Some Analytical and Numerical Results for Cladded Fuel Rods Subjected to Thermoirradiation Induced Creep.

摘要

Stresses and velocities are analyzed for a hollow cylinder of fuel encased in metallic cladding and subjected to high temperature and high neutron flux fields. The material is represented by a compressible nonlinear thermoirradiation viscoelastic model. A stress function for axisymmetric plane strain is introduced, and the problem essentially reduces to solving a nonlinear ordinary differential equation in the interfacial contact pressure. Some analytic results are obtained for the case of material properties independent of position. For the case of temperature, flux and thus material properties dependent on position, an approximate formulation is employed whereby the cylinder is divided into discrete rings with constant properties. (Author)