The probability of a never event is also approx. 3 x 10-5 (1 per 31,144 procedures; Simcock, 2018). About as reliable as you’d find in any field of work, esp. complex work. The term itself is problematic and incompatible with risk-based (ALARP) approach.https://twitter.com/c7rky/status/948169919266422784 …
At no point have I seriously expected Never Events to never happen. That said, I'm still rather fond of the term, as I always thought it captured the extreme nature of the negligence involved. If safety procedures were ALWAYS followed, never events are supposed to be impossible.
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But the data show that: The probability of Never Events is as low as for any complex task in any industry (human reliability doesn’t get much better than 99.997%) Resources are often suboptimal/not as designed/imagined (e.g. checklist implementation, staffing, workload, pressure)
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So in other industries, “so far as is reasonably practicable” is applied (as per U.K. law regarding health and safety at work). This translates to as low as reasonably practicable, which requires a considered, risk-based approach (nuclear, aviation, oil and gas, chemical).
End of conversation
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