Loss of safety assessment and the IEC 61508 standard |
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Authors: | Per Hokstad Kjell Corneliussen |
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Affiliation: | Department of Safety and Reliability, SINTEF Industrial Management, Trondheim N-7465, Norway |
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Abstract: | The standard IEC 61508 contains a lot of useful information and guidance for safety improvement regarding the use of safety systems. However, some of the basic concepts and methods for loss of safety quantification are somewhat confusing. This paper discusses the failure classification, the various contributions to the safety unavailability, and in particular the common cause failure (CCF) model presented in this standard. Suggestions for clarifications and improvements are provided. In particular, a new CCF model is suggested, denoted the Multiple Beta Factor model. |
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Keywords: | IEC 61508 Safety unavailability Failure classification Common cause failures Multiple beta factor model Probability of failure on demand |
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