The importance of integration of deterministic and probalistic approaches in the framework of integrated risk informed decision making in nuclear reactors

Analysis of nuclear reactor accidents and transients are very necessary for prediction of emergency conditions, being used to control and respond to extreme conditions. The nuclear accident investigation and safety analysis have been performed by either probabilistic or deterministic approaches. In this paper, the recent investigations on combining deterministic, probabilistic approaches and integrated risk informed decision-making (IRIDM) are reviewed in studying of events and making decisions in nuclear reactors. Then, the importance of the combined approaches for more comprehensive integrated risk informed decisions making are presented. By combination of both approaches and using IRIDM, the analysis of nuclear accident can be more realistic and, contrasting design basis accidents (DBAs) and beyond design basis accidents (BDBAs) with high accuracy is possible. Generally, the IRIDM approach can confidently be used in assurance of safety of any type of nuclear reactors.