Essays about: "kärnreaktor"

Found 5 essays containing the word kärnreaktor.

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

   University essay from KTH/Fysik

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

   Abstract : 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. READ MORE

3. 2. BWR Reactor Fuel Channel Manufacturing Simulations

   University essay from KTH/Hållfasthetslära

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

   Abstract : 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. READ MORE

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

   University essay from KTH/Fysik

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

   Abstract : 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. READ MORE

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

   University essay from KTH/Fysik

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

   Abstract : 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. READ MORE

6. 5. Validating results from the Molten Salt Reactor Experiment by use of turbulent CFD simulations : A study of a modified U-tube shell-and-tube primary heat exchanger and radiator with molten salts

   University essay from Luleå tekniska universitet/Rymdteknik

   Author : Malcolm Akner; [2021]
   Keywords : CFD; MSRE; CAD; CHT; experiment; molten; liquid; salt; fluid mechanics; mechanics; fluid; LTU; nuclear; reactor; nuclear reactor; generation four; generation IV; copenhagen atomics; copenhagen; atomics; space engineering; space; engineering; aerospace; thesis; master s thesis; master s; Malcolm; Akner; Erik; CFD; MSRE; CAD; CHT; flytande; salt; strömningslära; strömningsmekanik; fluid; fluidmekanik; LTU; kärnreaktor; generation fyra; generation IV; copenhagen atomics; rymdteknik; flygteknik; ingenjör; civilingenjör; examensarbete; Malcolm; Akner; Erik;

   Abstract : Background Nuclear reactors utilizing molten fuels rather than solid fuels show a massive advantage in energy yield, waste handling and safety features. The only successful reactor utilizing a molten fuel was called the ‘Molten Salt Reactor Experiment’ (MSRE), built and operated in the Oak Ridge national laboratory (ORNL) in Tennessee, U.S.A. READ MORE