Sökning: "UO2"
Visar resultat 16 - 20 av 44 avhandlingar innehållade ordet UO2.
16. The effect of solid state inclusions on the reactivity of UO2 : A kinetic and mechanistic study
Sammanfattning : The release of radionuclides is a key process in the safety assessment of a deep geological repository for spent nuclear fuel. A large fraction of the release is assumed to be a consequence of dissolution of the fuel matrix, UO2. In this doctoral thesis, the kinetics and the mechanisms behind oxidative U(IV) dissolution were studied. LÄS MER
17. Measurement and Modelling using Surface Complexation of Cation (II to VI) Sorption onto Mineral Oxides
Sammanfattning : The aim of this work was to experimentally and theoretically study some surface complexation models and how well these can be applied to a simple system. This is done while keeping in mind the interest in including some type of chemical model in performance assessment calculations for much more complex systems. LÄS MER
18. Studies of surface complexation of H⁺, NpO₂⁺, Co²⁺, Th⁴⁺ onto TiO₂ and H⁺, UO₂²⁺ onto alumina
Sammanfattning : .... LÄS MER
19. Redox Chemistry in Radiation Induced Dissolution of Spent Nuclear Fuel : from Elementary Reactions to Predictive Modeling
Sammanfattning : The focus of this doctoral thesis is the redox chemistry involved in radiation induced oxidative dissolution of spent nuclear fuel and UO2 (as a model substance for spent nuclear fuel). It is shown that two electron oxidants are more efficient than one electron oxidants in oxidative dissolution of UO2 at low oxidant concentrations. LÄS MER
20. Influence of metallic fission products and self irradiation on the rate of spent nuclear fuel-matrix dissolution
Sammanfattning : Denna licentiatavhandling behandlar effekten av två inneboende egenskaper (fissions produkter och egenbestrålning) hos utbränt kärnbränsle på hastigheten för strålningsinducerad upplösning av bränslematris (UO2). I ett framtida djupförvar kommer det utbrända kärnbränslet att deponeras 500 meter ner i berggrunden i en reducerande miljö. LÄS MER