An event having a 100-year return period, or an annual exceedence probability of 1 %.
Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards
An extreme metocean, seismic, and/or ice condition that a structure may be subjected to during its operational life.
Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards