A method and system for analyzing the expansion behavior of uranium-silicon compound nuclear fuel caused by fission gas
A fission gas and silicon compound technology, applied in the field of material science, can solve the problems of unable to simulate for a long time, the system is difficult to create catalogs, and it is difficult to capture bubbles, etc., so as to save costs, reduce labor and computing resource consumption, and be repeatable strong effect
Active Publication Date: 2022-02-22
XI AN JIAOTONG UNIV
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] It is difficult to capture the diffusion of bubbles by experimental observation, and the traditional molecular dynamics simulation cannot be simulated for a long time due to the limitation of atomic vibration
The dynamic Monte Carlo or phase field crystal method can simulate long-term diffusion behavior, but it is difficult for the dynamic Monte Carlo method to create a complete catalog for complex systems, and the phase field crystal method mainly solves problems such as high temperature solidification near the melting point, the above The method has certain limitations for simulating long-term gas atom diffusion and nuclear fuel failure behavior.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0047] refer to figure 1 , with U 3 Si 2 As an example, a method for analyzing the expansion behavior of uranium-silicon compound nuclear fuel caused by fission gas provided by the present invention is described in detail, including the following steps:
[0048] S1. Establish U for simulation experiments 3 Si 2 Theoretical model of bubble evolution rate.
[0049]Specifically, in this step S1, a theoretical model of bubble evolution rate is established based on the GRASS-SST method developed by J.Rest, and the model equation is mainly described by the specific physical behavior of bubbles.
[0050] According to the experimental data of uranium-silicon fission, the diffusion parameters of gas atoms and bubbles are selected, and the c b 、c g and m b Equation to calculate the concentration distribution of bubbles after long-term evolution at different temperatures, and the evolution time equation is:
[0051]
[0052]
[0053]
[0054] Among them, D g is the bubb...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for analyzing the expansion behavior of U3Si2 nuclear fuel caused by fission gas. Including: establishing a theoretical model for calculating the rate of atomic diffusion of uranium-silicon nuclear fuel gas; fitting experimental results with high precision based on different boundary conditions and environmental variables; calculating the size and number of bubbles at different times at different temperatures, and calculating gas The fuel expansion rate caused by diffusion behavior; calculate the relationship between the fission density and the instantaneous fission rate at the expansion point, and calculate and analyze the formation reason of the bubble interconnection at the expansion point. The invention can be used to analyze the expansion behavior of nuclear fuel caused by fission gas under the condition of uranium-silicon nuclear fuel experimental reactor. The analysis results are reliable, highly repeatable and easy to implement.
Description
technical field [0001] The invention relates to the field of material science, in particular to a method and system for analyzing the expansion behavior of uranium-silicon compound nuclear fuel caused by fission gas. Background technique [0002] The accident at the Fukushima nuclear power plant caused by the Great East Japan Earthquake and Tsunami raised questions about the safety of oxidized nuclear fuel, which inspired the global development of a new type of accident-tolerant nuclear fuel (ATF) to replace the existing "uranium dioxide fuel-zirconium alloy". "Cladding" system to enhance the system's tolerance to nuclear accidents. At present, uranium-silicon series nuclear fuels with a variety of compound types have entered people's field of vision. Uranium-silicon compounds have good high-temperature stability under irradiation conditions, and have higher uranium density than UO2 (far exceeding UC and Oxygen). uranium) and thermal conductivity (comparable to uranium carb...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G16C60/00
CPCG16C60/00
Inventor 丁向东毛泽宇
Owner XI AN JIAOTONG UNIV