MgO2 doped UO2-10wt%Gd2O3 burnable poison and preparation method thereof
A technology of UO2 and content, applied in the field of MgO2-doped UO2-10wt% Gd2O3 combustible poison and its preparation, can solve the problems of reducing the sintering density, grain size and thermal conductivity of the combustible poison, and achieves good purity and crystal structure, Excellent mechanical properties and low sintering temperature
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Embodiment 1
[0047] In the first step, nuclear-grade pure U 3 o 8 Drying at 350°C for 2.5h, the Gd with a purity of 99.9% 2 o 3 The powder was dried at 550°C for 2h. Press UO 2 -10wt%Gd 2 o 3 Gd in burnable poison 2 o 3 The mass fraction accounted for is 89.9g UO 2 Powder (89.9wt%), 10g Gd 2 o 3 Put the powder (10wt%) into the dissolving tank, add a certain amount of deionized water to it, and add an appropriate amount of concentrated nitric acid to dissolve under rapid stirring conditions. After dissolving for 25 minutes, filter out the insoluble matter to form UO 2 (NO 3 ) 2 and Gd(NO 3 ) 3 homogeneously mixed solution.
[0048] Take MgO 2 Accounting for the mass ratio of the prepared combustible poison is calculated as 0.1wt%. Weigh 0.17g magnesium hydroxide and put it into a beaker, add a certain amount of deionized water to it, and add an appropriate amount of concentrated nitric acid to dissolve it under rapid stirring conditions. A stable solution of magnesium nitra...
Embodiment 2
[0054] Adopt the method identical with embodiment 1 to prepare MgO 2 doped UO 2 -10wt%Gd 2 o 3 Burnable poison, its difference with embodiment 1 is: MgO 2 Accounting for the content of the burnable poison is 0.3wt%, and the corresponding amount of magnesium hydroxide taken by weighing is 0.5g, UO 2 The powder was 89.7 g (89.7 wt%).
[0055] The theoretical density of the burnable poison prepared above is not lower than 96% T.D., the grain size is 14.7 μm, and the thermal conductivity is 0.052 W / (cm.° C.).
Embodiment 3
[0057] Adopt the method identical with embodiment 1 to prepare MgO 2 doped UO 2 -10wt%Gd 2 o 3 Burnable poison, its difference with embodiment 1 is: MgO 2 The content accounting for the burnable poison is 0.5wt%, and the corresponding amount of magnesium hydroxide taken by weighing is 0.85g, UO 2 The powder was 89.5 g (89.5 wt %).
[0058] The theoretical density of the burnable poison prepared above is not lower than 96% T.D., the grain size is 16.5 μm, and the thermal conductivity is 0.059 W / (cm.° C.).
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