Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
Fission gas will induce a series of changes in fuel rod performance after the accident. The amount of fission gas will increase dramatically under accidental conditions. Fuel rod internal pressure and temperature will rise subsequently owing to the gap conductance between the fuel pellet and cladding aggravating. And then fuel rod performance will degrade. Therefore, the investigation of fission gas behavior is worthwhile and significant for assessing the accidents and evaluating the fuel rod performance. Furthermore, the effect of fission gas on the fuel rod is supposed to be minimized. Therefore, predicting fission gas release (FGR) is essential for the integrity and safety of nuclear reactors. The fission gas release in a Light Water Reactor (LWR) is modeled by COMSOL Multiphysics with finite element method under normal or abnormal conditions, and the latter is classified as the Class-II type incidents. This model assumes gas diffusion varies with time inside a spherical grain. Perfect sinks with gas production, perfect sinks without gas production, and imperfect sinks under steady-state conditions are studied by setting different initial and boundary conditions. Inputting parameters from other models and experiments and comparing their results have validated the accuracy and universality of expressions possible.
