Accidental Limit State

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Events with an annual probability of exceedance less than 10^-2 and larger than 10^-4.

NOTE: 1 The accidental limit state (ALS) corresponds to conditions with a longer return period than ULS. ALS requires that the system survive, but has a higher risk of damage than ULS conditions.
NOTE: 2 When considering potential damaged conditions, the damage should not lead to an escalation of undesirable events.
- EXAMPLE A failed mooring line, a flooded compartment, a tensioner failure, a tubing leak or unintended shut in conditions are some ALS cases.

Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

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