Tarasov V. Computer simulation of a radiation creep of a reactor fuel on the example of uranium and its alloys.

The new model of a radiation creep is explained within the framework of the mechanism of sliding and climbing dislocations based on the conception of a dislocation as not ideal sink for point radiation defects (PRD). The offered model is efficient for installed concentration of PRD, which considerably exceeding thermally steady state concentration. The "dynamics" method for simulation of a flexible dislocation moving is developed. The computer program complex simulating the radiation creep is developed. The outcomes of a computer research of a kinetics of a flexible dislocation interacting to obstacles of a various type (spherical centers and dislocation loops) for various installed concentration of PRD are presented. The temperature curves of installed velocity of a radiation creep for uranium and its alloys with small additions of molybdenum (from 0,9 % to 1,3 %) are obtained.