Common cause failure modelling (CCF) suffers from scarcity of definitive plant experience data. To overcome this a project was started in 1994 to obtain data from nuclear plant operating experience from around the world. Currently 9 countries from North America and Europe are participating in the International Common Cause Failure Data Exchange project, which is operating under the umbrella of the Organisation for Economic Co-operation and Development Nuclear Energy Agency. Data are being collected and the first formal exchange of data between member organisations took place in 1998. Data collection has taken place for centrifugal pumps and emergency diesel generators. Analysis of the data collected has provided a number of insights into the root causes of CCF, the failure mechanisms involved and the measures that have been adopted to prevent recurrence of CCF. Data collection is continuing on a number of further systems.
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