Method for analyzing reliability of standby redundant system on basis of fault tree

Abstract

The invention discloses a method for analyzing reliability of a standby redundant system on the basis of a fault tree. The method comprises: establishing a fault tree model of the standby redundant system; carrying out qualitative analysis on the established fault tree; on the basis of a qualitative analysis result, carrying out quantitative analysis on the fault tree. When the fault tree model ofthe standby redundant system is established, according to a system-subsystem-equipment-equipment failure mode sequence, a system-redundant row model, a sequence failure group and a model of a sequence dependence relationship among redundant rows, equipment and equipment failure modes are sequentially established, and each equipment failure mode is completely analyzed and used as a lowermost layerevent. According to the fault tree modeling and analysis method disclosed by the invention, a more real system failure path is described, a system failure probability is subjected to more accurate quantitative evaluation, the unnecessary conservative property possibly introduced in an original fault tree method is eliminated, and more accurate estimation on the reliability level of the system isimplemented.

Description

technical field [0001] The invention relates to the technical field of data analysis, in particular to a method for analyzing the reliability of a bypass redundancy system based on a fault tree. Background technique [0002] The fault tree analysis method is a system reliability evaluation method widely used in the nuclear industry. It can quantitatively evaluate the reliability level of the system, and can qualitatively describe the path of system failure (that is, the human error or equipment failure that leads to system failure). failure combination). Redundant design, that is, redundant functional modules that set redundant system capability requirements for a function, is a common design measure for nuclear power plants to improve their system reliability. According to the input time and control mode of the redundant units, the redundant system can be divided into parallel redundant and bypass redundant. Under the same resource configuration (such as the same equipment...

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Problems solved by technology

[0003] At this stage, the fault tree analysis commonly used in the nuclear industry does not distinguish between the two designs, but analyzes and calculates them as a parallel redundancy, which will lead to inaccurate system reliability prediction and failure path description, which will affect the system reliability. Management creates uncertainty

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