The integrated management system as an auxiliary means for providing data for the probabilistic safety assessment

The results of probabilistic safety analyses (PSA) provide plant-specific reliability parameters which reflect more precisely the plant investigated. These parameters are ascertained by a sufficiently extended study of the individual systems and components. An extension of the study period with regard to the total operational life of a plant is to be recommended in most cases. The cost of preparing the required data and processing it to obtaining plant specific reliability parameters for the components can, however, be considerable. The volume and contents of the operational documentation, including maintenance instructions and recurrent tests, are, in all German power stations, more or less the same in view of the fact that these instructions are laid down by law. The accessibility to the data acquired during operation is dependant on the auxiliary means used for the documentation. At the NPP Emsland a computer-aided integrated management system (IBFS) has being used since its start-up. In this paper the methodical procedure for data supply from the IBFS will be explained. In the IBFS all data of operational events are available, since all tasks of plant operation are carried out on the basis of the IBFS. These are optimal prerequisites to obtain from the IBFS the necessary data and information for the PSA-relevant components. (orig.)