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Exploring the IEC 61508 Proven-In-Use Concept
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Using chi-square distribution ensures that the dangerous undetected failure rate (λDU) is derived with a defined confidence level (typically 70-90%), forming the basis for PFH/PFDavg calculations used in SIL determination.
Statistical inference from operational experience can bound a system's failure rate without a structured assurance argument
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- https://www.intertek.com/blog/2026/01-22-exploring-the-iec-61508-proven-in-use-concept/
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