Sökning: "uranium IV"

Visar resultat 1 - 5 av 16 avhandlingar innehållade orden uranium IV.

  1. 1. Accident-tolerant uranium nitride

    Författare :Aneta Herman; []
    Nyckelord :accident-tolerant fuel; uranium nitride; chromium; glucose; internal sol-gel;

    Sammanfattning : After the nuclear accident at Fukushima-Daiichi in 2011, a search for alternatives to a current fuel-clad standard UO2-Zircaloy was encouraged by government and industry and novel fuel-clad systems were selected. These systems are often referred to as Accident Tolerant systems, because of an improved response to severe accidents. LÄS MER

  2. 2. The mobility of natural uranium at Forsmark, Sweden, through geologic time

    Författare :Lindsay Krall; Carl-Magnus Mörth; David Read; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; uranium; radium; mineralogy; geochronology; submarine groundwater discharge; spent nuclear fuel; geochemical modelling; Geology; geologi;

    Sammanfattning : In this thesis, the response of uranium minerals and poorly crystalline phases to changes in geochemical conditions through geological time has been assessed in order to understand the mobility of natural uranium in the fracture network of a proposed site for a spent nuclear fuel repository in Forsmark, Sweden. Identification and characterization of solid phase uranium have been performed through electron microprobe analysis and optical petrography (Article I). LÄS MER

  3. 3. Surface Complexation Studies in An (Th, U(IV), Pu(VI)) Systems

    Författare :Mattias Olsson; Chalmers University of Technology; []
    Nyckelord :surface complexation; sorption; adsorption; uranium; surface charge; FITEQL; plutonium;

    Sammanfattning : Two-phase systems containing an electrolyte solution and a suspended solid were studied. The common denominator for the three systems examined in this work is that they contain actinides (elements of atomic numbers between 89 and 103) in either the solid phase or as a sorbate. Experiments were done on simple oxides. LÄS MER

  4. 4. The Use of Aliquat-336 in a Partitioning and Transmutation Process and a Kinetic Study of the Oxidation of U(IV) to U(VI)

    Författare :Anders Landgren; Chalmers University of Technology; []
    Nyckelord :partitioning; quaternary ammonium salts; transmutation; hydrolysis; Aliquat-336; liquid-liquid extraction; kinetics; oxidation; uranium IV ;

    Sammanfattning : Spent nuclear fuel contains several long-lived radionuclides that must be stored in a safe manner for a long time. Transmutation of these radionuclides into short-lived or stable nuclides reduces the necessary storage time by several orders of magnitude. The nuclides most suitable for transmutation are those of the actinides. LÄS MER

  5. 5. Coordination Chemistry of Actinide and Lanthanide Ions

    Författare :Ildiko Farkas; KTH; []
    Nyckelord :water exchange; dynamics. Uranium IV ; Thorium IV ; acuq ions; lanthanides; ;

    Sammanfattning : .... LÄS MER