Difference between revisions of "Common Cause Failure"
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<big>A common cause failure (CCF) - also refered to as Common Mode Failure - 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]]|critical) infrastructures is disrupted or destroyed by the same cause or [[hazard]] affecting the ([[CI]]|critical) infrastructures 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> | ||
<br /> | <br /> | ||
Revision as of 15:16, 16 April 2018
A common cause failure (CCF) - also refered to as Common Mode Failure - is a failure where:
- The function of multiple (CI|critical) infrastructures is disrupted or destroyed by the same cause or hazard affecting the (CI|critical) infrastructures 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
EWICS
Common Cause Failure is a failure that is the result of one or more events, causing concurrent failures of two or more separate channels in a multiple channel system, leading to a failure. [1]
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. [2]
International Definitions
IAEA
Common Cause Failure is the failure of two or more structures, systems or components due to a single event or cause. [3]
Common mode failure is the failure of two or more structures, systems or components in the same manner or mode due to a single event or cause. [3]
Discussion Topic
See also
- Geographical Dependency - incorrect term often used for Common Cause Failure
