Chemical Separation Process for Burnup Analysis of Spent Fuel Elements

Abstract

The invention relates to a chemical separation procedure for burnup analysis of a spent fuel element. The chemical separation procedure comprises the following steps of: (I) dissolving a spent fuel element block, namely putting the spent fuel element block into concentrated nitric acid and concentrated hydrochloric acid mixed liquid with the volume ratio of 3:1 to make the spent fuel element block be completely dissolved, and cooling the dissolving liquid to room temperature; (II) diluting the dissolving liquid, namely mixing the dissolving liquid cooled in the step (I) and nitric acid, uniformly stirring the dissolving liquid and the nitric acid to obtain diluted dissolving liquid; and (III) separating uranium, plutonium, molybdenum and neodymium by a column chromatography method through the diluted dissolving liquid obtained in the step (II). The invention establishes a novel chemical separation procedure for measuring the burnup of the spent fuel element; according to the chemical separation procedure, some novel levextrel, ion exchange material and high performance liquid chromatography technologies are adopted, so that chemical separation of the uranium, the plutonium, the molybdenum and the neodymium is realized; the operation procedure is greatly simplified; the operation difficulty is reduced; and the radiation to researchers is reduced.

Description

technical field [0001] The invention belongs to the technical field of burnup measurement of spent fuel elements, and in particular relates to a chemical separation process for burnup analysis of spent fuel elements. Background technique [0002] The radiochemical analysis of spent fuel element burnup is the most accurate method recognized internationally. Both nuclear submarines and new nuclear reactors need to undergo component testing. Usually, in order to obtain the spatial burnup distribution of the core and understand the axial and radial burnup distribution of a single component in detail and accurately, the destructive analysis of components is very necessary. In the 1970s, my country started research on fuel consumption measurement methods. The fuel consumption measurement group developed an analysis method for this purpose, successively accurately measured the fuel consumption of 08 and 09 components, and the fuel consumption of 728 test components. Guarantees were...

AI Technical Summary

Problems solved by technology

However, the established method for the determination of fuel consumption and radiochemistry has problems such as many technical links, cumbersome separation procedures, and large doses for researchers.

For example, more than 30 people are usually required to participate in a burnup measurement, and the radioactive intensity of the operation reaches hundreds of curies, and the time used reaches tens of days. Such a long-term operation cannot meet the needs of today’s large-scale sample analysis.