Title: International Network on Incorporation of Ageing Effects into PSA
Authors: PATRIK Milan
Other Contributors: KIRCHSTEIGER Christian
Citation: Proceedings of the International Topical Meeting on Probabilistic Safety Analysis (PSA 05)
Publisher: American Nuclear Society
Publication Year: 2005
JRC N°: JRC31168
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC31168
Type: Articles in periodicals and books
Abstract: This paper describes the background and status of a new International Network on "Incorporating Ageing Effects into Probabilistic Safety Assessment". The Joint Research Centre (JRC) of the European Commission organized in September 2004 the kickoff meeting of this Network at JRC's Institute for Energy in Petten, Netherlands, with the aims to open the Network, to start discussion of ageing issues in relation to incorporating ageing effects into PSA tools and to come to consensus on objectives and work packages of the Network, taking into account the specific expectations of potential Network partners. Representatives of 20 institutions from Europe and the USA actively attended at this meeting (regulators, utilities, technical support organizations, research, academia, consultants). A questionnaire, which was sent to all potential partners before the meeting, focused on partners’ current and past activities and experience in use of PSA applications, ageing studies and incorporation of ageing effects into PSA methods and tools. The results were presented and discussed at the meeting, resulting in conclusions on the network's work program to be followed. The presentations and discussions at the meeting confirmed the main conclusion from the previously organized PSAM 7 pre-conference workshop on “Incorporating PSA into Ageing Management”, Budapest, June 2004, namely that incorporating ageing effects into PSA seems to be more and more a hot topic particularly for risk assessment and ageing management of nuclear power plants operating at advanced age (more than 25-30 years) and for the purpose of plant life extension. However, it also appeared that, especially regarding the situation in Europe, at present there are several on-going feasibility or full studies in this area, but not yet a completed Ageing PSA leading to applications. Participants agreed that the Network activity will start with performing a survey and documenting available methods and approaches for incorporating ageing effects into PSA (state-of-the-art report) and with discussing the potential use of Ageing PSA applications. The work on this state-of-the-art report started in December 2004 and is expected to be finalized in a first version by June 2005. An important task of the network will also be case studies and benchmark exercises. Preliminary topics for case studies were discussed at the kickoff meeting. From the discussions at and after the meeting, two major topics for case studies have been identified for which practical case studies will be developed: "Reliability Data", dealing with identification of databases in the area, development of a procedure how to elaborate reliability data for Ageing PSA related purposes, and testing of this procedure by means of plant-specific data collection and analyses, resulting in estimation of ageing related reliability parameter distributions. Main objective is to enable assessment of the cost/benefit related to such efforts in full plant-specific applications. "Ageing FMEA": For selected component type(s), ageing degradation mechanisms will systematically be identified, resulting in a recommended practice to be used for further reliability data collection and systems analysis for Ageing PSA. The paper in hand will give an overview of the progress achieved within the Network.
JRC Directorate:Energy, Transport and Climate

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