Integrated Thermal/Mechanical Analysis of Assembly and Irradiation of Annular, LEU-foil Based Target
نویسنده
چکیده
The thermalmechanical safety analysis of a lowenriched uranium foil based annular target for molybdenum-99 production will be presented. The target constitutes a low enriched uranium foil sandwiched between two concentric aluminum tubes to form a composite cylindrical structure. A threestep numerical model is built using the commercial finite element code Abaqus FEA to simulate the assembly process, obtain the residual stresses, and simulate the invessel irradiation of the annular target. Due to the threestep modeling approach, the residual stresses from the assembly process are automatically used as initial inputs to the thermalmechanical irradiation model. The safety acceptance criteria assumed that the thermally induced stresses and the temperatures in the cladding, after irradiation, would be within the yield strength and the melting point of the cladding material respectively. Discussions of the safety analysis results and the thermalmechanical stress margins will be provided.
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