Abstracts ASN Report 2019

Áǝƺ ȸƺȇȇǣǼǣɀ ȇɖƬǼƺƏȸ ȵȒɯƺȸ ȵǼƏȇɎ The Brennilis NPP is situated in the Finistère département , on the Monts d’Arrée site 55 km north of Quimper. Baptised 0n (ٮג ً Ɏǝǣɀ ǣȇɀɎƏǼǼƏɎǣȒȇ ٢ zX ژ ׏ אה ٣ ɯƏɀ Əȇ ǣȇƳɖɀɎȸǣƏǼ ƺǼƺƬɎȸǣƬǣɎɵ production prototype (70 MWe) moderated with heavy water and cooled with carbon dioxide, and it was definitively shut down in 1985. The Decree of 27 July 2011 authorized the decommissioning operations with the exception of those concerning the reactor block. The Decree of 16 November 2016 extended the time frame for the decommissioning operations, particularly those concerning: • decommissioning of the heat exchangers; • the clean-out and demolition of the effluent treatment station. In July 2018, EDF submitted an application file for the complete decommissioning of its installation. This file, which should enable decommissioning of the reactor block to be prescribed by decree, is currently being examined. During 2019, EDF continued the preliminary work (preparation of access points and erection of scaffolding) and the safeguarding and removal of asbestos from the reactor containment in preparation for taking samples in the reactor block. These sampling operations were authorised by ASN by resolution CODEP-DRC-2019-039420 of 20 September 2019. EDF also carried out preparatory tests in 2019 so that these sampling operations could be carried out at the beginning of 2020. With regard to the decommissioning of the Effluent Treatment Station (STE), the basemat demolition operations that began in August 2016 took longer than expected and were completed in early 2018. The licensee then proceeded with the removal of the contaminated soils subjacent to the STE after approval of its soils management plan by ASN in April 2018. ASN conducted checks in the presence of all the parties after removal of the soils, the results of which will be known in 2020. Furthermore, following the detection of a contaminated water leak in a room situated within the reactor containment in March 2017, EDF conducted investigations in 2019 to identify the origin of the leak and prepared the complementary investigations to be carried out prior to the reactor block decommissioning work. ASN considers that the licensee conducts its work in compliance with the safety and radiation protection requirements, but must improve its management of the time taken to perform the authorised operations. In 2020, ASN will continue its examination of the complete decommissioning file and of the concluding report on the Brennilis installation periodic safety review submitted at the end of 2019. ¨ȒǼǼɖɎƺƳ ɀǣɎƺɀ ƏȇƳ ɀȒǣǼɀ ƏȇƳ ȅǣȇǣȇǕ ɀǣɎƺɀ ASN backs up the Regional directorates for the environment, planning and housing (Dreal) on polluted sites and soils and on mining sites. With regard to the places in the public domain where uranium-bearingmining waste rock was reused, the ten areas in Bretagne concerned by the priority works have been treated (partial or complete removal of the mining waste rock). The materials have been transferred to the former mining site of Prat-Mérien (Morbihan département ). Five areas containing sludge and sediments radiologically contaminated by mine water from the former uraniummines have also been treated. The materials have been removed and transported to the Écarpière site (Loire-Atlantique département ) for disposal. ASN Report on the state of nuclear safety and radiation protection in France in 2019 45 REGIONAL OVERVIEWOF NUCLEAR SAFETY AND RADIATION PROTECTION BRETAGNE