某核电厂蒸汽发生器水室内松脱事件诊断

Diagnostic of Loose Parts Event in Water Chamber of Steam Generator

某核电厂在热态性能试验(简称热试)期间出现蒸汽发生器松脱部件报警事件,为探究松脱部件报警原因以及评估设备损害程度,需对松脱部件进行及时确认。通过建立松脱部件诊断分析模型,对松脱事件发生时的原始数据进行详细分析,估计了松脱信号的传播速度、松脱部件质量和能量,最后评估了此次松脱报警事件的危害性。结果表明,蒸汽发生器内存在的松脱部件为游动的金属部件,该部件是反应堆内部结构脱落部件,其撞击频率为8700~9300 Hz,碰撞加速度峰值范围为3g~90g,松脱信号传播群速度为3200~3300 m/s,估计松脱部件质量约0.1 kg,撞击能量为0.45~0.89 J;质量和能量诊断结果与实际符合较好,表明本文提出的质量和能量估计方法是有效的。

During the hot performance test in a nuclear power plant,the alarm event of the loose parts of the steam generator occurred.In order to explore the alarm cause for the loose parts and evaluate the damage of the equipment,it is necessary to confirm the loose parts in time.By establishing the diagnosis and analysis model of the loose parts,the original data of the loose event is analyzed in detail,and the propagation speed of the loose signal,the quality and energy of the loose parts are estimated.Finally,the harmfulness of the loose alarm event is evaluated.The results show that the loose part in the steam generator is a moving metal part,which is a loose part of the internal structure of the reactor.The impact frequency of the loose part is 8700~9300 Hz,the peak range of impact acceleration is 3g~90g,the propagation group velocity of the loose signal is 3200~3300 m/s,and the mass of the loose part is estimated to be about 0.1 kg.The impact energy is 0.45~0.89 J.The diagnostic results of mass and energy are in good agreement with the actual situation,which shows that the proposed method is effective.