid stress centralization caused by discontinuous outline.