Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
The fuel test rod is the basic element for carrying out the fuel irradiation test, and its temperature performance determines whether the irradiation test can be carried out smoothly. Many factors can affect the temperature performance of fuel test rods, including structure, materials, thermal and cooling conditions. This paper first establishes a one-dimensional radial heat transfer model of fuel test rod according to certain assumptions, and analyzes the main criteria for evaluating its temperature performance according to the basic criteria of irradiation test, including the maximum temperature of fuel, cladding and the outside of protective tube. Therefore, according to the different thermal resistance layer thickness, protective tube thickness and coolant flow rate established three conditions, the impact of these three factors on the maximum temperature of cladding was analyzed. Then, the temperature of fuel test rod is compared under theoretical calculation and numerical calculation, which proves that the one-dimensional model can accurately assess the influence of various factors. Finally, the effects of other factors such as the temperature of coolant, the linear heat rate (LHR) of fuel, the γ heat rate and the porosity of fuel are analyzed. The results show that the influence caused by coolant temperature change is relatively limited, the influence of LHR is very significant, the influence of γ heat rate cannot be ignored, and the influence of porosity of fuel is within acceptable limits.
