Quantitative risk assessment procedure, hazard evaluation procedures

This chapter provides general information for performing qualitative or quantitative risk assessments on buildings in process plants. For detailed guidance on risk assessment techniques, the user is referred to other CCPS books on this subject, including Reference 3, Guidelines for Hazard Evaluation Procedures, Second Edition, and Reference 4, Guidelines for Chemical Process Quantitative Risk Analysis. 

The Directive defines a system for the classification and categorization of substances according to their hazard potential. Risk assessment, evaluating hazard in the context of quantitative exposure information, is not carried out [3]. Generally, the classification and categorization procedure is conducted by a committee of National Experts who represent Member States. If necessary, a committee of Specialized Experts in a particul field may be convened to review the scientific evidence and attempt to reach a consensus. 

The terminology used varies considerably. Hazard identification and risk assessment are sometimes combined into a general category called hazard evaluation. Risk assessment is sometimes called hazard analysis. A risk assessment procedure that determines probabilities is frequently called probabilistic risk assessment (PRA), whereas a procedure that determines probability and consequences is called quantitative risk analysis (QRA). 

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