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
CN110491531AActive Publication Date: 2019-11-22NUCLEAR POWER INSTITUTE OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NUCLEAR POWER INSTITUTE OF CHINA
Publication Date
2019-11-22

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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.
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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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