Abstract

Bushehr nuclear power plant like other nuclear power plants in the world is influenced by various events. These events have internal or external origin. Each of these events in terms of occurrence can release considerable radioactive contaminants amounts that cause regional or global crisis. Internal and external events have common indicators, but what is important is relation between these indicators and its weights to each other. This relation and weights in external events are different from those in internal events. Based on the type of relations and indicators effects on each other and finally its weights, it is possible to reach various external and internal events. In this study, seven indicators are introduced to evaluate the crisis oriented events. These seven indicators can be used to prioritize external and internal crisis oriented events. In this research, using DEMATEL method, the relation and effect of each indicator has been investigated separately for internal and external events. Using this method, it is clear that the indicators, such as variety of effects, have the most effect on others and some indicators, such as reoccurrence, have the impressibility than other indicators.  Determination of the main internal and external events is the most important step to investigate safety for each nuclear power plant, and doing each structural and process design is dependent on events that are potentially able to perform crisis in nuclear power plants. Therefore, further investigations considering reliable data are very vital for such power plants. Based on the International Atomic Energy Agency documents, response planning in critical conditions, crisis management system and international communication system planning at the time of crisis are bonds of nuclear power plants, and according to the critical situation of Bushehr nuclear power plant, which is close to the Persian Gulf, such plannings are the most important infrastructures of safety and usable nuclear power plants.

Key words: External events, internal events, nuclear power plant, DEMATEL, Bushehr.