Sökning: "kärnreaktor"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet kärnreaktor.

  1. 1. Investigation of coarse-grid CFD approach for nuclear engineering application

    Master-uppsats, KTH/Fysik

    Författare :Michela Casarella; [2023]
    Nyckelord :Thermal-hydraulics; Nuclear reactor; CFD; Sub-channel; Coarse-grid; Turbulence; Pressure drop; Termisk-hydraulik; kärnreaktor; CFD; underkanal; grovkornigt nät; turbulens; tryckfall;

    Sammanfattning : In this thesis, an innovative coarse grid CFD approach is developed that aims toexploit the capabilities of sub-channel codes and CFD methods while overcoming theirlimitations. In the approach, a very coarse mesh is implemented in the CFD softwareOpenFOAM and a new wall treatment, based on the traditional concept of the wallfunction, is applied to the wall boundary conditions of the domain to take into accountthe low resolution of the grid which does not allow to effectively capture the effect of thesolid walls on the thermo-hydraulics of the flow. LÄS MER

  3. 2. Modellering, simulering och analys av kärnreaktorn BWRX-300

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad kärnfysik

    Författare :Erik Backlund; [2023]
    Nyckelord :Kärnkraft; SMR; små modulära reaktorer; liten modulär reaktor; kärnreaktor; BWR; BWRX-300; självcirkulation; passiv säkerhet; GE Hitachi; cykellängd; härddesign; nukleär design; Simulate5; GNF2; kärnbränsle; reaktormodell;

    Sammanfattning : The demand for fossil-free energy production is rising due to electrification and increased consumption in the energy system. There are also multiple climate goals to reach, to preserve the possibilities of a sustainable future. LÄS MER

  4. 3. BWR Reactor Fuel Channel Manufacturing Simulations

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Kalle Norell; [2022]
    Nyckelord :Bending; Boiling water reactor; Fuel channel; FEM; Bockning; Kokvattenreaktor; Höljerör; FEM;

    Sammanfattning : Fuel channels are used to keep the components of a nuclear fuel bundle in place. The fuel channel of a new nuclear fuel which is being developed at Westinghouse has a complex geometry which creates challenges in the manufacturing process. FE simulations were developed of a two-stage forming process of the fuel channel. LÄS MER

  5. 4. Modelling of liquid leakage with ASTEC in a severe accident of a PWR

    Master-uppsats, KTH/Fysik

    Författare :Thomas Begey; [2022]
    Nyckelord :Nuclear Physics; Modelling; Iodine Chemstry; Nuclear Safety; Kärnfysik; modellering; jodkemi; kärnsäkerhet;

    Sammanfattning : In a nuclear reactor, in case of a severe accident occurs, backup circuits are usedlike SIS and CSS, flooding the reactor with water. This might lead to many liquidleakages outside the reactor containment building. LÄS MER

  7. 5. Investigation on Operation of the Compact Molten Salt Reactor by Modelling the Primary Circuit in GeN-FOAM

    Master-uppsats, KTH/Fysik

    Författare :Jelle Oving; [2022]
    Nyckelord :molten salt reactor; GeN-Foam; delayed neutrons; OpenFOAM; multi-physics; smältsaltreaktor; GeN-Foam; fördröjda neutroner; OpenFOAM; multifysik;

    Sammanfattning : In recent years there has been a revision of the molten salt nuclear reactor concept for production of power. Moving of fissile material throughout the primary circuit for these types of reactors creates the necessity of novel physics solvers to study movement of delayed neutron precursors, plant operation, accident scenario's; crucial for design. LÄS MER