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Zirconium matrix removing process and burnup measuring method adopting same

A measurement method and matrix technology, applied in nuclear engineering, greenhouse gas reduction, nuclear reactor monitoring, etc., can solve problems such as data deviation from the true value, burnup measurement failure, and affect the separation effect of uranium and burnup monitoring body, etc., to achieve wide application and promotional value effects

Active Publication Date: 2019-11-22
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a zirconium matrix removal process and a burnup measurement method using the process, so as to solve the problem that a large amount of zirconium matrix in the nuclear fuel solution makes the liquid phase The separation column of the chromatogram is saturated, which seriously affects the separation effect of uranium and the burnup monitor in the subsequent separation process of the uranium and the burnup monitor, which leads to the failure of the burnup measurement or the deviation of the data from the true value

Method used

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  • Zirconium matrix removing process and burnup measuring method adopting same
  • Zirconium matrix removing process and burnup measuring method adopting same
  • Zirconium matrix removing process and burnup measuring method adopting same

Examples

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Effect test

Embodiment 1

[0065] Such as figure 2 The burnup measurement method using the zirconium matrix removal process shown includes the steps of sample cutting and fractionation, sample dissolution step, hydrofluoric acid removal step, uranium and burnup monitoring body separation step, and uranium and burnup monitoring body content determination step ; Also includes a zirconium matrix removal step, the zirconium matrix removal step is located between the hydrofluoric acid removal step and the uranium, burnup monitoring body separation step; the solution obtained through the zirconium matrix removal step can be directly used for uranium, burnup monitoring body separation step.

[0066] Through the zirconium matrix removal process, the burnup measurement process provided by the present invention can remove a large amount of zirconium matrix in the solution after the hydrofluoric acid removal step, so that the zirconium content in the solution is lower than the subsequent separation steps of urani...

Embodiment 2

[0068] On the basis of Example 1, the step of removing the zirconium matrix comprises the following steps:

[0069] (A) adjustment of the solution system, adjusting the solution Y1 obtained in the hydrofluoric acid removal step to obtain the solution Y2 of the zirconium matrix to be removed;

[0070] (B) Extracting the zirconium matrix in the solution Y2 with an extractant solution to obtain a solution Y3.

[0071] Wherein, described step (A) comprises the following steps:

[0072] (A1) Precipitating metal ions, adding ammonia water to the solution Y1, and precipitating the metal ions in the solution Y1;

[0073] (A2) filtering the solution Y1 to obtain the metal ion precipitate generated in the step (A1);

[0074] (A3) The precipitate is dissolved, and the precipitate obtained by filtering in the step (A2) is dissolved with nitric acid to obtain a solution Y2.

[0075] Since the solution obtained after the hydrofluoric acid removal step is a mixed acid system of nitric acid ...

Embodiment 3

[0081] On the basis of embodiment 2, step (B) comprises the following steps:

[0082] (B1) placing the extractant solution and the solution Y2 together in a reaction vessel, stirring and extracting the zirconium matrix in the solution Y2;

[0083] (B2) Stand still, discard the upper organic phase, and the lower aqueous phase is the solution Y3, which can be directly used in the separation step of uranium and burnup monitoring body.

[0084] Wherein, in step (B1), the extraction temperature is 20-30° C., and the extraction time is 10-30 min.

[0085] After the extraction and stirring, take out the reaction vessel from the water bath environment and let it stand for 2 to 5 minutes, then discard the upper organic phase, which contains the zirconium matrix; the lower aqueous phase is the solution Y3, which has a low zirconium content It is less than 0.1g / L, so it can be directly used in the separation process of uranium and burnup monitoring body for subsequent burnup measurement...

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Abstract

The invention discloses a zirconium matrix removal process and a burnup measurement method adopting the process. The burnup measurement method comprises a sample cutting and separating step, a sampledissolving step, a hydrofluoric acid removal step, a uranium and burnup monitoring body separation step and a uranium and burnup monitoring body content measurement step. The method further comprisesa zirconium matrix removing step, and the zirconium matrix removing step is located between the hydrofluoric acid removing step and the uranium and fuel consumption monitoring body separating step. Asolution obtained by the zirconium matrix removing step can be directly used in the uranium and burnup monitoring body separation step. Through the zirconium matrix removal process, in the burnup measuring method, a large number of zirconium matrixes in the dissolving solution can be removed after the hydrofluoric acid removal step; and the content of zirconium in the dissolving solution is lowerthan the requirement of the subsequent uranium and burnup monitoring body separation step, so that the burnup measurement process can accurately measure the burnup value of a special system, namely azirconium-based dispersive nuclear fuel element, and has wide application and popularization values.

Description

technical field [0001] The invention relates to a method for measuring the burnup of a fuel element, in particular to a process for removing a zirconium matrix and a method for measuring the burnup using the process. Background technique [0002] Burnup is an indicator of the degree of consumption of fissile nuclides after the chain fission reaction of nuclear fuel elements in the reactor, and an indicative parameter of the degree of nuclear fuel irradiation and the size of energy release. As one of the most important performance indicators of nuclear fuel elements, the accuracy of burnup measurement is of great significance to the development of new nuclear fuel elements and the determination of refueling intervals. [0003] The burnup measurement of nuclear fuel elements usually includes the monitor volume method and the heavy isotope measurement method. The related isotope abundance or activity is measured by isotope mass spectrometry or energy spectroscopy, and the burnu...

Claims

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Application Information

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IPC IPC(8): G21C17/10
CPCG21C17/10Y02E30/30
Inventor 苏冬萍梁帮宏陈云明张劲松李兵李顺涛孙鹏冯伟伟
Owner NUCLEAR POWER INSTITUTE OF CHINA
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