设备剩余寿命监测系统在田湾核电站的应用

Application of Monitoring System of Residual Cyclic Resource of Equipment in Tianwan NPP

疲劳强度计算是核级设备设计中需要考虑的一项重要内容。设计过程中根据假定的各种设计工况组合,计算整个寿期内疲劳强度能否满足标准规范要求。而设备在役实际运行过程中,其遭受的运行工况和设计工况不可能完全一致,可能偏于保守,有时考虑不周全,设备遭受了设计工况外的瞬态或超过其预定的瞬态次数。因此,掌握设备在运行过程中的实际遭受的疲劳损伤状态就显得尤其重要,这对于掌握设备的安全状态,进行设备的延寿,都具有重要的意义。田湾核电站在国内首次安装了在线疲劳寿命监测系统,利用该系统,发现了1号机组波动管的疲劳损伤较大,为此进一步统计出一个燃料循环周期内波动管的疲劳损伤增长,可用于指导今后机组运行的控制。

Fatigue strength computation is an important item during design of nuclear equipment. According to various combination of design operation conditions, fatigue strength of whole design lifetime is calculated to determine whether it is compliance with requirements of standard and specification. But the actual operation condition is different with design operation condition for in-service equipment, and the design operation condition is possibly conservative than the actual one, and sometimes equipment also experiences unexpected transient state or too much transient state due to inadequate consideration during design. So it is important to know the actual fatigue damage state of in-service equipment, which also has a bearing to know about the safety state and lifetime extension of equipment. The monitoring system of residual cyclic resource was first installed in Tianwan NPP in China, and large fatigue strength is found in surge line. Further, increase of fatigue damage of surgeline is counted during a whole fuel cycle, and which can be used to direct the control of follow-up unit operation.