Fundamental Processes of Coupled Radiation Damage and Mechanical Behavior in Nuclear Fuel Materials for High Temperature Reactors

Phillpot, Simon ; Tulenko, James

关键词: ALLOYS;    CERAMICS;    DESIGN;    FAST REACTORS;    FISSIONABLE MATERIALS;    IRRADIATION;    MECHANICAL PROPERTIES;    MICROSTRUCTURE;    NUCLEAR FUELS;    NUCLEAR INDUSTRY;    RADIATIONS;    SIMULATION;   

DOI  :  10.2172/1024384
RP-ID  :  DOE/ID14833
PID  :  OSTI ID: 1024384
Others  :  TRN: US201119%%345

美国|英语

来源: SciTech Connect

【 摘 要 】

The objective of this work has been to elucidate the relationship among microstructure, radiation damage and mechanical properties for nuclear fuel materials. As representative nuclear materials, we have taken an hcp metal (Mg as a generic metal, and Ti alloys for fast reactors) and UO2 (representing fuel). The degradation of the thermo-mechanical behavior of nuclear fuels under irradiation, both the fissionable material itself and its cladding, is a longstanding issue of critical importance to the nuclear industry. There are experimental indications that nanocrystalline metals and ceramics may be more resistant to radiation damage than their coarse-grained counterparts. The objective of this project look at the effect of microstructure on radiation damage and mechanical behavior in these materials. The approach to be taken was state-of-the-art, large-scale atomic-level simulation. This systematic simulation program of the effects of irradiation on the structure and mechanical properties of polycrystalline Ti and UO2 identified radiation damage mechanisms. Moreover, it will provided important insights into behavior that can be expected in nanocrystalline microstructures and, by extension, nanocomposites. The fundamental insights from this work can be expected to help in the design microstructures that are less susceptible to radiation damage and thermomechanical degradation.