Difference between revisions of "Common Cause Failure"
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| − | <big>A common cause failure (CCF) is a failure where: | + | <big>A common cause failure (CCF) - also refered to as Common Mode Failure - is a failure where: |
* The function of multiple [[CI]] is disrupted or destroyed by the same cause or [[hazard]] affecting the [[CI]] at the same location or area in the same time frame (e.g., a hurricane blocking roads and affecting telecommunication and power lines; a collapsed bridge which blocks inland shipping, road transport and caused disruption of gas, power and telecommunication lines) | * The function of multiple [[CI]] is disrupted or destroyed by the same cause or [[hazard]] affecting the [[CI]] at the same location or area in the same time frame (e.g., a hurricane blocking roads and affecting telecommunication and power lines; a collapsed bridge which blocks inland shipping, road transport and caused disruption of gas, power and telecommunication lines) | ||
* Item failures result from a single shared cause and coupling factor (or mechanism)</big> | * Item failures result from a single shared cause and coupling factor (or mechanism)</big> | ||
Revision as of 22:48, 23 May 2015
A common cause failure (CCF) - also refered to as Common Mode Failure - is a failure where:
- The function of multiple CI is disrupted or destroyed by the same cause or hazard affecting the CI at the same location or area in the same time frame (e.g., a hurricane blocking roads and affecting telecommunication and power lines; a collapsed bridge which blocks inland shipping, road transport and caused disruption of gas, power and telecommunication lines)
- Item failures result from a single shared cause and coupling factor (or mechanism)
Contents
Definitions
European Definitions
Other International Definitions
United Nations’ Definition
National Definitions
Australia
Common mode failure is the coincident failure of two or more independent components as the result of a single cause; of particular concern in an instrument system incorporating redundancy where an event causes coincident failure of two or more of the normally independent channels. [1]
Standard Definition
Discussion Topic
See also
- Geographical dependency - incorrect term often used for Common cause failure
