Definition:
Tolerable Mean Event Likelihood (TMEL) is the maximum acceptable frequency for hazardous events consistent with a company’s risk criteria. It is thus related to tolerable risk and calibrated risk matrix.
Key Points:
- Used in SIL selection and LOPA.
- Links hazard consequences with allowable event frequency.
See also: tolerable risk, calibrated risk matrix
Example:
A company policy sets TMEL for single-fatality events at 1E-5/year.
Cited Source:
- CCPS Guidelines for LOPA.