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Method for preparing simulated spent fuel

A technology for spent fuel and powder, applied in the field of preparing simulated spent fuel, can solve the problems of poor firing atmosphere, harsh preparation conditions, and high firing temperature, and achieve a safe firing atmosphere, low cost, and low firing temperature. Effect

Active Publication Date: 2019-02-22
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of harsh preparation conditions, high firing temperature, poor firing atmosphere, and high cost of the traditional simulated spent fuel preparation, based on the fact that the firing of organic matter in an inert or reducing atmosphere will generate a local high temperature and reducing atmosphere, so that the mixed The research idea that the metal oxides together are fully reduced under the condition of low external control temperature, the present invention aims to provide a simulated exhaust with mild preparation conditions, low firing temperature, safer firing atmosphere and low cost. fuel preparation method

Method used

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  • Method for preparing simulated spent fuel
  • Method for preparing simulated spent fuel
  • Method for preparing simulated spent fuel

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh 30 grams of uranium dioxide, weigh molybdenum trioxide, zirconium dioxide, neodymium trioxide, ruthenium dioxide, cerium dioxide, barium carbonate, palladium oxide, lanthanum trioxide, strontium oxide according to the ratio in Table 1 , diyttrium trioxide and dirhodium trioxide, and weigh the quantitative organic additive hexamethylenetetramine (containing amine-based organic matter), hexamethylenetetramine in uranium dioxide, simulated fission product metal oxide and organic The mass percentage in the sum of auxiliary agents is 7%. Put the above materials into the ball mill tank, and ball mill on the ball mill to make the materials fully mixed. Weigh 11 grams of the mixed material and put it into a cylindrical mold, press it at 300MPa, and maintain it for 10 minutes to obtain a cylindrical blank, place it in a high-temperature tube furnace, and feed 3% H 2 / Ar mixture, the temperature was gradually raised to 1640°C, and after 6 hours of calcination, it was natur...

Embodiment 2

[0024] Weigh 30 grams of uranium dioxide, weigh molybdenum trioxide, zirconium dioxide, neodymium trioxide, ruthenium dioxide, cerium dioxide, barium carbonate, palladium oxide, lanthanum trioxide, strontium oxide according to the ratio in Table 1 , yttrium trioxide and rhodium trioxide, and weigh the quantitative organic auxiliary agent hexamethylenetetramine, the mass percentage of hexamethylenetetramine in the sum of uranium dioxide, simulated fission product metal oxide and organic auxiliary agent 1%. Put the above materials into the ball mill tank, and ball mill on the ball mill to make the materials fully mixed. Weigh 11 grams of the mixed material and put it into a cylindrical mold, press it at 300MPa, and maintain it for 5 minutes to obtain a cylindrical blank, place it in a high-temperature tube furnace, and feed 4% H 2 / He mixture, the temperature was gradually raised to 1400°C, and after 8 hours of calcination, it was naturally lowered to room temperature to obtain...

Embodiment 3

[0027] Weigh 30 grams of uranium dioxide, weigh molybdenum trioxide, zirconium dioxide, neodymium trioxide, ruthenium dioxide, cerium dioxide, barium carbonate, palladium oxide, lanthanum trioxide, strontium oxide according to the ratio in Table 1 , diyttrium trioxide and dirhodium trioxide, and weigh the quantitative organic additive β-cyclodextrin (organic compound containing hydroxyl), the mass of β-cyclodextrin in the sum of uranium dioxide, simulated fission product metal oxide and organic additives The percentage is 5%. Put the above materials into the ball mill tank, and ball mill on the ball mill to make the materials fully mixed. Weigh 11 grams of the mixed material and put it into a cylindrical mold, press it at 150MPa, and keep it for 12 minutes to obtain a cylindrical billet, place it in a high-temperature tube furnace, feed 2% CO / He mixed gas, and gradually heat up to 1600 °C, after 4 hours of calcination, it naturally dropped to room temperature, and the simulat...

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Abstract

The invention provides a method for preparing simulated spent fuel and belongs to the technical field of preparation of nuclear materials. The method comprises the following steps: carrying out sufficient ball milling and mixing on uranium dioxide, a simulated cracking product metal oxide and an organic auxiliary agent on a ball milling machine according to a certain ratio; then carrying out high-pressure pressing and molding; and finally, sintering in a high-temperature atmosphere to obtain the simulated spent fuel. The organic auxiliary agent comprises a hydroxyl-containing organic matter, an amino-containing organic matter, organic acid or an ester type organic matter; the mass percent of the organic auxiliary agent in the total sum of the uranium dioxide, the simulated cracking productmetal oxide and the organic auxiliary agent is 1 to 10 percent; and the sintering temperature is as relatively low as 1400 to 1640 DEG C. The method has moderate conditions and has the advantages oflow sintering temperature, no need of hydrogen gas or relatively low hydrogen concentration; and a sintering atmosphere is safer (the hydrogen gas is not needed or less hydrogen gas is used). Comparedwith traditional simulated spent fuel, the simulated spent fuel prepared by the method according to gentle preparation technology conditions has low cost and better economical efficiency.

Description

technical field [0001] The invention relates to a method for preparing simulated spent fuel, which belongs to the technical field of nuclear material preparation. Background technique [0002] Nuclear power is not only a clean and efficient energy source, but also has the characteristics of large capacity, relatively mature technology, low cost, and small transportation volume. Therefore, nuclear power has received more and more strategic attention from many countries. my country has raised the tone of nuclear power development from "actively developing nuclear power" to "safe and efficient development of nuclear power" and "developing nuclear power under the premise of ensuring safety". However, the safe and efficient development of nuclear ionization is inseparable from the nuclear fuel cycle including advanced spent fuel reprocessing technology. Spent fuel refers to the nuclear fuel in the nuclear fuel assembly that is not used in the reactor is removed from the reactor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/00
CPCG21C21/00Y02E30/30
Inventor 王来军刘哲陆跃翔周桐赵园辛甜吕宇翔陈靖
Owner TSINGHUA UNIV