Difference between revisions of "Common Cause Failure"
Jump to navigation
Jump to search
(→National Definitions) |
|||
| Line 22: | Line 22: | ||
==== Australia ==== | ==== Australia ==== | ||
{{definition|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 |redundancy]] where an [[event]] causes coincident failure of two or more of the normally independent channels. <ref name="MAIMAus">[https://www.em.gov.au/Documents/Manual03-AEMGlossary.PDF Australian Emergency Management Glossary, Emergency Management Australia (1998)]</ref>}}<br /> | {{definition|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 |redundancy]] where an [[event]] causes coincident failure of two or more of the normally independent channels. <ref name="MAIMAus">[https://www.em.gov.au/Documents/Manual03-AEMGlossary.PDF Australian Emergency Management Glossary, Emergency Management Australia (1998)]</ref>}}<br /> | ||
| + | |||
| + | === International Definitions === | ||
| + | ==== IAEA ==== | ||
| + | {{definition|Common cause failure is the failure of two or more structures, systems or components due to a single event or cause. <ref name="IAEA">[http://www-pub.iaea.org/mtcd/publications/pdf/pub1290_web.pdf IAEA Safety Glossary (2007)]</ref>}}<br /> | ||
| + | {{definition|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. <ref name="IAEA">[http://www-pub.iaea.org/mtcd/publications/pdf/pub1290_web.pdf IAEA Safety Glossary (2007)]</ref>}}<br /> | ||
===Standard Definition=== | ===Standard Definition=== | ||
Revision as of 23:54, 7 June 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]
International Definitions
IAEA
Common cause failure is the failure of two or more structures, systems or components due to a single event or cause. [2]
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. [2]
Standard Definition
Discussion Topic
See also
- Geographical dependency - incorrect term often used for Common cause failure
