According to the operational matrix, how can a rarely performed task be deemed safety-critical?

Answer

A task done infrequently, like emergency spill containment, might have a high consequence, making the response role safety-critical even if it happens rarely.

The operational matrix considers potential consequence versus frequency; even infrequent tasks, if they carry a high potential consequence like fatality or major financial loss (e.g., spill containment), render the response role safety-critical.

According to the operational matrix, how can a rarely performed task be deemed safety-critical?
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