Introduction

Abstract

Probabilistic safety assessment (PSA) is the systematic process of constructing and quantifying a model representing risk, wherein either the likelihood or the consequences or both are treated in a probabilistic fashion. PSA identifies, probabilistically, the scenarios initiating and leading to the undesired outcome, the likelihood of said scenarios, and the magnitude of the consequences. These three items, the scenario, the likelihood, and the negative consequences, form the basis of the risk triplet for the ith scenario.