Title: European Clearinghouse - Incidents Related to Reactivity Management - Contributing Factors, Failure Modes and Corrective Actions
Citation: ATW-INTERNATIONAL JOURNAL FOR NUCLEAR POWER vol. 54 no. 10 p. 602-609
Publication Year: 2009
JRC N°: JRC54421
ISSN: 1431-5254
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC54421
Type: Articles in periodicals and books
Abstract: This work is part of the European Clearinghouse on Nuclear Power Plant Operational Experience Feedback (NPP-OEF) activity carried out at the Joint Research Centre/Institute for Energy (JRC/IE) with the participation of nine EU Regulatory Authorities. It investigates the 1999 Shika-1 criticality event together with other shortcomings in reactivity management reported to the IAEA Incident Reporting System in the period 1981-2008. The aim of the work was to identify reactivity control failure modes, reactor status and corrective actions. Initiating factors and associated root causes were also analysed. Five of the seven factors identified for all events were present in the 1999 Shika-1 event where criticality has been unexpectedly reached and maintained during fifteen minutes. Most of the events resulted in changes in procedures, material or staff and management training. The analysis carried out put in evidence that in several instances appropriate communication based on operational experience feedback would have prevented incident to occur. This paper also summarises the action taken at power plants and by the regulatory bodies in different countries to avoid repetition of similar events. It identifies insights that might be useful to reduce the likelihood of operational events caused by shortcomings in reactivity management.
JRC Directorate:Energy, Transport and Climate

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