engleski

Preliminary waste acceptance criteria for LILW repository in Slovenia

The national radioactive waste management agency in Slovenia (ARAO) is under site confirmation and facility design preparation for LILW disposal. Therefore the development of the radioactive waste acceptance criteria for disposal started recently. The project scope includes review and analysis a number of references focusing in particular on those waste characteristics i.e. related parameters and their limitations that may affect the repository long-term safety. The waste acceptance criteria for disposal cannot be clearly defined if the site selection process and repository design are in an early stage. In such case a request is made that the waste acceptance criteria should be anticipated. Such request is logical since the costs of total radioactive waste management should be optimized. Namely, predisposal radioactive waste management capacity should be established so as to meet all the requested acceptance criteria (storage, transport and disposal). Any omissions during the predisposal treatment stage shall have to be made up by additional treatment, which will certainly increase the total radioactive waste management costs. Development of the radioactive waste acceptance criteria for disposal in Slovenia has been carried out under the following main conditions: (1) Site selection process is under way (a shortlisted site is Vrbina, Krško) ; (2) Repository design is in an early stage (underground silos) ; (3) Total volume of short lived waste expected by 2037 is assessed to be 17, 200 m3 (assessment includes operational and decommissioning waste from Krško NPP, decommissioning waste from TRIGA, and radioactive waste from medicine, research and industry) ; (5) Qualitative characterization of the operational waste that is storing at Krško NPP and waste acceptance criteria for this storage has been performed ; and (6) Characterization of the radioactive waste from other sources that is storing at Brinje Central Interim Storage Facility, as well as corresponding waste acceptance criteria has been established. Because so many uncertainties the radioactive waste acceptance criteria for disposal could only be anticipated presently. The anticipation is based on a simplified scheme according to which the radioactive waste stored so far at Krsko and Brinje storage facilities, as well as the waste which will be generated in the meantime (short-lived decommissioning waste inclusive), shall be additionally treated prior to the disposal, applying the waste acceptance criteria to a maximum possible extend. The waste shall be conditioned in 200-, 320- and 860-liter metal containers. The radioactive waste packages stabilized in this way shall be placed in concrete containers, which shall meet the request for 300-years durability. The concrete containers for waste disposal shall be adequately disposed in underground silos. Anticipated waste acceptance criteria for disposal elaborated in the paper are derived from the practice implemented in some European repositories (El-Cabril, Drigg, Dukovany, Mochovce, Konrad, Forsmark and Olkiluoto), and on the basis of already established acceptance criteria for Brinje and Krško storage facilities. Formulations from the Slovenian legislation such as the Regulation JV7, Decree UV2 and others, and relevant recommendations given by the IAEA are used to a great degree. For elaboration and defining of some criteria, formulations from the 10 CFR Part 61 regulations are used as well. However, the proposed waste acceptance criteria are uncertain to a large extent, particularly with regard to the quantitative aspects that sets up limits for particular parameters. Therefore, the proposal contains a list of further activities that need to be taken in order to reduce present ambiguities.

waste acceptance criteria, radiological properties, chemical properties, physical properties, mechanical properties, thermal properties, biological properties

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