Skip to main content
Vai all'homepage della Commissione europea (si apre in una nuova finestra)
italiano italiano
CORDIS - Risultati della ricerca dell’UE
CORDIS
Contenuto archiviato il 2024-05-24

Aquatic chemistry and thermodynamics of actinides and fission products relevant to nuclear waste disposal

Obiettivo

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; and
iii) 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.

Campo scientifico (EuroSciVoc)

CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP. Cfr.: Il Vocabolario Scientifico Europeo.

È necessario effettuare l’accesso o registrarsi per utilizzare questa funzione

Programma(i)

Programmi di finanziamento pluriennali che definiscono le priorità dell’UE in materia di ricerca e innovazione.

Argomento(i)

Gli inviti a presentare proposte sono suddivisi per argomenti. Un argomento definisce un’area o un tema specifico per il quale i candidati possono presentare proposte. La descrizione di un argomento comprende il suo ambito specifico e l’impatto previsto del progetto finanziato.

Invito a presentare proposte

Procedura per invitare i candidati a presentare proposte di progetti, con l’obiettivo di ricevere finanziamenti dall’UE.

Dati non disponibili

Meccanismo di finanziamento

Meccanismo di finanziamento (o «Tipo di azione») all’interno di un programma con caratteristiche comuni. Specifica: l’ambito di ciò che viene finanziato; il tasso di rimborso; i criteri di valutazione specifici per qualificarsi per il finanziamento; l’uso di forme semplificate di costi come gli importi forfettari.

CSC - Cost-sharing contracts

Coordinatore

FORSCHUNGSZENTRUM KARLSRUHE GMBH - TECHNIK UND UMWELT
Contributo UE
Nessun dato
Indirizzo
Herrmann-von-Helmholtz-Platz 1
76344 EGGENSTEIN-LEOPOLDSHAFEN
Germania

Mostra sulla mappa

Costo totale

I costi totali sostenuti dall’organizzazione per partecipare al progetto, compresi i costi diretti e indiretti. Questo importo è un sottoinsieme del bilancio complessivo del progetto.

Nessun dato

Partecipanti (7)

Il mio fascicolo 0 0