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|Title:||Proceedings of International Workshop on Practical Applications of Age-Dependent Reliability Models and Analysis of Operational Data, 5-6 October 2005, Fontenay aux Roses, France, organised by Institut de Radioprotection et de Surete Nucleaire (IRSN), France, and European Commission - DG JRC - Institute for Energy, Petten, Netherlands|
|Publisher:||Institut de Radioprotection et de Surete Nucleaire (IRSN)|
|JRC Publication N°:||JRC30949|
|Other Identifiers:||EUR 21862 EN|
|Abstract:||Ageing could be defined as a general process in which characteristics of components, systems and structures ("equipment"), gradually change with time. The ageing could cause a degradation of safety margins imposed by plant design or regulatory requirements. It could lead to a component failure or even multiple common cause failures of redundant components under abnormal operating conditions or accidents. The potential for failures and problems resulting from ageing may even increase in the future as more and more nuclear power plants (NPPs) approach the final periods of their nominal design lifetime. Therefore, equipment ageing has become one of the most important aspects in Nuclear Power Plant periodical safety re-assessments (French approach) or License Extension Programs (US approach). To be effective in ageing management means looking at the right spots with the right techniques. One of the effective tools, which could be used for that purpose and which complements the deterministic approach and supports the traditional defense in depth philosophy is Probabilistic Safety Assessment (PSA). PSA is increasingly being used as integral part of the safety related decision-making process. The methodology has matured over the past decade and PSA is nowadays seen as an effective and essential tool to complement the traditionally performed deterministic analyses. The current standard PSA tools do not adequately address important ageing issues, such as for the component and system reliability models used. Reliability models are usually based on the assumption of a constant component failure rate. In case of premature equipment ageing, inappropriate maintenance or expiration of specified lifetime this assumption is not valid anymore. Consequently, time dependent failure rate models have to be developed and applied. Ageing contributors could include active and passive components, which are susceptible to ageing and the ageing mechanisms and stressors that can cause component ageing. In this context, the purpose of the workshop was to present and to exchange on an international level the experience of practical application of time-dependent reliability models. The program of the workshop contents fore sessions : Aging management and Aging PSA, Modelling, Operating experience, Accelerated aging tests.|
|JRC Institute:||Institute for Energy and Transport|
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