ANALYSIS OF THERMOMECHANICAL INTERACTIONS AND PROPERTIES OF CERAMIC BREEDER BLANKETS

Analysis of the thermomechanical interactions of fusion blanket materi als and physical elements, particularly those involving particle bed d esign concepts, have been performed. The results show that the stress caused by the high thermal expansion of the blanket particle bed mater ial is not excessive enough to be of concern for the structural materi al. However, its magnitude could lead to ceramic particle breakage if the bed behaves like a solid material. Furthermore, the calculations s how that the clad deflection caused by this stress could lead to a pos sible separation between the bed and clad, which would add an unfavora ble thermal resistance to the region and increase local temperature. A comparison between the estimated stress extrapolated from the experim ental data and the analytical results shows that the thermomechanical performance of the pebble bed approaches that of solid materials. (C) 1998 Elsevier Science S.A. All rights reserved.