通道缺陷模式下的松动部件撞击试验研究

Research on Loose-Parts Impact Test in Channel Defect Mode

利用在役核电站停堆检修的窗口,对核电站蒸汽发生器进行模拟松动部件撞击的试验,给出了松动部件监测系统(LPMS)在经过长期运行后的主要缺陷模式及处理方法。在指出LPMS故障自检功能中存在的盲区的基础上,分析了存在缺陷的通道对松动部件冲击信号的响应特征。研究表明,通道接触不良、电荷累积和多通道间信号干扰是造成通道信号失真的主要因素;电荷累积会对信号通道造成静电阻塞;多通道间的信号干扰是产生误报警、通道过载断路等现象的重要原因之一。

During the outage of a nuclear power plant, a loose parts impact test was carried out on the steam generator, and the main defect modes and treatment methods of the loose component monitoring system（LPMS） in long-term operation are proposed. The blind area in the function of fault self-checking in LPMS system is given, and the response characteristics of the defective channel to the impact signal of the loose parts are analyzed. Poor channel contact, electric charge accumulation and multi-channel signal interference are the main factors that cause the signal distortion. The accumulation of electric charge causes the static blocking of the signal channel; the signal interference between multiple channels is an important cause for false alarms and channel overload and disconnection.