Cel Among natural analogue objectives. the Oklo site. in Gabon. represents a unique geological environment whcre nuclear reaction products have been naturally introduced and can still be detected in fossil reaction zones. Previous studies have shown good chemical analogies of reaction zone materials to a spent fucl repository. Although the site geology is different from that of a deep repository, Oklo is an ideal location to test predictions relating to rates of movement of various radionuclides. including fission products. However, as for most natural analogue projects. the Oklo data actually used for Performance Assessment only represent a small part of the project's scientific results. More results could be transferred to PA provided uncertainties in the geological evolution of the Oklo environment are solved. The Oklo-Natural Analogue Phase II project will thus focus on a quantitative assessment of processes Or radionuclide migration/retention within the Oklo basin. Several main questions need to be addressed at Oklo. regardless of which part of the repositor system is under investigation to eventually provide suitable data t'or performance assessement model: Which fission products and end-products are still present '? Where have they been retained and in which form'? What are the confinement mechanisms and for how long have they been active'? What were the effects of geological or geochemical disturbances on the confinement'.' What is the transport mechanism and for how long has it been active'? The Oklo-Natural Analogue Phase II project is planned as a large scale multiobjective project which has to rulfill several research requirements: to build conceptual models of processes related to radionuclide migration/retention of importance to the evaluation of the performance of disposal systems: processes regarding the repository material (item C.3.7. 1 of thc EU work programme) and processes regarding the radionuclide groundwater transport (item C.3.7.2 of the EU work programme): to test these models against data from a well characterized natural system on a relevant framwork of space and time, to improve the knowledge on the confinement capacity and mechanisms of natural material; to improve data bases to be used in justifying performance assessment results and to identify specific slow transport processes during characteristic time scales of thousands of years. Based on repository performance assessment criteria. the Oklo system will be subdivided into: -The near-field (source term) which includes the reactor zone and the altered clay halo surrounding it. The rclcvant processes to be studied are fuel dissolution, element solubility. the behaviour of radionuclides at redox Ironts the e.xtent and effects of radiolysis and the diffusion of radionuclides throug clay and solid graphitic carbonaceous matter. -The far-field (geosphere) which includes the geological. hydrological and hydrochemical environment around the near-field. The relevant processes to be studied in understanding radionuclide mobility and retardation are advective and dispersive transport. fracture flow. matrix diffusion, flow channeling, complexation, sorption dissolution and precipitation. Also total system behaviour. including heterogeneity effects. can be studied to unterstand flow and transport of fission products. One of the central objectives in the project is the involvement of performance assessment specialists in addition to field and laboratory scientific groups, in transferring the experimental scientific work into suitable data for PA modelling. Program(-y) EAEC-NFS 2 - Specific research and training programme in the field of nuclear safety and safeguards, 1994-1998 Temat(-y) 030307 - Natural analogue/system studies Zaproszenie do składania wniosków Data not available System finansowania CSC - Cost-sharing contracts Koordynator Commissariat à l'Energie Atomique Wkład UE Brak danych Adres Ctr Etudes de Cadarache - CE-CA 13108 Saint-Paul-lez-Durance Francja Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (12) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko ASSOCIATION POUR LA RECHERCHE ET LE DEVELOPPEMENT DES METHODES ET PROCESSUS INDUSTRIELS Francja Wkład UE Brak danych Adres 35,Rue Saint-Honore 35, CNRS UMR 7619 77305 FONTAINEBLEAU Zobacz na mapie Koszt całkowity Brak danych Agence Nationale pour la Gestion des Déchets Radioactifs Francja Wkład UE Brak danych Adres 1-7,Rue Jean Monnet 1-7 92298 Chantenay-Malabry Zobacz na mapie Koszt całkowity Brak danych CONTERRA AB Szwecja Wkład UE Brak danych Adres Fridhemsgatan 66 B 11246 STOCKHOLM Zobacz na mapie Koszt całkowity Brak danych Centre National de la Recherche Scientifique Francja Wkład UE Brak danych Adres 1 rue Blessig 67084 Strasbourg Zobacz na mapie Koszt całkowity Brak danych Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Hiszpania Wkład UE Brak danych Adres 22,Avenida Complutense 22 28040 Madrid Zobacz na mapie Koszt całkowity Brak danych EMPRESA NACIONAL DE RESIDUOS RADIOACTIVOS S.A. Hiszpania Wkład UE Brak danych Adres 7,Emilio Vargas 7 28043 MADRID Zobacz na mapie Koszt całkowity Brak danych Etudes - Recherches - Matériaux Francja Wkład UE Brak danych Adres Place de L'Eglise 86320 Civaux Zobacz na mapie Koszt całkowity Brak danych QUANTISCI S.L. Hiszpania Wkład UE Brak danych Adres Parc Tecnologico del Valles, Av. Universitat Autonoma de Barcelona 3 08290 CERDANYOLA DEL VALLES Zobacz na mapie Koszt całkowity Brak danych SVENSK KAERNBRAENSLEHANTERING AB Szwecja Wkład UE Brak danych Adres Brahegatan 47 5864 STOCKHOLM Zobacz na mapie Linki Strona internetowa Opens in new window Koszt całkowity Brak danych UNIVERSITAT POLITECNICA DE CATALUNYA Hiszpania Wkład UE Brak danych Adres S/N,Jordi Girona 1-3, Modul D2, Campus Nord 08034 BARCELONA Zobacz na mapie Koszt całkowity Brak danych UNIVERSITY OF AARHUS Dania Wkład UE Brak danych Adres C.F. Moellers Allee 120 8000 AARHUS C Zobacz na mapie Koszt całkowity Brak danych Universidad de Oviedo Hiszpania Wkład UE Brak danych Adres S/N,C/ Jesús Arias de Valasco 33005 Oviedo Zobacz na mapie Koszt całkowity Brak danych
