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A kind of cao-doped uo2-10wt% gd2o3 combustible poison and preparation method thereof

A technology of UO2 and mixed solution, which is applied in the field of CaO-doped UO2-10wt% Gd2O3 burnable poison and its preparation, can solve the problems of reducing the sintering density, grain size and thermal conductivity of burnable poison, and achieve good purity and crystal structure , excellent mechanical properties and low sintering temperature

Active Publication Date: 2017-12-15
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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  • A kind of cao-doped uo2-10wt% gd2o3 combustible poison and preparation method thereof
  • A kind of cao-doped uo2-10wt% gd2o3 combustible poison and preparation method thereof

Examples

Experimental program
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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 89.6g UO 2 Powder (89.6wt%), 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] Calculating that the mass ratio of CaO to the prepared combustible poison is 0.4wt%, weigh 0.6g of calcium 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 under rapid stirring conditions A stable calcium nitrate solution is obtained after dissolution. Slo...

Embodiment 2

[0054] CaO-doped UO was prepared by the same method as in Example 1 2 -10wt%Gd 2 o 3 Burnable poison, its difference with embodiment 1 is: CaO accounts for the content of described burnable poison to be 0.1wt%, the amount corresponding to taking calcium hydroxide is 0.15g, UO 2 The powder was 89.9 g (89.9 wt%).

[0055] The theoretical density of the burnable poison prepared above is not lower than 95.5% T.D., the grain size is 13.4 μm, and the thermal conductivity is 0.049W / (cm.°C).

Embodiment 3

[0057] CaO-doped UO was prepared by the same method as in Example 1 2 -10wt%Gd 2 o 3 Burnable poison, its difference with embodiment 1 is: the content of CaO accounting for described burnable poison is 0.3wt%, the amount corresponding to taking calcium hydroxide is 0.45g, UO 2 The powder was 89.7 g (89.7 wt%).

[0058] The theoretical density of the burnable poison prepared above is not lower than 95.5% T.D., the grain size is 14.2 μm, and the thermal conductivity is 0.050 W / (cm.° C.).

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Abstract

The invention discloses a CaO-doped UO2-10wt% Gd2O3 burnable poison and a preparation method thereof. The CaO doped with UO2-10wt% Gd2O3 is composed of the following components by weight percentage: CaO 0-0.5wt%; Gd2O3 10wt%; the balance is UO2. The present invention also provides a method for preparing the above-mentioned burnable poison, which has simple process and low cost, and the prepared burnable poison has excellent grain size, sintered density and thermal conductivity. In the present invention, by doping CaO in the UO2-10wt% Gd2O3 burnable poison, the burnable poison with increased gadolinium oxide concentration still has excellent sintered 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 CaO-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 the UO 2 -Gd 2 o 3 The difficulty of preparing burnable poison is much higher than that of UO 2 pellets. Under the same sinterin...

Claims

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Application Information

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Patent Type & Authority Patents(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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