钠冷快堆电机辅助绕组可靠性试验及基于极限应力的可靠性评估

Reliability Test and Reliability Evaluation Based on Ultimate Stress of Auxiliary Winding in Sodium-cooled Fast Reactor Motor

主循环钠泵辅助电机执行在事故情况下带动主泵运转,以排出堆芯余热的安全功能。若事故情况下辅助电机发生故障,则可能给整个反应堆系统带来灾难性的后果。绕组是辅助电机的关键部件和薄弱环节。为评价主循环钠泵辅助电机绕组可靠度,设计、开展了一系列可靠性试验;在恒定应力加速试验中,无失效产生,继而进行步进应力加速试验,得到了关于产品极限应力的信息。基于有限的试验信息,给出了一种利用产品极限应力计算得到产品的激活能,从而进行辅助电机绕组可靠性评估方法。评估结果良好,且符合工程经验,验证了辅助电机寿命可靠度满足系统要求。同时,所提出的方法对高可靠性产品无失效数据的可靠度评估提供一种参考方案,具有一定的指导意义。

The auxiliary motor of the main circulating sodium pump performs the safety function to discharge the residual heat of the core in the event of an accident.If the auxiliary motor fails in an accident,it may bring catastrophic consequences to the entire reactor system.Winding is the key component and weak link of auxiliary motor.In order to evaluate the reliability of the auxiliary motor winding of the main circulation sodium pump,a series of reliability tests were designed and carried out.However,no failure occurred in the constant stress accelerated test,and only the information about the ultimate stress was obtained in the step stress accelerated test.Based on the limited information,a method of using the ultimate stress to calculate the conservative estimate of activation energy and the derivation process were given.The evaluation result is good and conforms to the engineering experience,which verifies that the service life reliability of the auxiliary motor meets the system requirements.At the same time,the proposed method provides a reference scheme for the reliability evaluation of high reliability products without failure data,and has certain guiding significance.