NuclearPowerTechnology
核电技术
对AP1000堆芯补水箱裂纹
产生原因的分析
蔡科鸿
（国核工程有限公司，上海200233）
摘要：三门核电站2号机组两台AP1000堆芯补水箱在制造过程中先后发生筒体堆焊层二次下裂纹间题，通过对现场二次UT缺陷分布类比、母材及堆焊层缺陷处材料化学成分分析对比、硬度试验、金相照片和复膜金相照片观察，对堆焊工艺、技术方面的间题进行了分析与研究，初步确定了裂纹产生的根本原因，并提出一些工艺质量控制措施，旨在为避免今后发生类似间题，为提高主设备制造质量提供一些参考与借鉴。
关键词：堆焊层，下裂纹，延迟裂纹，超声波（UT）显示
中图分类号：TL38文献标志码：A文章编号：1674-1617(2014)01-0024-07
ReasonAnalysisforCrackingofAP10o0
CoreMake-upTankShell
CAIKe-hong
(State Nuclear Power Engineering Co.,Ltd.,Shanghai 200233,China)
Abstract:Based on the quality issues about the under-clad cracking for inside surfacing layer of the two AP1000 core make-up tank shells for Sanmen 2,analysis and study on the technical process and quality control are carried out according to theanalysis and contrast of chemical compositions,comparison of two UT defects distribution,hardness test,metallographic analysis and laminating metallographic observation on site. The root cause of the crack is preliminarily identified, and some
technical quality control measures
putforward，withanaimtoprovidesome
reference for avoiding similar problems in the future and improving the quality of main equipmentmanufacturing.
Key words: surfacing welding cladding; under-clad cracking, deferred crack, ultrasonictest(UT)indication
CLC number:TL38 Article character:AArtiele ID:1674-1617(2014)01-0024-07 收稿日期：2013-12-05
作者简介：黎科鸿（1971一），男，江苏扬中人，工程师，注册核安全工程师，从事核岛主设备及级件板块的质量监造管理工作， 24