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A device and method for adjusting the valence states of neptunium and plutonium in a hot chamber

A technology of valence state and inner cylinder, which is applied to the device of plutonium valence state and adjusts the field of neptunium, can solve the problems of uncertainty and potential safety hazards, and achieve the effect of reliable performance, long service life and convenient operation of the manipulator.

Active Publication Date: 2022-07-01
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hot cell is a place with strong radioactivity and strong corrosiveness, and the price adjustment experiment process usually uses a simple container for the above operations, which has certain safety hazards and uncertainties. Therefore, it is necessary to design a suitable for radioactive and strong corrosive places. Price adjustment device, and can monitor the valence state of target substance ions in the reactor in time, so as to have real-time monitoring and control of the price adjustment reaction process

Method used

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  • A device and method for adjusting the valence states of neptunium and plutonium in a hot chamber
  • A device and method for adjusting the valence states of neptunium and plutonium in a hot chamber
  • A device and method for adjusting the valence states of neptunium and plutonium in a hot chamber

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Embodiment 1

[0062] Take a certain volume of Pu-containing feed solution, in which the concentration of the reducing agent is 0.1-0.3 mol / L. With the above-mentioned price adjustment device, the Pu is adjusted to tetravalent, the concentration of nitric acid is adjusted to 2-3 mol / L, and the nitrous acid in the feed liquid is lower than 5 mmol / L.

[0063] N for experiment 2 O 4 Adjust the ion valence state by bubbling, the reaction process is stable, there is no bumping and spraying state, the temperature of the material liquid during the seasoning process does not exceed 50 °C, and the ion valence state in the material liquid and the content of reducing agent and nitric acid are tested respectively during the price adjustment process and after the price adjustment. concentration, all meet the requirements of the next process.

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Abstract

The invention discloses a device for adjusting the valence states of neptunium and plutonium in a hot chamber. The device comprises an inner cylinder, a clamping sleeve, a sample introduction system, a material discharge system, an online sample analysis system, a seasoning bubbling system, and a liquid level measurement system. systems, temperature measurement systems, pressure measurement systems. The device provided by the invention is suitable for use in radioactive and highly corrosive places, and can directly measure the light absorption value of the sample in the hot chamber, and use the spectral absorption peaks of different substances to judge the ion valence state and other information in the material liquid.

Description

technical field [0001] The invention relates to the field of spent fuel reprocessing, in particular to a device and method for adjusting the valence states of neptunium and plutonium in a hot chamber. Background technique [0002] Nuclear fuel water post-processing is the process of treating irradiated nuclear fuel by chemical separation methods such as precipitation, solvent extraction, ion exchange, etc. in an aqueous solution. It is a common method in nuclear fuel post-processing, and generally includes the following three steps. The first step is to remove the outer shell of the fuel element by mechanical or chemical methods, and dissolve the element core (metal or oxide) in nitric acid. This step is called head-end treatment; for stainless steel or zirconium alloy clad fuel elements, it is The cutting-leaching method is adopted, that is, the components are cut into small pieces, and then the core body is leached with nitric acid without dissolving the outer shell. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C19/46G21C17/06G21G5/00
CPCG21C19/46G21C17/06G21G5/00Y02W30/50
Inventor 李峰峰何辉唐洪彬叶国安蒋德祥刘金平刘占元李斌申震常尚文郭建华刘聪刘协春周贤明
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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