David has developed and calibrated a new generation partial BETA model for assessing common cause failure. Unlike previous models, it takes account of proof-test intervals and involves positive scoring of CCF related features rather than a subjective "range score".

It has been calibrated against 25 field data results and has the facility for further development and calibration by the user. It addresses M out of N redundancy. It is suitable for IEC 61508 analyses.


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