2.4.7 Monitoring facilities compliance with the requirements Maintaining the conformity of the facilities with their design, construction and operating requirements is a major issue insofar as this conformity is essential for ensuring compliance with the safety case. The processes employed by the licensee, notably during reactor outages, contribute to maintaining the compliance of the facilities with the requirements resulting from this safety case. The identification and processing of deviations The checks initiated by EDF within the framework of its operating baseline requirements and the additional verifications requested by ASN, on the basis more particularly of OEF, can lead to the detection of deviations from the defined requirements, which must then be processed. These deviations can have a variety of origins: design problems, construction errors, insufficient expertise in maintenance work, deterioration through ageing, organisational shortcomings, etc. The steps taken to detect and correct deviations, specified in the Order of 7 February 2012, play an essential role in maintaining the level of safety of the facilities. “Real-time” checks Carrying out periodic test and preventive maintenance programmes on the equipment and systems contributes to identifying deviations. Routine visits in the field and technical inspection and verification of activities considered to be important for the protection of persons and the environment are also effective means of detecting deviations. GRAPH Trend in the number of significant events rated on the INES scale in the EDF Nuclear Power Plants between 2011 and 2021 1 0 200 400 600 800 1,000 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 935 936 747 830 817 765 697 717 835 875 934 INES Level 0 INES Level 1 INES Level 2 This Graph includes data from the Fessenheim NPP until 2020. GRAPH Trend in the number of significant events by domain in the EDF Nuclear Power Plants between 2011 and 2021 2 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 975 988 845 919 902 868 774 782 916 930 999 0 200 400 600 800 1,000 This Graph includes data from the Fessenheim NPP until 2020. ESS ESR ESE ASN Report on the state of nuclear safety and radiation protection in France in 2021 295 10 – THE EDF NUCLEAR POWER PLANTS 08 07 13 04 10 06 12 14 03 09 05 11 02 AP 01
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