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Abstract HA262Full Paper + Presentation
The International Common Cause Failure Data Exchange (ICDE) Project – Recent Insights
Common cause failures (CCFs) can significantly impact the availability of safety systems of nuclear power plants. Since CCFs are rare events, it is necessary to combine operating experience from multiple countries to gain a comprehensive knowledge of CCF phenomena. For this reason, the International Common Cause Failure Data Exchange (ICDE) Project was initiated by several countries in 1994. Since 1997 it has been operated within the OECD NEA framework, and the project has been successfully operated over eight consecutive phases (the current ninth phase being 2022 - 2026). The ICDE Project allows countries to collaborate and to exchange CCF data with the aim of generating qualitative and quantitative insights into these failures.
So far, the ICDE Project has published twelve reports on the collection and analysis of CCF events of specific component types (centrifugal pumps, emergency diesel generators, motor operated valves, safety and relief valves, check valves, circuit breakers, level measurement equipment, control rod drive assemblies, heat exchangers, and batteries) and seven topical reports on different topics including multi-unit failure events, CCFs due to external environmental factors, emergency diesel generator CCF events impacting the entire exposed population, CCFs due to plant modifications, improving testing as provision against CCFs, and intersystem CCF events and CCFs due to pre-initiator human failure events. Three additional topical reports on safety culture insights from the analysis of CCF events, guidance on CCF quantification using ICDE data and CCF due to aging are in preparation.
The ICDE Project has significantly improved the knowledge on CCFs. Many insights would not have been gained without combining information from many data sources. This includes, e.g., the finding that the dominant causes of complete CCFs are human actions as a part of component design or operation, rather than manufacturing deficiencies.
This paper presents recent ICDE activities, lessons learnt from the data collection, and results of topical analyses including analyses of CCFs related to deficiencies in safety culture and guidance on CCF quantification using ICDE data.
← Check another abstractSo far, the ICDE Project has published twelve reports on the collection and analysis of CCF events of specific component types (centrifugal pumps, emergency diesel generators, motor operated valves, safety and relief valves, check valves, circuit breakers, level measurement equipment, control rod drive assemblies, heat exchangers, and batteries) and seven topical reports on different topics including multi-unit failure events, CCFs due to external environmental factors, emergency diesel generator CCF events impacting the entire exposed population, CCFs due to plant modifications, improving testing as provision against CCFs, and intersystem CCF events and CCFs due to pre-initiator human failure events. Three additional topical reports on safety culture insights from the analysis of CCF events, guidance on CCF quantification using ICDE data and CCF due to aging are in preparation.
The ICDE Project has significantly improved the knowledge on CCFs. Many insights would not have been gained without combining information from many data sources. This includes, e.g., the finding that the dominant causes of complete CCFs are human actions as a part of component design or operation, rather than manufacturing deficiencies.
This paper presents recent ICDE activities, lessons learnt from the data collection, and results of topical analyses including analyses of CCFs related to deficiencies in safety culture and guidance on CCF quantification using ICDE data.