Skip to main content
Aller à la page d’accueil de la Commission européenne (s’ouvre dans une nouvelle fenêtre)
français fr
CORDIS - Résultats de la recherche de l’UE
CORDIS
Contenu archivé le 2024-04-16

The Corrosion of Nuclear Waste Glasses in a Clay Environment: Mechanisms and Modelling

Objectif

The objective of the present project is to enlarge the already existing database on the performance of various simulated HLW-glasses in one of the reference repository environments, the Boom clay, with the aim to elucidate corrosion mechanisms in clay media and to propose a source term for the radionuclide release into the near field by the use of corrosion accelerating conditions (accelerated tests) and more complex media (integrated tests) and to model the long term interaction between glass and clay environment, which is the final goal of the project.
This programme studies the performance of various simulated high level radioactive waste (HLW) glasses in one of the reference repository environments, the Belgian Boom clay, with the aim to elucidate corrosion mechanisms in clay media and to propose a source term for the radionuclide release into the nearfield. The objective of the present project is to enlarge the already existing database by the use of corrosion accelerating conditions (accelerated tests) and more complex media (integrated tests) and to model the long term interaction between glass and clay environment, which is the final goal of the project. In the accelerated tests, surface area to solution volume and temperature are used as the corrosion accelerating parameters. To obtain a high surface area to solution volume the glass is powdered. In the integrated tests glass corrosion is studied in the presence of canister and overpack corrosion products and backfill.

All attention has been focussed on the starting up of the experiments. By the end of 1991 the inactive accelerated tests were partly started. The remaining accelerated tests, the inactive integrated tests and the tracered meltings were in preparation. The modelling effort will commence at a later stage.
Work programme:

Accelerated tests, inactive: powdered samples of glasses SON68 and SM539 are exposed to distilled water (DW), synthetic interstitial claywater (SIC) and a mixture of 500 g Boom clay and 25 g Fe2O3 per litre synthetic interstitial claywater (called "CCSICM + CP"). The SA/V values are 500, 2500 and 10000 m{-1}, the experimental temperatures are 40, 90 and 150 C. The maximum test duration is 720 days.
Accelerated tests, active: grains of glasses SON68 and SM539 are exposed to the same media as sub. The glasses are doped with either Pu/134Cs/90Sr or 237Np/99Tc/55Fe/241Am. The SA/V value is approximately 400 m{-1}. The experimental temperature is 90 C. The maximum test duration is 360 days.
Integrated tests, inactive: a first series of powdered samples of glasses SON68 and SM539 is exposed to a mixture of 250 g Ca-bentonite, 250 g Boom clay and 25 g Fe2O3 per litre synthetic interstitial claywater. A second series of powdered glasses is exposed to a mixture of 475 g Boom clay, 25 g Cibercor P40 cement and 25 g Fe2O3 per litre synthetic interstitial claywater. The SA/V values are 500 and 2500 m{-1}. The experimental temperatures are 40, 90 and 150 C. The maximum test duration is 720 days.
Integrated tests, active: grains of glasses SON68 and SM539 are exposed to a mixture of 250 g Ca-bentonite, 250 g Boom clay and 25 g Fe2O3 per litre synthetic interstitial claywater. The glasses are doped with the same radionuclides as for the active accelerated tests. SA/V, temperature and test durations are also the same as sub.
Modelling of the dissolution behaviour of the glass matrices in the studied clay disposal surroundings.

Champ scientifique (EuroSciVoc)

CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN. Voir: Le vocabulaire scientifique européen.

Vous devez vous identifier ou vous inscrire pour utiliser cette fonction

Programme(s)

Programmes de financement pluriannuels qui définissent les priorités de l’UE en matière de recherche et d’innovation.

Thème(s)

Les appels à propositions sont divisés en thèmes. Un thème définit un sujet ou un domaine spécifique dans le cadre duquel les candidats peuvent soumettre des propositions. La description d’un thème comprend sa portée spécifique et l’impact attendu du projet financé.

Appel à propositions

Procédure par laquelle les candidats sont invités à soumettre des propositions de projet en vue de bénéficier d’un financement de l’UE.

Données non disponibles

Régime de financement

Régime de financement (ou «type d’action») à l’intérieur d’un programme présentant des caractéristiques communes. Le régime de financement précise le champ d’application de ce qui est financé, le taux de remboursement, les critères d’évaluation spécifiques pour bénéficier du financement et les formes simplifiées de couverture des coûts, telles que les montants forfaitaires.

CSC - Cost-sharing contracts

Coordinateur

Organisme National des Déchets Radioactifs et des Matières Fissiles enrichies
Contribution de l’UE
Aucune donnée
Adresse
1,Place Madou - Boites 24/25
1030 Bruxelles
Belgique

Voir sur la carte

Coût total

Les coûts totaux encourus par l’organisation concernée pour participer au projet, y compris les coûts directs et indirects. Ce montant est un sous-ensemble du budget global du projet.

Aucune donnée

Participants (1)

Mon livret 0 0