Cel The project aims to improve the scientific basis for the assessment of performance and safety in waste management. It will provide fundamental knowledge about the behaviour of actinides and fission products in natural aquatic systems.The project focuses on key areas where further research is essential, including:i) understanding of the mechanisms that govern the interaction of actinides and fission products in natural aquatic systems;ii) closing existing gaps in the available thermodynamic database; andiii) reducing uncertainities in currently used constants. Investigations focus on the thermodynamics of aquatic actinide ions, particularly in the tetravalent oxidation state, on the interaction of actinides and fission products at the solid/aqueous solution interface and on the thermodynamics of secondary solid phases. A link will established to theoretical methods for prediction of chemical behaviour in actinide systems.A notable breakthrough has been achieved filling serious gaps in the database for tetravalent actinides, necessary e.g. to predict the geochemical of plutonium. The understanding of actinide complexation with small organic ligands, which may serve as model compound for natural organic matter, has been substantially increased using various spectroscopic methods and theoretical approaches. Computational methods (molecular modelling) have been applied for the first time to chemical problems related to nuclear waste disposal.An improved understanding of actinides interaction at the mineral/groundwater interface and sound sorption data have been provided. Mechanistic insight into the sorption of U(VI) on iron oxides including surface enhanced redox reactions has been achieved as well as the elucidation of the speciation of trivalent actinides sorbed onto alumina and clay minerals. Sorption reaction at single crystals have been studied by grazing incidence X-ray absorption spectroscopy and laser fluorescence spectroscopy. For the prediction of the U(VI) sorption onto rock minerals, a 'composite' model has been parameterised successfully using sorption data derived for the mineralogical rock constituents.The combination of wet chemical methods, surface analysis and spectroscopic techniques available in the different laboratories of the project partners helped in improve the basic understanding of solid solution formation of actinides in calcite, cement degradation secondary phases and phosphates. Such mineralisation processes are believed to be of cardinal importance for the actinide reactions in the near and the far field of a nuclear waste repository. The results gained in the ACTAF project indicate that inclusion in secondary phases can lead to a strong actinide retention in the repository or the surrounding geosphere. Dziedzina nauki engineering and technologyother engineering and technologiesnuclear engineeringnuclear waste managementnatural sciencesphysical sciencesnuclear physicsnuclear fissionnatural sciencesphysical sciencesthermodynamicsnatural sciencesphysical sciencesopticsspectroscopyemission spectroscopynatural sciencesphysical sciencesopticsspectroscopyabsorption spectroscopy Program(-y) FP5-EAECTP C - Research and training programme (Euratom) in the field of nuclear energy (1998 to 2002) Temat(-y) 2.1.2.-2.1.5 - Long-term behaviour of repository systems Zaproszenie do składania wniosków Data not available System finansowania CSC - Cost-sharing contracts Koordynator FORSCHUNGSZENTRUM KARLSRUHE GMBH - TECHNIK UND UMWELT Wkład UE Brak danych Adres Herrmann-von-Helmholtz-Platz 1 76344 EGGENSTEIN-LEOPOLDSHAFEN Niemcy Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (7) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko CENTRO DE INVESTIGACIONES ENERGETICAS, MEDIAMBIENTALES Y TECNOLOGICAS Hiszpania Wkład UE Brak danych Adres 22,Avenida Complutense 22 28040 MADRID Zobacz na mapie Koszt całkowity Brak danych ENTERPRIS LIMITED Zjednoczone Królestwo Wkład UE Brak danych Adres Pris, University of Reading, Whiteknights RG6 6AB READING / SILCHESTER Zobacz na mapie Koszt całkowity Brak danych PAUL SCHERRER INSTITUT Szwajcaria Wkład UE Brak danych Adres 5232 VILLIGEN Zobacz na mapie Koszt całkowity Brak danych RESEARCH CENTER ROSSENDORF Niemcy Wkład UE Brak danych Adres Bautzener Strasse 128 01314 WEISSIG - DRESDEN Zobacz na mapie Koszt całkowity Brak danych ROYAL INSTITUTE OF TECHNOLOGY Szwecja Wkład UE Brak danych Adres Teknikringen 30 100 44 STOCKHOLM Zobacz na mapie Koszt całkowity Brak danych UNIVERSITAT POLITECNICA DE CATALUNYA Hiszpania Wkład UE Brak danych Adres P.I. Els Dolors - Palau Firal 08240 MANRESA Zobacz na mapie Koszt całkowity Brak danych UNIVERSITY OF COPENHAGEN Dania Wkład UE Brak danych Adres Oester Voldgade 10 1350 KOEBENHAVN K/COPENHAEGEN Zobacz na mapie Koszt całkowity Brak danych