某核电厂吊篮梁型振幅偏大问题分析与诊断

Analysis and Diagnosis of Problem of Larger Amplitude with Core Barrel Beam Mode in a Nuclear Power Plant

通过对方家山、宁德核电机组多个燃料循环周期的堆外中子噪声信号进行分析,得出了吊篮梁型振动频率和幅度的特性。将此特性应用到其他核电机组,发现某核电机组吊篮梁型振幅偏大。对该机组吊篮梁型振动频率和幅度的变化趋势、频率的漂移量、幅度的增长率进行分析与诊断,判断吊篮并没有发生明显的支撑劣化情况,并给出了该机组可继续运行的条件。

Based on the analysis of the ex-core neutron noise signal in multiple fuel cycles in Fangjiashan and Ningde Nuclear Power Plants, the beam mode vibration frequency and amplitude characteristics of the core barrel is obtained. These characteristics are applied to other nuclear power plants, and the problem of larger amplitude with barrel beam mode in a nuclear power station is found. The trend of beam mode vibration frequency and amplitude, the drift of frequency, and the growth rate of amplitude are analyzed and diagnosed. No obvious support deterioration in the barrel is found, and the condition under which the plant can continue to operate is given.