TABLE OF CONTENTS The objective of a safety analysis is to help define and to confirm, through adequate analysis tools, the safety basis for the parts of the plant which are important for safety and to ensure that the general design of the plant is capable of complying with the dose limits in force and with the radioactive releases specified for any plant conditions. AR17
Safety analyses, which are a part of the safety evaluations used in the licensing procedure of the plant, should proceed in parallel with the design, with interactions between the two activities. They must be kept up to date during the life of the plant in order to account for the progress of knowledge and in case of plant or site modifications.
The deterministic approach studies the behaviour of the plant in operational states and under specific accident conditions originally identified on the basis of evaluations of prudent engineering or for compliance with the chosen criteria. Today, probabilistic techniques are sometimes used to aid decisions concerning the deterministic approach, for example if a new candidate appears (e.g. from research or operating experience) for inclusion in the list of Design Basis Accidents (DBAs), the decision on inclusion or not can be aided by a probabilistic comparison with other situations already inserted in the DBA list. Usually the deterministic analyses are performed using conservative assumptions on input data, intermediate parameters for the analyses and on the behaviour of plant systems (single failure, etc.). Consequently, the...
