The Investigation About the Ultrasonic Inspection of RPV Safe end Dissimilar Metal Weld
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摘要: 堆焊层、奥氏体粗晶材料的存在以及焊缝几何结构的复杂性使得反应堆压力容器安全端异种金属焊缝的超声检查非常具有挑战性。为提高安全端异种金属焊缝超声检查的可靠性和检查效率，利用常规双晶纵波检查技术及相控阵检查技术开展了安全端异种金属焊缝超声检查技术研究。试验结果表明，常规双晶纵波检查技术及相控阵检查技术均可有效检出安全端异种金属焊缝中的缺陷，且缺陷定量精度满足相关规范要求。其中，常规双晶纵波检查技术现已应用到核电站的役前检查及在役检查中，相控阵检查技术的缺陷定量精度及检查效率均优于常规双晶纵波检查技术。Abstract: The ultrasonic inspection of reactor pressure vessel(RPV) safe end dissimilar metal welds is a challenging task because of the existence of cladding and austenitic coarse grain and complicated geometry of dissimilar metal welds. In order to improve the reliability and efficiency of ultrasonic inspection of safe end dissimilar metal welds, the conventional dual elements longitudinal wave(TRL) inspection technology and phased array(PA) inspection technology has been investigated in this paper. The results of examination indicated that TRL and PA inspection technology could detect the defects of dissimilar metal welds effectively, and the precision of defects sizing met the requirements of related rules. Hence, TRL inspection technology has been applied to the pre-service and in-service inspection of nuclear power plant; the accuracy of defect sizing and efficiency of PA inspection technology was better than that of TRL inspection technology.
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[1] In-service inspection rules for the mechanical components of PWR nuclear islands(RSE-M, 2nd modification-February 2000) BinderⅠ, Section B, B4200［S］. [2] HUDGELL R J. Handbook on the ultrasonic examination of austenitic clad steel components［R］. European Commission, Joint Research Carter Institute of Advanced Material,1994. [3] EDELMANN X. Handbook on the ultrasonic examination of austenitic welds［R］. European Commission, Joint Research Carter Institute of Advanced Material,1984.
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