核电厂安全级DCS功能模块加速老化试验研究

Study on Accelerating Aging Test for DCS Modules of Nuclear Power Plant Safety Level

对核电厂安全级数字化控制系统(DCS)具体试验需求进行了测试、分析和研究,并介绍采用温度为影响因子的阿伦纽斯加速寿命试验计算模型。测试中不改变元器件、模块失效机理而且不引入新失效模式,通过提高核电厂安全级DCS模块在测试中的试验温度值,可在相对较短的测试时间内获得关于核电厂安全级DCS模块的平均故障间隔时间(MTBF)参数值。分析了温度因子和材料的活化能因子对模块老化试验时间的影响。这不仅为核电厂安全级DCS模块寿命的可靠性试验提供了可行且成本较低的测试方案,而且直接验证了核电厂安全级DCS模块寿命可靠性参数是否满足上层设计要求的数据参考。这不仅有利于测试人员对模块测试全局的掌控,而且为设计人员对模块的迭代优化提供科学输入数据。

The specific test requirements of digital control system(DCS)in nuclear power plant safety level are tested,analyzed and studied.The calculation model of Arrhenius law accelerated life test with temperature as the influencing factor is introduced.In the test,the failure mechanism of components and modules is not changed and new failure mode is not introduced.By increasing the test temperature of safety level DCS module in nuclear power plant,the mean time between failure(MTBF)parameter value of safety level DCS module can be obtained in a relatively short test time.The influence of temperature factor and activation energy factor on the aging test time of the module is analyzed.This not only provides a feasible and low cost test scheme for reliability test of safety class DCS module in nuclear power plant,but also provides data reference to verify whether the life reliability parameters of DCS module of safety level satisfy the requirements of upper level design.This is conducive to the overall control of module testing,and scientific input data for designers to optimize the module iteration is provided.