堆焊修复的裂纹管道的失效评价方法  

Failure Estimation Method for Cracked Pipe Repaired with Weld Overlay Method

作　　者：李银生 LI Yinsheng(Japan Atomic Energy Agency,Ibaraki 319-1195 Japan)

机构地区：[1]日本原子能研究开发机构

出　　处：《西华大学学报（自然科学版）》2020年第1期12-22,共11页Journal of Xihua University:Natural Science Edition

摘　　要：经过长期运营的核电站,由于疲劳以及应力腐蚀等老化现象,其管道系统会出现裂纹。对含有裂纹的管道,美国机械工程师协会锅炉和压力容器规范第11卷给出了在管道外部进行堆焊的WOL修复法,但对修复后管道的失效评价和原管存在裂纹时的评价方法一致,是单一材料构成的含有裂纹管道的失效评价方法。针对这一问题,本文在简要介绍WOL修复法的基础上,推导了由WOL修复法修复的双层结构管道的失效评价方法,并利用已有的奥氏体不锈钢管的实验数据对失效评价方法进行验证,结果表明该方法是有效的,可应用于工程实际。Flaw may be initiated in the piping systems in long-term operation nuclear power plants due to the age-related degradations such as fatigue or stress corrosion cracking.For cracked pipes,a weld overlay repair method has been provided in ASME BPV Code Section XI.However,the failure evaluation of the repaired pipe is the same as that of the original pipe with cracks,which is a failure evaluation method for cracked pipe made of a kind of material.Addressing this issue,in this paper,the brief description of this repair method is provided.The failure evaluation method of double-layer structure pipeline repaired by WOL repair method is derived,and the failure evaluation method is verified by using the existing experimental data of austenitic stainless steel pipe.The results show that the method is effective and can be applied to engineering.

关 键 词：核电站 管道系统 应力腐蚀开裂 WOL修复法 失效评价方法 纯截面应力 

分 类 号：TH132[机械工程—机械制造及自动化] O344[理学—固体力学]