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核电厂小支管振动治理和评价

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核电厂存在大量的润滑油、仪表管、排气管等 2 英寸以下的小支管,其机械振动导致的疲劳断裂是运营核电厂经常出现的问题,进而造成系统停运或更加严重的停机停堆.针对核电厂汽轮机润滑、顶轴和盘车系统(GGR)相关小支管出现的振动超标现象,探究了管道振动的根本原因、建立了合理的评价方法,并提出了合理的改造方案.首先,采用现场振动测量和模态试验相结合的方法明确了小支管振动超标的根本原因是结构共振,据此制定了相应的减振改造方案,以避开结构的共振区.然后,从振动幅值的角度评估了改造方案的有效性,结果表明提出的改造方案减振效果明显,改造后的小支管满足相关振动标准和振动疲劳要求,可保证系统和机组的长期安全稳定运行.
Mitigation and Assessment of Small Branch Piping Vibration in Nuclear Plants
In nuclear power plants,small branch pipings(Φ<2 inches)such as steam turbine lubricant pipelines,instru-ment pipelines and gas exhausts frequently encounter mechanical vibration-induced fatigue fractures,which can further lead to system interruption or even unit/reactor shut down.In view of over-standard vibration of lubrication,top shaft and cranking system(GGR),this paper investigated the real fact and established an appropriate assessment method as well as retrofit scheme for mitigating vibrations.First the combination of on-site vibration measurement and modal test clarified that the fundamental cause of the small branch piping excessive vibration was structural resonance.Based on this,the cor-responding retrofit scheme for mitigating vibration was formulated to avoid the resonance zone of the structure.The effec-tiveness of the retrofit scheme was then verified from the perspective of vibration amplitude.The modified small branch pipings were standard-qualified in transient strain and vibration fatigue according to test results,which can ensure the long-term safe and stable operation of the system.

nuclear power plantsmall branch pipingvibration

毛进军、周志贵、李思源、贾易达、王鑫炀

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中核国电漳州能源有限公司,福建 漳州 363300

核电厂 小支管 振动

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(11)