Synchrotron characterization of nanograined UO2 grain growth

Mo, Kun¹  Miao, Yinbin¹  Yun, Di¹  Jamison, Laura M.¹  Lian, Jie²  Yao, Tiankei² 

[1] Argonne National Lab. (ANL), Argonne, IL (United States);Rensselaer Polytechnic Inst., Troy, NY (United States)

关键词: URANIUM DIOXIDE;    GRAIN SIZE;    GRAIN GROWTH;    EXPERIMENTAL DATA;    SYNCHROTRON RADIATION;    VALIDATION;    MOLECULAR DYNAMICS METHOD;    COMPUTERIZED SIMULATION;    ACTIVATION ENERGY;    COMPARATIVE EVALUATIONS;    ANNEALING;    TIME DEPENDENCE;    TEMPERATURE DEPENDENCE;    KINETICS;    STOICHIOMETRY;    MICROSTRUCTURE;   

DOI  :  10.2172/1227386
RP-ID  :  ANL/NE--15/25
PID  :  OSTI ID: 1227386
Others  :  Other: 121528
Others  :  TRN: US1500911

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来源: SciTech Connect

【 摘 要 】

This activity is supported by the US Nuclear Energy Advanced Modeling and Simulation (NEAMS) Fuels Product Line (FPL) and aims at providing experimental data for the validation of the mesoscale simulation code MARMOT. MARMOT is a mesoscale multiphysics code that predicts the coevolution of microstructure and properties within reactor fuel during its lifetime in the reactor. It is an important component of the Moose-Bison-Marmot (MBM) code suite that has been developed by Idaho National Laboratory (INL) to enable next generation fuel performance modeling capability as part of the NEAMS Program FPL. In order to ensure the accuracy of the microstructure based materials models being developed within the MARMOT code, extensive validation efforts must be carried out. In this report, we summarize our preliminary synchrotron radiation experiments at APS to determine the grain size of nanograin UO₂. The methodology and experimental setup developed in this experiment can directly apply to the proposed in-situ grain growth measurements. The investigation of the grain growth kinetics was conducted based on isothermal annealing and grain growth characterization as functions of duration and temperature. The kinetic parameters such as activation energy for grain growth for UO₂ with different stoichiometry are obtained and compared with molecular dynamics (MD) simulations.