Rate Theory Modeling and Simulations of Silicide Fuel at LWR Conditions

Miao, Yinbin¹  Ye, Bei¹  Mei, Zhigang¹  Hofman, Gerard¹  Yacout, Abdellatif¹ 

[1] Argonne National Lab. (ANL), Argonne, IL (United States)

关键词: URANIUM SILICIDES;    FISSION PRODUCTS;    NUCLEAR FUELS;    SIMULATION;    WATER MODERATED REACTORS;    DENSITY FUNCTIONAL METHOD;    SWELLING;    WATER COOLED REACTORS;    ACCIDENTS;    PERFORMANCE;    FUEL-CLADDING INTERACTIONS;    BUBBLES;    CORRELATIONS;    OPTIMIZATION;    FEASIBILITY STUDIES;    SIZE;    TIME DEPENDENCE;   

DOI  :  10.2172/1232625
RP-ID  :  ANL/NE--15/40
PID  :  OSTI ID: 1232625
Others  :  Other: 123625
Others  :  TRN: US1600182

美国|英语

来源: SciTech Connect

【 摘 要 】

Uranium silicide (U₃Si₂) fuel has higher thermal conductivity and higher uranium density, making it a promising candidate for the accident-tolerant fuel (ATF) used in light water reactors (LWRs). However, previous studies on the fuel performance of U₃Si₂, including both experimental and computational approaches, have been focusing on the irradiation conditions in research reactors, which usually involve low operation temperatures and high fuel burnups. Thus, it is important to examine the fuel performance of U₃Si₂ at typical LWR conditions so as to evaluate the feasibility of replacing conventional uranium dioxide fuel with this silicide fuel material. As in-reactor irradiation experiments involve significant time and financial cost, it is appropriate to utilize modeling tools to estimate the behavior of U₃Si₂ in LWRs based on all those available research reactor experimental references and state-of-the-art density functional theory (DFT) calculation capabilities at the early development stage. Hence, in this report, a comprehensive investigation of the fission gas swelling behavior of U₃Si₂ at LWR conditions is introduced. The modeling efforts mentioned in this report was based on the rate theory (RT) model of fission gas bubble evolution that has been successfully applied for a variety of fuel materials at devious reactor conditions. Both existing experimental data and DFT-calculated results were used for the optimization of the parameters adopted by the RT model. Meanwhile, the fuel-cladding interaction was captured by the coupling of the RT model with simplified mechanical correlations. Therefore, the swelling behavior of U₃Si₂ fuel and its consequent interaction with cladding in LWRs was predicted by the rate theory modeling, providing valuable information for the development of U₃Si₂ fuel as an accident-tolerant alternative for uranium dioxide.