Three dimensional coupled simulation of thermomechanics, heat, and oxygen diffusion in nuclear fuel rods

Material Performance of Fully-Ceramic Micro-Encapsulated Fuel under Selected LWR Design Basis Scenarios: Final Report

“…typically a finite element code, such as BISON [27], would also allow for the evaluation of matrix effects. In any case, three-dimensional modeling of coated particle fuel in matrix material is recommended.…”

Multiphysics modeling of UO2-SiC composite fuel performance with enhanced thermal and mechanical properties

“…This module defines the temperature, (K), by the heat conduction equation: (37) where , and are the material properties of density, specific heat capacity and thermal conductivity, respectively. We can define all the material properties in the "Materials" module.…”

“…A hyperstoichiometric model for oxygen diffusion is adopted from Newman et al [37], which is also used in the BISON code. In this case denotes the oxygen flux within the hyperstoichiometric regime with,…”

BISON Theory Manual The Equations behind Nuclear F

“…The mass flux J is specified as J = −D∇C, (2.4) where D is the diffusion coefficient; this definition has been used to simulate fission product transport within the fuel. Also implemented in BISON is a hyperstoichiometric model for oxygen diffusion in UO 2 fuel as described in [5]. In this case J denotes the oxygen flux in the hyperstoichiometric regime with, 5) where D is diffusivity, F is the thermodynamic factor of oxygen, Q * is the heat of transport of oxygen, and R is the universal gas constant.…”

“…Also implemented in BISON is a hyperstoichiometric model for oxygen diffusion in UO 2 fuel as described in [5]. In this case J denotes the oxygen flux in the hyperstoichiometric regime with, 5) where D is diffusivity, F is the thermodynamic factor of oxygen, Q * is the heat of transport of oxygen, and R is the universal gas constant. Momentum conservation is prescribed assuming static equilibrium at each time increment using Cauchy's equation, 6) where σ is the Cauchy stress tensor and f is the body force per unit mass (e.g.…”