Abstract
By the end of 1987 the number of nucler power plants operated worldwide exceeded 400 units and the amount of reactor operation years went over 4500. Under normal operating conditions the nuclear power sources do not release any amounts of radioactive products to the environment harmful to the public health. However, as for any other engineered installation, analyses are to be made of situations that could occur in case of a potential accident. The paper described both the deterministic and the probabilistic approaches applied to these analyses. Within others, typical listings for the compilation of postulated initiating events for a possible accident are shown and the use of the IAEA Safety Codes and Guides is explained. The IAEA is contributing to improving operational safety worldwide by means of its Operational Safety Review Teams (OSARTs) and provides also for the international exchange of experience by the feedback of the established Incident Reporting System (IRS) but this is not discussed in detail in the paper. Expected developments in nuclear safety are discussed in the concluding part of the paper.
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