宁德核电站1号机组堆芯吊篮梁型振动特性研究

核电站反应堆堆芯吊篮的振动在一定范围内是允许的;但其异常振动可能会导致故障甚至事故的发生。掌握核电站堆芯吊篮振动特性能够对核电站的安全运行提供保障。运用中子噪声分析技术,对宁德核电站1号机组多个燃料循环周期内的堆外中子噪声信号的自功率谱、互功率谱和相干、相位进行了分析,得到了吊篮梁型振动频率和中子噪声信号峰功率均方根值变化趋势。对核电站堆芯吊篮梁型振动特性的研究成果,为堆芯吊篮早期故障诊断奠定了基础。

Research on vibration characteristics of core barrel beam mode of unit 1 of Ningde nuclear power station

The vibration of the core barrel of nuclear power station is allowed within a certain range, but its abnormal vibration may lead to failure or even accident. Mastering the vibration characteristics of the core barrel of nuclear power station can guarantee the safe operation of nuclear power station. In this paper, the neutron noise analysis technique is used to analyze the self power spectrum, cross power spectrum, coherence and phase of ex-core neutron noise signals in multi fuel cycle of unit 1 of Ningde nuclear power plant. The vibration frequency variation trend of the core barrel beam mode and peak power root mean square variation trend of neutron noise signal are obtained. Research results of the vibration characteristics of the core barrel beam mode in the nuclear power station have laid a foundation for the early fault diagnosis of the core barrel.