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TiO2 doped UO2-10wt% Gd2O3 burnable poison and preparation method of TiO2 doped UO2-10wt% Gd2O3 burnable poison

A technology of UO2 and content, applied in the field of TiO2-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: 2015-07-01
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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  • TiO2 doped UO2-10wt% Gd2O3 burnable poison and preparation method of TiO2 doped UO2-10wt% Gd2O3 burnable poison
  • TiO2 doped UO2-10wt% Gd2O3 burnable poison and preparation method of TiO2 doped UO2-10wt% Gd2O3 burnable poison
  • TiO2 doped UO2-10wt% Gd2O3 burnable poison and preparation method of TiO2 doped UO2-10wt% Gd2O3 burnable poison

Examples

Experimental program
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Effect test

Embodiment 1

[0049] In the first step, the nuclear-grade pure U 3 O 8 Drying at 350℃ for 2.5h, the purity of Gd is 99.9% 2 O 3 The powder was dried at 550°C for 2h. Press UO 2 -10wt%Gd 2 O 3 Combustible poison Gd 2 O 3 Take 89.95g UO respectively 2 Powder (89.95wt%), 10g Gd 2 O 3 The powder (10wt%) is put into the dissolution tank, and a certain amount of deionized water is added to it. Under the condition of rapid stirring, an appropriate amount of concentrated nitric acid is added to dissolve. After dissolving for 25 minutes, the insoluble matter is filtered out to form UO 2 (NO 3 ) 2 And Gd(NO 3 ) 3 The homogeneous mixed solution.

[0050] TiO 2 The mass ratio of the prepared combustible poison is (0.05)wt%. Weigh 0.22g of tetrabutyl titanate (TBT) into a beaker, add a certain amount of deionized water to it, and under rapid stirring conditions, After adding an appropriate amount of concentrated nitric acid to dissolve, a stable titanium sol solution is obtained. Under the condition of rap...

Embodiment 2

[0056] Use the same method as in Example 1 to prepare TiO 2 Doped UO 2 -10wt%Gd 2 O 3 Combustible poison, its difference from Example 1 is: TiO 2 The content of the combustible poison is 0.1wt%, corresponding to the weighed amount of tetrabutyl titanate is 0.45g, UO 2 The powder is 89.9 g (89.9 wt%).

[0057] The theoretical density of the above-prepared combustible poison is not less than 95% T.D, the crystal grain size is 15.5 μm, and the thermal conductivity is 0.054 W / (cm.° C.).

Embodiment 3

[0059] Use the same method as in Example 1 to prepare TiO 2 Doped UO 2 -10wt%Gd 2 O 3 Combustible poison, its difference from Example 1 is: TiO 2 The content of the combustible poison is 0.15wt%, corresponding to the weighed amount of tetrabutyl titanate is 0.67g, UO 2 The powder is 89.85g (89.85wt%).

[0060] The theoretical density of the above-prepared combustible poison is not less than 95% T.D, the crystal grain size is 15.6 μm, and the thermal conductivity is 0.055 W / (cm.° C.).

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Abstract

The invention discloses a TiO2 doped UO2-10wt% Gd2O3 burnable poison and a preparation method of the TiO2 doped UO2-10wt% Gd2O3 burnable poison. The TiO2 doped UO2-10wt% Gd2O3 is prepared from the following components by weight percent: 0-0.2wt% of TiO2, 10wt% of Gd2O3 and the balance being UO2. The invention also provides the preparation method of the burnable poison. According to the method, the process is simple, the cost is low, the prepared burnable poison has excellent grain size, sintered density and thermal conductivity; TiO2 is doped in the UO2-10wt% Gd2O3 burnable poison, and the burnable poison with increased concentration of gadolinium oxide still has good sintered density, grain size and thermal conductivity.

Description

Technical field [0001] The present invention belongs to the nuclear industry fuel field, and specifically relates to a TiO 2 Doped UO 2 -10wt%Gd 2 O 3 Combustible poison and its preparation method. Background technique [0002] UO is widely used in nuclear power reactors at home and abroad, especially in the core of PWR nuclear power plant 2 -Gd 2 O 3 Combustible toxic fuels control the initial reactivity of the reactor, flatten the power distribution of the core, increase fuel consumption, and extend the refueling cycle, thereby reducing nuclear power operating costs and improving operational safety and reliability. UO currently used in nuclear power plants 2 -Gd 2 O 3 Although the preparation method of combustible poison is similar to the commercial UO 2 The manufacturing process of pellets is similar, but UO 2 -Gd 2 O 3 The preparation of combustible poisons is much more difficult than UO 2 Pellets. Under the same sintering process conditions, gadolinium oxide (Gd 2 O 3 The ad...

Claims

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Application Information

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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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