The following definitions are coordinated with ISO terminology (ISO/IEC Guide 73:2002) where relevant.

A-D

Acceptance criteria (for risk)

Criteria that are used to express a risk level that is considered acceptable for the activity in question, limited to the high level expressions of risk.

Accidental event

Event, or chain of events, that may cause loss of life, health, or damage to environment or assets.

Accidental effect

The result of an accidental event, expressed as heat flux, impact force or energy, acceleration, etc. which is the basis for the safety evaluation.

Acute release

The abrupt or sudden release in the form of a discharge, emission or exposure, usually due to incidents or accidents.

ALARP (As Low as Reasonably Practicable)

ALARP expresses that the risk level is reduced - through a documented and systematic process - so far that no further measure may be identified, except those that have costs that are grossly disproportionate to the benefits.

Barrier element

A component of a barrier system that by itself is not sufficient to perform a barrier function.

Barrier function

A function planned to prevent, control, or mitigate undesired events or accidents.

Barrier (or risk) influencing factor

Conditions that influence on the performance of barrier systems.

Barrier system

Technical, human and/or organisational measures designed and implemented to perform one or more barrier functions.

BLEVE

Boiling liquid expanding vapour explosion, is defined as rupture of a hydrocarbon containing vessel due to being heated by fire loads.

Causal analysis

The process of determining potential...