ASN also recommends setting time milestones for Andra’s next design stages (preliminary design study and then Safety Options Dossier – DOS), for a near-surface disposal project for LLW-LL waste in the Vendeuvre-Soulaines municipality federation, which will be incorporated into this general strategy. ASN considers that the legacy RTCU waste, as a conservative measure, and the RTCU waste produced as from 1 January 2019 must, in application of Article 63 of the Order of 23 February 2017, be registered in the LLW-LL category and be better integrated in the current work on the LLW-LL waste management scenarios. ASN recommends that the studies of a near-surface RTCU waste disposal facility, under reworked cover (either in the pit of the former open-cast mine, or in a new pit yet to be built), be continued, involving the representatives of the localities actually or liable to be concerned. The 5th edition of the PNGMDR is intended, during its implementation, to clarify the possible management scenarios for all LLW-LL waste and to analyse them applying several criteria in order to stabilise an overall management strategy. The main question is to define the scope of the waste that could be emplaced in the facility planned to be set up on the site of the municipal federation of Vendeuvre‑Soulaines and to identify the additional needs for disposal sites, sites whose locations shall be sought under regulated conditions. 1.3.4 High-level and intermediate-level, long-lived waste Following on from the Act of 30 December 1991, the Act of 28 June 2006 provides for the research into the management of HLW and ILW-LL radioactive waste to be continued along three complementary lines: separation and transmutation of the long-lived radionuclides, interim storage and reversible deep geological disposal. Separation/transmutation The report of the Special Public Debates Commission of 25 November 2019 concerning the public debate prior to the 5th edition of the PNGMDR concludes in particular that “there are two options, each one defended by a portion of the actors: deep geological disposal and interim sub-surface storage for a sufficient length of time to allow progress to be made in transmutation research in order to reduce the radioactivity of the waste.” Separation/transmutation processes aim to isolate and then transform the long-lived radionuclides in radioactive waste into shorter-lived radionuclides or even stable elements. The transmutation of the minor actinides contained in the waste would have an impact on the size of the disposal facility, by reducing both the heating power, the harmfulness of the packages placed in it and the repository inventory. Despite this however, the impact of the disposal facility on the biosphere, which originates essentially from the mobility of the radionuclides contained in the fission and activation products, would not be significantly reduced. In its opinion 2020-AV-0369 of 1 December 2020, ASN points out that the prospects of industrial-scale transmutation of the already packaged waste of the Cigéo reference inventory are not credible. It considers that, although transmutation studies should be continued, they should concern radioactive substances currently qualified as materials or the waste produced by a future fleet of reactors and that they should be carried out with a view to developing complete solutions, including the disposal of the waste resulting from transmutation and offering a high level of safety. Storage The second line of research and studies in the Act of 28 June 2006 concerns the storage of waste. The long-term storage of high-level long-lived waste (HLW-LL), which was one of the lines of research provided for in the Act of 30 December 1991, has not been retained as a definitive management solution for this type of radioactive waste. Storage facilities are nevertheless indispensable pending commissioning of the deep geological disposal facility, to allow the cooling of certain types of waste and then to accompany the industrial operation of the disposal facility, which will develop in stages. Furthermore, if operations to remove emplaced packages were to be decided on in the context of the reversibility of the repository, storage facilities would be needed. Reception of the first radioactive waste packages for deep geological disposal is now planned for around 2040. The Act of 28 June 2006 tasked Andra with coordinating the research and studies on the storage of HL and ILW-LL waste, which are therefore part of the approach of complementarity with the reversible repository. This law stipulated more specifically that the research and studies on storage should, by 2015 at the latest, allow new storage facilities to be created or existing facilities to be modified to meet the needs identified by the PNGMDR, particularly in terms of capacity and duration. Progress in storage In 2013, Andra submitted a report on the research and studies carried out. This report more particularly presented the established inventory of future storage needs, the exploration of the complementarity between storage and disposal, studies and research on engineering and on the phenomenological behaviour of the warehouses and a review of innovative technical options. From 2013 to 2015, Andra furthered the study into storage concepts linked to repository reversibility. This concerns facilities which, if necessary, would accept packages removed from the repository. For such facilities, Andra looked for versatility which would allow simultaneous or successive storage of packages of various types in their primary form or placed in disposal overpacks. In the study it submitted in 2013, Andra stated that it had stopped its research into near-surface storage facilities. It justified abandoning this operation in particular because of the greater complexity of this type of facility (consideration of the presence of underground water and the need for ventilation if exothermal waste was emplaced, surveillance of the civil engineering structures) and the lower operating flexibility. The multi-criteria analysis submitted in 2018 did not call into question these conclusions. In the light of industrial experience, research and its studies, Andra issued recommendations in 2014 for the design of future storage facilities that are complementary to disposal. They concern more specifically the service life of the facilities (up to about a hundred years), their monitoring and surveillance and their modularity. Orano has integrated some of the recommendations in the design of the extension of the glass storage facilities at La Hague (E/EV-LH)) intended for high-level waste and situated in BNI 116. This extension comprises two pits: 30 and 40, commissioned in 2015 and 2017 respectively. Within the framework of the PNGMDR 2013-2015, and after presenting the inventory of HLW and ILW-LL waste packages intended for Cigéo as at the end of 2013 and the status of the existing storage locations, the producers more specifically analysed the fundamental elements enabling waste package storage needs to be identified. ASN Report on the state of nuclear safety and radiation protection in France in 2022 365 • 14 • Radioactive waste and contaminated sites and soils 14 01 07 08 13 AP 04 10 06 12 03 09 05 11 02
RkJQdWJsaXNoZXIy NjQ0NzU=