Individual Risk Per Annum.

Source: NOPSEMA Guidance Note: ALARP, N-04300-GN0166, Australia, Revision 4, December 2012. Regulatory Guidance. Regulatory Guidance


Individual Risk Per Annum (IRPA)

The probability that an individual will become a fatality each year.

Source:  International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC Guidelines

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