Sökning: "helium release"

Hittade 4 avhandlingar innehållade orden helium release.

  1. 1. Helium measuring system for on-line fuel and control rod integrity surveillance in BWRs

    Författare :Irina Larsson; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; helium measurements; helium release; fuel and control rod failures;

    Sammanfattning : Accurate supervision of fuel and control rod integrity in a nuclear reactor core is very important for maintaining a safe and reliable operation of the reactor. Fuel rod failures can cause increased doses to personnel in the power plant, increased backend costs, limitations of the reactor operation and unplanned shut downs, which can lead to large economic losses. LÄS MER

  2. 2. Transport in Oxides Studied by Gas Phase Analysis

    Detta är en avhandling från Stockholm : KTH

    Författare :Qian Dong; KTH.; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Gas Phase Analysis; metal; oxide; platinum; vitreous silica; yttria stabilized zirconia; diatomic gas; oxidation; dissociation; permeation; uptake release.; TECHNOLOGY Chemical engineering; TEKNIKVETENSKAP Kemiteknik;

    Sammanfattning : The transport in oxides is studied by the use of gas phase analysis (GPA). An experimental method to identify transported species of gases and their contribution to the overall transport of gases in oxides and an experimental method to evaluate the parameters diffusivity, concentration, permeability of gases in oxides and effective pore size in oxides are developed, respectively. LÄS MER

  3. 3. Ion Beam Analysis of First Wall Materials Exposed to Plasma in Fusion Devices

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Per Petersson; Uppsala universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ion beam analysis; Microbeam; Plasma wall interaction; Deuterium; Beryllium; Carbon fibre composites; Divertor; Nuclear reaction analysis; Helium-3; TECHNOLOGY Engineering physics Plasma physics with fusion; TEKNIKVETENSKAP Teknisk fysik Plasmafysik med fusion; Ion Physics; Jonfysik;

    Sammanfattning : One major step needed for fusion to become a reliable energy source is the development of materials for the extreme conditions (high temperature, radioactivity and erosion) caused by hot plasmas. The main goal of the present study is to use and optimise ion beam methods (lateral resolution and sensitivity) to characterise the distribution of hydrogen isotopes that act as fuel. LÄS MER

  4. 4. First-principles study of defects instructural materials

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Li Ruihuan; KTH.; [2016]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials Science and Engineering; Teknisk materialvetenskap;

    Sammanfattning : In this thesis, first we focus on the Helium (He) and He bubbles behavior in three kinds of the most promising candidate structural materials for future fusion reactor. These materials are vanadium, silicon carbide (SiC) composites, and reduced activation ferritic-martensitic (RAFM) steels. LÄS MER