Quantitative Risk Assessment (QRA) is a technique for the evaluation and integration of hazard frequency and consequence to derive a numerical estimate of risk.
In the context of facility and activity risk assessment, QRA shall be applied when:
- High-risk or Major Accident Hazards have been identified for a facility or operation; QRA shall be required to demonstrate tolerability and ALARP in support of a project or facility COMAH Report.
- There is potentially high risk of exposure to workers or the public (e.g. sour field developments, drilling activities close to populated areas, etc.).
The main objectives of a QRA are:
- Quantifying the overall risk associated with a facility or activity;
- Identifying the main contributors to the overall risk;
- Identifying measures to reduce the overall risk and analyzing their effectiveness;
- Where a number of alternative options are available, determining the relative safety and cost effectiveness of the alternatives;
- Assisting in the identification of new alternatives;
- Demonstrating compliance with ADNOC risk tolerability criteria and assisting in the demonstration and achievement of ALARP to all stakeholders;
- Increasing awareness of hazards, scenario-based escalation and mitigation; and
- As an aid to communication to the workforce and third parties of their impact on, and exposure to, risk.