Core management and fuel handling operations: experience on the UKAEA prototype fast reactor at Dounreay

Core components in a fast reactor undergo neutron induced void formation and irradiation induced creep which give rise to structural deformation. Such distortions can reduce component life expectancy and lead to problems with component handling. In order to maximise component life and minimise handling difficulties core management techniques must take account of predicted distortions and compensate where possible for such effects. Experience at the Prototype Fast Reactor (PFR) at Doureay is described herein, with emphasis on the handling of some significantly distorted items. Steps taken to increase the life expectancy of components such as guide tubes and absorber rods are discussed and fuel management techniques developed to predict the distortion described. (author)