INFLUENCE OF AZIMUTH AND RADIAL NEUTRON ANDTHERMAL SOURCES ANISOTROPY ON CONTACT PROBLEMSIMULATION IN REAL FUEL PELLET-CLADDINGCONFIGURATION USING FEM

摘要

Paper summarises results of development and testing effort to model 2D and 3D nonsymmetriccontact problem between fuel pellet and cladding using FEM. Interface betweenneutron and thermo-mechanical calculation models will be described. Corrosion layers andirradiation induced material properties degradation are treated in problem solution as well.Special interface programme for surface and volumetric source automatic input into theFEM COSMOS/M system was developed. Discussion of qualitative analysis of the resultsobtained by the new system using parametric simulation will be presented with accent to thecontact problem solution and the stress-strain field distribution in contact regions.Conclusions will be given for the further development effort and validation approach will bepresented.