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核电厂隔离阀下游取压管线断裂原因分析

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某核电厂在机组启机升功率期间一隔离阀下游取压管线断裂,造成大量蒸汽泄漏.通过现场工况、化学成分、硬度、微观组织及断口微观形貌等手段分析,发现取压管线材料组织碳化物夹杂较高,焊接区域存在焊瘤,焊接热影响区组织粗大且存在软化现象,焊接质量较差.管道在安装时存在较大约束力,同时在振动载荷的作用下导致疲劳开裂,裂纹起源于焊趾根部并发生扩展,直至断裂.
Fracture Analysis of Pressure Tapping Pipeline Downstream of Isolation Valve in Nuclear Power Plant
During the unit startup and power increase,the pressure tapping pipeline downstream of an isolation valve was broken,resulting in a large amount of steam leakage.The pipeline was analyzed by field working conditions,chemical composition,hardness,microstructure and fracture micro morphology.It was found that there were high carbide inclusions in the material structure of the pressure tapping pipeline,weld beading in the welding area,coarse microstructure and softening in the welding heat affected zone,and poor welding quality.The pipeline had significant constraints during installation,and under the action of vibration loads,it lead to fatigue cracking.The crack originated at the root of the weld toe and propagates until it fractured.

pressure tapping pipelinecarbidesweld beadfatigue cracking

胡斌、胡则栋、许思卓、胡明磊

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中核核电运行管理有限公司,浙江 海盐 314300

取压管线 碳化物 焊瘤 疲劳开裂

2024

全面腐蚀控制
中国工业防腐蚀技术协会

全面腐蚀控制

影响因子:0.278
ISSN:1008-7818
年,卷(期):2024.38(10)