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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

Active Publication Date: 2015-08-05
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the concentration of gadolinium oxide increases, the UO will be further reduced 2 -Gd 2 o 3 Sintered Density, Grain Size and Thermal Conductivity of Burnable Poisons

Method used

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  • MgO2 doped UO2-10wt%Gd2O3 burnable poison and preparation method thereof
  • MgO2 doped UO2-10wt%Gd2O3 burnable poison and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses an MgO2 doped UO2-10wt%Gd2O3 burnable poison and a preparation method thereof. The MgO2 doped UO2-10wt%Gd2O3 is composed of the following components by weight: 0-0.7wt% of MgO2, 10wt% of Gd2O3, and the balance UO2. The invention also provides a method for preparation of the burnable poison. The method is simple in process and low in cost, and the prepared burnable poison has excellent grain size, sintering density and thermal conductivity. By doping MgO2 in the UO2-10wt%Gd2O3 burnable poison, the gadolinium oxide concentration increased burnable poison can still have excellent sintering density, grain size and thermal conductivity.

Description

technical field [0001] The invention belongs to the field of nuclear industry fuel, in particular, relates to a kind of MgO 2 doped UO 2 -10wt%Gd 2 o 3 Burnable poison and method for its preparation. Background technique [0002] UO is widely used in nuclear power reactors at home and abroad, especially in the core of pressurized water reactor nuclear power plants. 2 -Gd 2 o 3 Poison fuel can be burned to control the initial reactivity of the reactor, to flatten the power distribution of the core, to increase the fuel consumption, and to prolong the refueling cycle, thereby reducing the operating cost of nuclear power and improving the safety and reliability of operation. UO currently used in nuclear power plants 2 -Gd 2 o 3 Preparation method of burnable poison though and commercial UO 2 The manufacturing process of the pellets is similar, but UO 2 -Gd 2 o 3 The difficulty of preparing burnable poison is much higher than that of UO 2 pellets. Under the same s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C7/04G21C21/18
CPCG21C7/04G21C21/18Y02E30/30
Inventor 王辉潘小强黄华伟解怀英尹昌耕邱绍宇
Owner NUCLEAR POWER INSTITUTE OF CHINA
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