ASN Report 2018

• The operating experience feedback process In recent years, all the NPPs have implemented a formal organisation and dedicated tools to oversee and coordinate internal and external operating experience feedback. Despite this, ASN found shortcomings in 2018 with regard to the detection and characterisation of the difficulties and deviations reported in the field. The encouragement given to the contractors to transmit positive or negative findings via the dedicated database is only bearing fruit on a minority of sites. The contractor assessments are also proving to be sometimes incomplete, more specifically given the safety implications. Weaknesses have also been identified in the processing of operating experience feedback and the sharing of experience with the outside contractors. In addition, the assessments conducted by the sites following significant events are pertinent, but the analysis of the root causes often leads to corrective measures that are too basic and frequently nothing more than awareness-raising sessions for the staff, departments or companies identified as being responsible for the deviation. The analysis of the root causes should on the contrary be able to identify organisational shortcomings. Finally, too many sites are still particularly limited when it comes to assessing the effectiveness of the corrective measures. 2.7  ̶  Personnel radiation protection 2.7.1  –  Monitoring of personnel radiation protection Exposure to ionising radiation in a nuclear power reactor comes from activation of primary system corrosion products (mainly) and from fuel fission products. All types of radiation are present (neutrons, α , β and γ ) and the risk of exposure is both external and internal. In practice, more than 90% of the doses received come from external exposure to β and γ radiation. Exposure is primarily linked to maintenance operations during reactor outages. ASN checks compliance with the regulations relative to the protection of workers liable to be exposed to ionising radiation in NPPs. In this respect, ASN concerns itself with all workers active on the sites, whether EDF or contractor personnel. Mean collective dose per reactor (Man.Sv/reactor) 0.00 0.25 0.50 0.75 1.00 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 0.66 0.69 0.62 0.71 0.67 0.79 0.72 0.71 0.76 0.61 0.67 Source: EDF Graph 5 Number and percentage of workers per dose range (in mSv) for 2018 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 15 to 20 10 to 15 6 to 10 5 to 6 2 to 5 1 to 2 0.5 to 1 0.001 to 0.5 9.56% 8.81% 0.37% 0.00 2.89% 1.40% 9.11% 67.86% 4,171 3,846 160 0 1,262 613 3,973 29,609 Number of people Dose range (mSv) Source: EDF Graph 6 302  ASN report on the state of nuclear safety and radiation protection in France in 2018 10 – EDF NUCLEAR POWER PLANTS