Kinetics of stressed-strained state of cylindrical fuel elements with thin-walled envelopes

Described is the algorithm for solution of the problem relating to kinetics of the deformed-stressed state of the fuel element, which is based on the finite difference method. The nonlinear relationship between the stresses and deformations is reduced to the system of the transcendental equations for the functions describing this relationship. To improve stability of the differential circuitry and convergence of the range method during solution of the finite difference equations, there is introduced a regularization parameter. Considered are cylindrical axially-symmetrical rod-type (solid and hollow) and annular fuel elements with thin-walled jackets. The calculations are performed with due account for the plastic deformation, creep deformation, fuel and jacket swelling, coolant pressure, and irregularity of the temperature field. The calculation results are cited