Chapter II - Evaluation of Hazard and Risk Analysis

Abstract

Hazards and risks are very plant specific. So, to address the many varieties of risk there are a number of ways to address them. Detailed selection processes are discussed to select the best one suitable for the plant. Hazard analysis is the primary step toward plant hazard analysis (PHA). A rigorous treatment is presented to focus on various factors with special reference to major incidents and for major hazard facilities (MHFs) and HAZID. In addition to outline discussions on various PHA methods, detailed discussions are presented on task analysis to take into account human action errors. Starting from qualitative risk analysis, various independent protection layers are chosen to arrive at semiquantitative risk analysis. Control measures play a very big role in risk analysis. Detailed discussions are presented to address these control measures so that safety of the facilities can be ensured. For complex systems, quantitative risk analysis (QRA) is quite common, so QRA with statistical approaches is covered. Safety management systems are covered to ensure total safety for MHFs. Detailed dialog on risk analysis and management is also a part of the discussions so that the reader can develop one for any specific plant based on the outline discussions covered.