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|Title:||Maintenance Issues in Relation to Plant Life Management Models|
|Authors:||CONTRI PAOLO; BIETH MICHEL|
|Type:||Articles in periodicals and books|
|Abstract:||Due to current social and economical framework, in last years many nuclear power plant owners started a program for the Long Term Operation (LTO)/PLIM (Plant Life Management) of their older nuclear facilities. PLIM/PLEX has already been implemented in many countries (USA, Russia, etc.). This process has many nuclear safety implications, other than strategic and political ones. The need for tailoring the available safety assessment tools to such applications has become urgent in recent years and triggered many research actions. In particular, a PLIM framework requires both a detailed review of the features of the main safety programs (Maintenance, ISI, Surveillance) and a complete integration of these programs into the general management system of the plant. New external factors, such as: large use of subcontractors, need for efficient management of spare parts, request for heavy plant refurbishment programs demand for updated techniques in the overall management of the plant. Therefore new organisational models have to be developed to appropriately support the PLIM framework, integrating both safety related and non safety related issues. Last year a network of European Organisations operating Nuclear Power Plants, SENUF (Safety of European Nuclear Facilities), under the coordination of the JRC-IE (European Commission, Joint Research Center, Institute for Energy), carried out an extensive questionnaire on maintenance practice in their facilities aiming at capturing the aspects of the maintenance programs where research is mostly needed. This paper uses some results of the questionnaire, which was not oriented to LTO/PLIM, to draw some conclusions on how the current maintenance programs could support a potential LTO/PLIM, among the other programs running at NPPs. In this sense, it is spin-off of the SENUF WG on maintenance. The paper aims at identifying the technical attributes of the maintenance programs more directly affecting the decision for a long-term safe operation of a nuclear facility, the issues related to their implementation and safety review. The paper includes an analysis of the questionnaire circulated among the SENUF participants and a discussion on the implications of optimised maintenance programs in existing plants. Some examples at VVER plants taken by sources other than SENUF complete the overview, with some proposals for solution of practical implementation problems.|
|JRC Institute:||Institute for Energy and Transport|
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