核级管道焊缝可检率优化研究  

Research on Detectable Rate Optimization of Nuclear Grade Pipe Welds

作　　者：武相[1] 崔聪 邬芝胜[1] 蔡鼎阳 赵千里 干依燃 苏应斌[1] 肖韵菲 Wu Xiang;Cui Cong;Wu Zhisheng;Cai Dingyang;Zhao Qianli;Gan Yiran;Su Yingbin;Xiao Yunfei(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China;Nuclear and Radiation Safety Center,MEE,Beijing,100082,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213 [2]生态环境部核与辐射安全中心,北京100082

出　　处：《核动力工程》2024年第6期237-241,共5页Nuclear Power Engineering

摘　　要：核级管道焊缝不可检问题不仅使焊缝抽检比例达不到现行标准要求,而且影响焊缝全寿期内的状态监测,不利于反应堆冷却剂系统运行安全。以浮动式核电站核级管道焊缝役前检查为例,采用描述统计的方法,对焊缝不可检问题进行详细原因分析。分析结果表明焊缝检测成像障碍是造成焊缝不可检的主要因素,焊缝检测不可达因素次之;形成原因涉及设计、安装、结构功能性和设备结构特性等多个方面。针对性提出的优化措施可将焊缝可检率由65.5%至少提升至74%,有效提高了焊缝可检率,保障了系统运行安全。The problem of undetectable welds in nuclear grade pipelines not only makes the weld detectable rate fail to meet the requirements of current standards,but also affects the state monitoring of welds during their life cycle,which is not conducive to the safe operation of reactor coolant system.Taking the pre-service inspection of nuclear grade pipeline welds in floating nuclear power plants as an example,the reasons for the undetectable welds are analyzed in detail by using descriptive statistics.The analysis results show that the imaging obstacle of weld detection is the main factor causing the weld to be undetectable,followed by the inaccessible factor of weld detection.The reasons are related to design,installation,structural functionality and equipment structural characteristics.The proposed optimization measures can improve the weld detectable rate from 65.5%to not less than 74%,which effectively improves the weld detectable rate and ensures the safety of the system operation.

关 键 词：可检率 核级管道焊缝 成像障碍 不可达 

分 类 号：TL353[核科学技术—核技术及应用]