Search for dissertations about: "uranium dioxide"

Found 4 swedish dissertations containing the words uranium dioxide.

  2. 1. 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. 2. Reducing Swedish Carbon Dioxide Emissions from the Basic Industry and Energy Utilities : An Actor and Policy Analysis

    Author : Peter Stigson; Hans Lundberg; Jinyue Yan; Tobias Persson; Mälardalens högskola; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Sweden; climate change; climate policy; energy policy; EU ETS; Kyoto Protocol; emissions trading; renewable energy certificates; energy tax; carbon dioxide tax; voluntary agreements; environmental law; energy utilities; basic industry; Sverige; klimatförändringar; klimatpolitik; energipolitik; EU ETS; Kyotoprotokollet; utsläppshandel; el-certifikat; energiskatter; koldioxidskatt; frivilliga avtal; program för energieffektivisering; miljölagstiftning; energiproducenter; basindustri; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN; Energy- and Environmental Engineering; energi- och miljöteknik;

    Abstract : The aim of the thesis is to analyze the design of the present climate and energy policies. The main focus is on how the policy instruments affect the Swedish stakeholders who are included in the European Union’s Emission Trading Scheme (EU-ETS). READ MORE

  5. 3. Thorium fuels for light water reactors - steps towards commercialization

    Author : Klara L Insulander Björk; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Halden research reactor; light water reactors; fuel performance; plutonium; Thorium; neutronic simulations;

    Abstract : Thorium-containing nuclear fuel is proposed as a means of gaining a number of benefits in the operation of light water reactors, some related to the nuclear properties of thorium and some related to the material properties of thorium dioxide. This thesis aims to investigate some of these benefits and to widen the knowledge base on thorium fuel behaviour, in order to pave the way for its commercial use. READ MORE

  6. 4. Studies of reactions occurring in the AUC-process : from UF₆ to sintered UO₂ pellets

    Author : Lars Hälldahl; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This study has been carried out to investigate the influence of process parameters upon the material characteristics during the conversion of UFg to UO2 powder, and the importance of variation in these charcteristics for the final quality of the sintered pellets. The first process step is a precipitation of ammonium uranyl carbonate (AUC) from UFg, ammonia and carbon dioxide. READ MORE