核电堆内构件围板螺栓超声检测优化有限元仿真研究  

Finite element simulation study on optimization of ultrasonic detection for baffle bolts of nuclear power reactor internals

作　　者：刘登荣 刘天浩[1] 裴翠祥[1] 蔡文路[1] 汤建帮 马官兵 吴宇坤 LIU Dengrong;LIU Tianhao;PEI Cuixiang;CAI Wenlu;TANG Jianbang;MA Guanbing;WU Yukun(Xian Jiaotong University,Xi'an 710049,China;CGNPC Inspection Technology Co.,Ltd,Suzhou 215026,China)

机构地区：[1]西安交通大学,西安710049 [2]中广核检测技术有限公司,苏州215026

出　　处：《应用声学》2023年第6期1148-1155,共8页Journal of Applied Acoustics

基　　金：国家重点研发计划项目(2020YFB1901502)。

摘　　要：围板螺栓是核电堆内构件的关键紧固部件,典型的围板螺栓主要为外六角形式。在长期辐照和震动等恶劣环境服役过程中,其断裂韧性下降,脆性增加,最终导致螺栓退化开裂或断裂脱落,需要对其进行定期无损检测。然而由于其结构的复杂性,现有超声检测方法仍难以对其进行有效检测。为进一步提高超声检测方法对于围板螺栓内部缺陷的检测能力,针对堆内构件围板螺栓典型缺陷失效形式,通过有限元数值仿真技术开展适用于围板螺栓不同区域(螺栓过渡区域、螺杆区域和螺纹区域)的超声检测方法和工艺研究,对超声探头激励频率、晶片尺寸及超声波入射角度等进行优化,实现对不同区域15%缺陷横截面积占比的检测目标。为研发具有高度匹配性和高灵敏度的堆内构件围板螺栓超声传感器、实现对围板螺栓敏感区域的高精度检测提供理论指导。Baffle bolts are the key fastening elements of the internal components in the nuclear power reactor internals,and the typical baffle bolts are mainly in the form of external hexagon.In the process of service in harsh environments such as long-term irradiation and vibration,its fracture toughness decreases and its brittleness increases.Eventually,the bolt degenerates and cracks or breaks off,which requires regular non-destructive testing.However,due to the complexity of its structure,it is still difficult for existing ultrasonic testing methods to effectively detect it.In order to further improve the detection ability of ultrasonic detection methods for internal defects of baffle bolts,this study aims at the typical defect failure forms of baffle bolts of reactor internal components,and carries out ultrasonic detection methods and process studies suitable for different areas of baffle bolts(bolt transition area,screw area and thread area)throughfinite element nu-merical simulation technology.The ultrasonic probe excitation frequency,element size and ultrasonic incidence angle are optimized to achieve the detection goal of 15%of the defect cross-sectional area in different regions.It provides theoretical guidance for the development of an ultrasonic sensor for baffle bolts of internal components with high matching and high sensitivity,and for realizing high-precision detection of the sensitive areas of baffle bolts.

关 键 词：堆内构件 围板螺栓 超声检测 仿真优化 

分 类 号：TG115.28[金属学及工艺—物理冶金]