The flow accelerated corrosion ( FAC) is one of the main causes for carbon steel pipe failure in the sec-ondary loop piping system in nuclear power plants. Based on the residual intensity appraisal method for corroded pipes and the code for seismic design of pressure pipe-RCC-M code for the PWR nuclear islands, the ultimate stress failure equation is derived to calculate the seismic time-dependent reliability for corroded pipes in a nuclear secondary loop piping system. Based on the first order second moment method ( JC) with different failure pressure models, the seismic reliability of corroded pipes in a nuclear secondary loop piping system is calculated in order to demonstrate the dynamic variation of the seismic reliability index induced by FAC.%流动加速腐蚀( FAC)是造成核电厂二回路碳钢管道失效的主要原因之一. 根据腐蚀管道剩余强度评价方法和核电厂承压管道抗震设计规范RCC-M,提出了基于应力的失效极限状态方程对二回路腐蚀缺陷管道抗震可靠度进行计算. 通过不同腐蚀管道剩余强度评价方法,采用一次二阶矩( JC)法分析了二回路腐蚀管道的时变抗震可靠性指标,得到了流动加速腐蚀管道抗震可靠性随运行年限的演化规律,对核电二回路管道的评估和修复提供参考.
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