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International Society of Science and Applied Technologies |
| Safety-Constrained Optimal Proof-Testing Interval for E/E/PE Safety-Related Systems | ||||
| Author | Shinji Inoue
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| Co-Author(s) | Takaji Fujiwara; Shigeru Yamada
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| Abstract | It is known that proof-testing for E/E/PE safetyrelated systems is a scheduled inspection or maintenance activity to maintain designed safety through the operation of the systems. The proof-testing is a costly and time-consuming activity. Therefore, effective proof-testing intervals should be considered based on the rationale for the risk and maintenance cost. As one of the approaches, there exists methods deriving the proof-testing intervals minimizing simultaneous the proof-testing cost and the risk at hazardous event occurrence. However, the safety constrained is needed to be considered at the same time since the E/E/PE safety-related systems are required to maintain certain safety level in operation. We discuss a mathematical approaches for obtaining optimal proof-testing intervals with addressing such situations.
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| Keywords | E/E/PE safety-related systems, Proof testing, DU fault, Optimal proof-testing interval, Continuous-time Markov chain, Safety objective | |||
| Article #: RQD2024-98 | ||||
Proceedings of 29th ISSAT International Conference on Reliability & Quality in Design |