Title: European Clearinghouse: Events related to Low Power and Shutdown: Summary Report of a European Clearinghouse Topical Study
Publisher: Publications Office of the European Union
Publication Year: 2016
JRC N°: JRC100426
ISBN: 978-92-79-55017-1 (print)
978-92-79-55016-4 (PDF)
ISSN: 1018-5593 (print)
1831-9424 (online)
Other Identifiers: EUR 27743
OP LD-NA-27743-EN-C (print)
OP LD-NA-27743-EN-N (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC100426
DOI: 10.2790/1897
Type: EUR - Scientific and Technical Research Reports
Abstract: This summary report presents the main results of an extensive review of operating experience related to shutdown operation. The work covers all kinds of commercial power reactors currently or recently in operation and all off-power modes of operation. The sources of operating experience for the study were the IRS database, the Licensee Event Reports (LERs) of the US NRC, the French operational experience database of IRSN and the German operational experience database of GRS. Thousands of event reports were screened to select those which are relevant for the objectives of the study. This resulted in a list of 643 event reports. It was found that the last phase of the refuelling outage, including the preparations for the return to power operation, the core physical tests and the start-up presents a significant rate of event reporting. Another quantitatively important family of events is the one formed by violations of the plant limit conditions for operation. Concerning the root cause, and not surprisingly, the human factor is behind the majority of events reported. The study raises many lessons learned and provides a total of 29 observations covering mainly outage schedule, team coordination, plant status monitoring, loss of coolant and decay heat removal, and maintenance. The observations made are expected to help the licensees and the regulatory authorities (1) to improve the way in which operations are conducted during shutdown states, (2) to guarantee the main safety functions during shutdown, and (3) to keep shutdown maintenance activities under control.
JRC Directorate:Energy, Transport and Climate

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