Updated 2023-01-26
A number of Member countries of the Nuclear Energy Agency of the Organisation for Economic Co-operation and Development (hereafter called the “OECD/NEA”) decided to establish the International Common-Cause Failure Data Exchange Project (hereafter called the “ICDE Project” or the “Project”) under the auspices of the OECD NEA Committee on the Safety of Nuclear Installations (CSNI). In 1997, CSNI formally approved the carrying out of this Project, following which the Project was successfully operated over 8 consecutive terms from 1998 to 2022. The ninth consecutive term of the Project is running from 2023 and ending on December 31st, 2026.
The objectives of the ICDE Project are to: - collect and analyse Common-Cause Failure (CCF) events over the long term so as to better understand such events, their causes, and their prevention - generate qualitative insights into the root causes of CCF events which can then be used to derive approaches or mechanisms for their prevention or for mitigating their consequences to develop common coding format for coding national CCF data - establish a mechanism for the efficient feedback of experience gained in connection with CCF phenomena, including the development of defences against their occurrence, such as indicators for risk based inspections - generate quantitative insights and record event attributes to facilitate quantification of CCF frequencies in member countries; and - use the ICDE data to estimate CCF parameters Full list of objectives are expressed in the Terms and Conditions for participation in the OECD ICDE project.
The ICDE Project envisages including all possible dependent failure events of interest, including both complete and partial CCF events. The Project covers the key components of the main safety systems. The components listed below are included in the ICDE Project, and other items may be added to or deleted from this list upon the decision of the ICDE Project Management Board, e.g. by taking into account their importance in the probabilistic safety assessment (PSA): - Centrifugal pumps, (1999, updated 2013) - Diesel generators, (2000, updated 2018) - Motor operated valves, (2001, updated 2021) - Safety/relief valves, (2002, updated 2020) - Check valves, (2003) - Batteries, (2003, updated 2022) - Switchgear & breakers, (2008) - Reactor protection system components - level measurement, (2008) - control rod drive mechanisms, (2013) - Heat exchangers, (2015) - Fans (ongoing) - Main steam isolation valves, (ongoing) - Digital I&C, (ongoing) - Inverters, (ongoing) - Cross-component CCFs, (ongoing) By 2022 data collection, analysis and exchange have been performed for centrifugal pumps, diesel generators, motor-operated valves, safety relief valves, check valves, batteries, level measurement, control rod drive assemblies, breakers, heat exchangers, fans, main steam isolation valves and digital I&C. Final reports presenting the experience from the data collection have been developed and are presented on the public ICDE website. Initial exchange for Inverters and Cross-component CCFs (e.g. Asymmetrical faults) is planned. In addition topical analyses have been performed for: - External Environmental Factors (2015, 43 events, updated 2020 to 64 events) - Diesels all affected (2017, 143 events) - Plant Modifications (2019, 53 events) - Improving Testing (2019, 59 events) - Multi unit events, (2019, 87 multi-unit events) - Intersystem dependencies, (2020, 25 intersystem events) - Pre-initiator human failure ICDE events, (2022, 51 events) - Safety Culture Deficiencies in CCF events, (ongoing) - Quantification Guidance and Data Interpretation, (ongoing)
The ICDE project is operated under the umbrella of OECD/NEA/CSNI/WGOE. See further OECDE/NEA Home Page. Participation in the ICDE Project is open to the Government of any OECD NEA member country or to any national agency or public or private organisation proposed by such Government which indicates its agreement to the ICDE Terms and Conditions and which assumes the same rights and obligations as the other Participants in the Project. An entity wishing to participate in the ICDE Project may indicate its interest to the Management Board. Approval of such entity as a Signatory or Associate Member shall require the consent of all members. If approved, the entity concerned shall indicate its agreement to participate in the ICDE Project in accordance with the Terms and Conditions set out herein by written correspondence addressed to the Director-General of the OECD/NEA. New Participants shall be required to pay an entry fee as stipulated in Appendix C. The ICDE Participants (as of 2023) are the following organizations: - Canada - CNSC - Czech Republic - SÚJB - Finland - STUK - France - IRSN - Germany - GRS - Japan - NRA - Sweden - SSM - Switzerland - ENSI - United States - NRC In order to coordinate international work the ICDE Project has established an operating Agent (earlier called - Clearing House) which is responsible for the Project Documentation, coding format development, databank development, supervision of data collection by member countries, running data exchange and performing analysis of the collected data. The AFRY (formerly ES Konsult) has been the Operating Agent since the beginning of the Project activities.
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