ASN Report 2017

357 ASN report on the state of nuclear safety and radiation protection in France in 2017 Chapter 12  - EDF Nuclear Power Plants Prevention of the health impacts caused by the growth of legionella and amoeba in certain cooling systems of the NPP secondary systems Some cooling systems in NPPs are environments that are favourable to the development of legionella and other amoebas (see point 1.4). ASN resolution 2016-DC-0578 of 6th December 2016 on the prevention of risks resulting from the dispersal of pathogenic micro-organisms (legionella and amoeba) by PWR secondary system cooling facilities sets requirements concerning: ཛྷ ཛྷ the design, upkeep and monitoring of the facility; ཛྷ ཛྷ the maximum legionella concentrations in the water in the facility and downstream of it with regard to amoeba; ཛྷ ཛྷ the steps to be taken in the event of proliferation of micro­ organisms in the systems or identified infection in the vicinity of the facility; ཛྷ ཛྷ information of the public and the administrations in the event of proliferation of micro-organisms. Through its investigations and its field checks, ASN closely monitors the preventive or remedial measures taken by EDF to reduce the risk of the proliferation of these micro-organisms and the results of these actions, including the chemical discharges resulting from biocidal treatment. 2.5.3 Evaluation of control of detrimental effects and impact on the environment Evaluation of prevention of detrimental effects, control of environmental discharges and waste management In 2017, ASN carried out 46 inspections on the control of detrimental effects and the impact of the NPPs on the environment, representing a total of about fifty days. These inspections primarily concerned the prevention of detrimental effects, the control of environmental discharges and waste management. The Bugey, Saint-Alban/Saint-Maurice and Tricastin NPPs underwent a reinforced inspection. ASN considers that EDF’s organisation for the detrimental effects and impact control of NPPs on the environment is satisfactory on most sites. As the first provisions of ASN resolution 2016-DC-0578 of 6th December 2016 had entered into force in April  2017, ASN has already inspected the Golfech and Cruas-Meysse NPPs and will continue its inspections in 2018. On the basis of these inspections, ASN observes that the steps taken by the sites to prevent the risks of the dispersal of pathogenic micro-organisms by the cooling installations of the PWR secondary systemmust be reinforced. Operational management of radioactive and conventional waste in the NPPs could on the whole be improved, in particular during reactor maintenance outage periods. However, ASN is pleased to see the steps taken by EDF to determine new waste processing methods or new disposal routes. GRAPH 3: Liquid radioactive discharges for the NPPs in 2017 (per pair of reactors) Blayais/2 Bugey/2 Chinon/2 Cruas-Meysse/2 Dampierre-en-Burly/2 Fessenheim Gravelines/3 Saint-Laurent-des-Eaux Tricastin/2 Belleville-sur-Loire Cattenom/2 Flamanville Golfech Nogent-sur-Seine Paluel/2 Penly St-Alban / St-Maurice Chooz Civaux 0 10 20 30 40 50 60 70 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Non-Tritium (GBq) Tritium (TBq) Activity discharged (TBq) Activity discharged (GBq) As there can be a different number of reactors on each site, the results are given “per pair of reactors”, to enable a comparison to be made from one site to another. This for example entails: • keeping the results as-are for the Golfech site, which has two reactors; • dividing by two those of Chinon, which has four reactors (Chinon/2); • dividing by three those of Gravelines, which has six reactors (Gravelines/3). In addition, the discharge data transmitted by EDF to ASN for each site are not representative of the operating time of the installations or of the activities performed on the sites.