基于模糊危害性矩阵FMECA的闸阀可靠性分析方法

Reliability analysis on valves based on the fuzzy criticality matrix FMECA

核电厂反应堆截止闸阀具有批量小、造价高、维修检测成本大、试验仿真难度高的特点,在产品设计阶段常采用故障模式影响及危害性分析(Failure Modes,Effect and Criticality Analysis,FMECA)的方法对其可靠性进行评价。在传统FMECA方法的基础上,结合闸阀产品特点,提出了一种基于模糊危害性矩阵的FMECA方法,改良了传统FMECA难以衡量分析人员主观不确定性的问题。针对一款在研的反应堆截止闸阀,对提出的方法进行了验证。与传统FMECA方法相比,文中提出的方法克服了危害性矩阵分析存在的缺陷,提高了分析结果可信度与合理性,为闸阀产品可靠性工作提供了理论支撑与实践验证。

Since nuclear stop valves suffer such setbacks as small batch,high cost,high cost of maintenance and inspection cost,as well as difficulty in test and simulation,the method of Failure Modes,Effect and Criticality Analysis( FMECA) is often adopted for the sake of reliability evaluation. In this article,the FMECA method based on the fuzzy criticality matrix is proposed,based on the traditional FMECA and in combination with the characteristics of valve products. This method improves the subjective uncertainty about criticality ranking in traditional FMECA analysis. It is established by means of a stop valve which is under development,and the key failure modes and weak points of this valve are identified. This method avoids the shortcomings of its traditional counterpart and improves the credibility and rationality of the results,which provides theoretical support and practical verification for the reliability analysis on valve products.