【作者】 林磊； 遆文新； 龚明祥； 薛飞； 姜节胜； 管欣；

【Author】 LIN Lei~1,TI Wen-xin~1,GONG Ming-xiang~1,XUE Fei~1,JIANG Jie-sheng~2,GUAN Xin~2 (1.Suzhou Nuclear Power Research Institute,Suzhou 215004,China; 2.Northwestern Polytechnical University,Xi’an 710072,China)

【机构】 苏州热工研究院有限公司； 西北工业大学；

【摘要】 某核电厂应急柴油发电机相关的小尺寸管线发生过多次泄漏,厂方拟通过增加支架降低振动水平,以减缓小尺寸管线的开裂。本文通过管系静态应力分析和评估、振动速度和动态应变测量与分析、并在此基础上进行了振动速度和交变应力幅的评估,评估结果表明管系静应力最大位置均位于支管与主管连接的焊缝部位,管道的振动速度超标且交变应力幅较大,支管根部开裂是静应力、振动以及焊缝质量等共同作用的结果。更多还原

【Abstract】 Crack and leak have occured in the branch pipes connected with the cooling water returning pipe of the disel engine in a Nuclear Power Plant.Attempt of adding H-type support between the returning pipe and the turbocharger has been implemented to reduce pipe vibration level and branch cracking.Analysis and assessment of static stress,vibration velocity and alternating stress of the branch pipes shows that maximum stress locates at the welds connected the branches and main pipes,pipes maximum vibration velocity exceeds the allowable value and the alternate stress is too high.Static stress, vibration and welds quality jointly caused the branch pipe cracking.Modification advice to mitigate branch pipe cracking was proposed to the plant based on the analysis and assessment.更多还原