Search for dissertations about: "bentonite"

Showing result 11 - 15 of 41 swedish dissertations containing the word bentonite.

  2. 11. Experimental studies of radiation-induced dissolution of UO2 : The effect of intrinsic solid phase properties and external factors

    Author : Alexandre Barreiro Fidalgo; Mats Jonsson; David Shoesmith; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Oxidation; dissolution; uranium dioxide; gadolinium; bentonite; sulfide; hydrogen; gamma radiation; radiolysis; hydrogen peroxide; hydroxyl radical; repository; Kemi; Chemistry;

    Abstract : Dissolution of the UO2 matrix is one of the potential routes for radionuclide release in a future deep geological repository for spent nuclear fuel. This doctoral thesis focuses on interfacial reactions of relevance in radiation-induced dissolution of UO2 and is divided in two parts:In the first part, we sought to explore the effects of solid phase composition:The impact of surface stoichiometry on the reactivity of UO2 towards aqueous radiolytic oxidants was studied. READ MORE

  4. 12. Geochemical modelling of groundwater chemistry in the vicinity of a repository for spent nuclear fuel

    Author : Irene Lundén; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; groundwater; uranium; pH; Eh; PHREEQE; geochemical calculations; clay; spent nuclear fuel; standard portland cement; neptunium; rock; DISSOL; bentonite; speciation;

    Abstract : .... READ MORE

  5. 13. Oxidation of titanium in aqueous solutions

    Author : Håkan Mattsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nuclear waste; TEM; corrosion; ESCA; Aqueous solution; titanium; bentonite; surface composition; oxidation;

    Abstract : .... READ MORE

  6. 14. Numerical modeling of groundwater and air flow between compacted bentonite and fractured crystalline rock

    Author : Benoît Dessirier; Jerker Jarsjö; Andrew Frampton; Stefan Finsterle; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Two-phase flow; porous media; fractured media; compacted bentonite; crystalline rock; numerical modeling; geological disposal; Physical Geography; naturgeografi;

    Abstract : The geological repository for final storage of spent nuclear fuel, envisioned by the Swedish Nuclear Fuel and Management Company (SKB), relies on several barriers: copper canisters deposited in holes in the floor of underground tunnels in deep bedrock, embedded in a buffer of compacted bentonite. The initially unsaturated buffer would take up water from the surrounding rock mass and swell to seal any potential gap. READ MORE

  7. 15. Diffusion of cations in bentonite clay : laboratory and in-situ studies

    Author : Mats Jansson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Kemi;

    Abstract : .... READ MORE