Deterministic safety analysis (henceforth referred to as accident analysis) is an important tool for confirming the adequacy and efficiency of provisions within the defence in depth concept for the safety of nuclear power plants (NPPs). Due to the close interrelation between accident analysis and safety, an analysis that lacks consistency, is incomplete or of poor quality is considered a safety issue for a given NPP. This Safety Report provides practical guidance for performing accident analysis for NPPs with pressurized heavy water reactors, based on present good practice worldwide. It covers all steps required to perform such analyses, including selection of initiating events, acceptance criteria, computer codes, modelling assumptions, the preparation of input, qualification of users, presentation of results and quality assurance.
