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Determination method for reliability of system with common cause failure in GO method

A technology for determining method and reliability, applied in the field of system reliability analysis, can solve problems such as complicated calculation process, long calculation time, complicated programming, etc., and achieve the effect of simple concept, high accuracy and easy implementation

Inactive Publication Date: 2013-01-16
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

[0012] The disadvantage of the above system failure probability calculation method is that the required program involves symbols or string operations, the programming is complicated, and the calculation takes a long time; for each common factor group, the system failure probability needs to be calculated twice, and the calculation process is complicated

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  • Determination method for reliability of system with common cause failure in GO method
  • Determination method for reliability of system with common cause failure in GO method
  • Determination method for reliability of system with common cause failure in GO method

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with embodiments.

[0026] In the GO method provided by the present invention, the calculation formula of the reliability determination method when the system has a common cause failure is as follows:

[0027] Q=Q I +Q C

[0028] Where Q I Is the failure probability that the system does not contain common cause failure; Q C The system only contains the failure probability of common cause failure.

[0029] Q I The calculation of is the same as in the grouping method (a well-known technique).

[0030] Q C The calculation steps are as follows:

[0031] 1. Based on the original system GO diagram, all components in the common cause group are replaced with equivalent common cause failure components. Common cause failure is the simultaneous failure of multiple components due to the common reasons of space, environment, design and human factors. It is a dependent failure event. The failure events of each component are...

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Abstract

The invention belongs to the technical field of system reliability analysis, and particularly relates to a determination method for the reliability of a system with a common cause failure in a GO (goal oriented) method. The determination method comprises the steps that all components in a common cause group are replaced by equivalent common cause failure components, and a replacement GO chart is obtained; the quantification analysis is conducted on the GO chart; the fault probability of the system including only the common cause failure is obtained; and the fault probability of the system considering the common cause failure is the obtained fault probability of the system including only the common cause failure plus the fault probability of the system without the common cause failure. The determination method can process different common cause groups at the same time through the quantification replacement GO chart, and is simple in concept, convenient to implement, high in precision and suitable for engineering application.

Description

Technical field [0001] The invention belongs to the technical field of system reliability analysis, and specifically relates to a method for determining reliability when a system has common cause failures in a GO method. Background technique [0002] Common Cause Failure (CCF) is a dependent failure (Dependent Failure), which means that multiple redundant components fail at the same time or within a short time interval due to a common cause. Dependent failure events can cause the destruction of system redundancy. Operating experience and various risk studies have reached a consistent conclusion: the contribution of dependent failures to accidents is often dominant. Dependent failures can be roughly divided into three types: common cause trigger events, inter-system dependence and inter-unit dependence. A special type of dependent failure of concern in the field of nuclear safety is common cause failure, which is a situation in which several equipment or systems fail simultaneous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/44
Inventor 王任泽张建岗
Owner CHINA INST FOR RADIATION PROTECTION
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