Title: Events Related to Maintenance at Nuclear Power Plants: Summary Report of a European Clearinghouse Topical Study
Publisher: Publications Office of the European Union
Publication Year: 2016
JRC N°: JRC100651
ISBN: 978-92-79-56958-6 (print)
978-92-79-56959-3 (PDF)
ISSN: 1018-5593 (print)
1831-9424 (online)
Other Identifiers: EUR 27771
OP LD-NA-27-771-EN-C (print)
OP LD-NA-27771-EN-N (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC100651
DOI: 10.2790/8021
Type: EUR - Scientific and Technical Research Reports
Abstract: This report presents the essential results of a study performed by the European Clearinghouse on Operational Experience Feedback, in cooperation with IRSN and GRS, aiming to analyse the impact of inappropriate maintenance at NPPs. The databases of IRSN, GRS, U.S. NRC and IAEA IRS were screened to select relevant events related to maintenance that took place in the period 2002-2013. The examination of the selected events resulted in their classification into nine categories with families and, if necessary, sub-families. In total 921 events were analysed. The statistical analysis shows that there are no significant differences between the events occurred in nuclear power plants of different design. One of the event classifications performed was according to the type of maintenance (periodic, predictive, planned and corrective). The statistical analysis indicated that 47% of the events reported were related to periodic maintenance. The main affected components were "valves" (with 33% of the events), followed by "electric power components" (23%). The main root causes observed are "maintenance performed incorrectly" (27%), "deficiencies in written procedures or documents"(19%) and "deficiencies in management or organization" (17%). Regarding the impact on safety, the dominant family is "potential effects on safety function" (57%), followed by "significant effect on operation" (20%). Based on a detailed analysis of selected events, recommendations were developed and some of them are presented in this summary report. This study highlights that the continuous analysis of maintenance related events and the efficient utilization of operational experience provide important insights for improving the quality of maintenance and for preventing the occurrence of unusual events and thus helps to enhance nuclear safety.
JRC Directorate:Energy, Transport and Climate

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