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Device and method for adjusting valence states of neptunium and plutonium in 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: 2020-09-08
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Device and method for adjusting valence states of neptunium and plutonium in hot chamber
  • Device and method for adjusting valence states of neptunium and plutonium in hot chamber
  • Device and method for adjusting valence states of neptunium and plutonium in hot chamber

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Embodiment 1

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

[0063] Experimental use N 2 o 4 The valence state of ions is adjusted by bubbling, the reaction process is stable, there is no bumping and spraying state, the temperature of the liquid during the seasoning process does not exceed 50°C, and the valence state of the ions in the liquid and the content of the reducing agent and nitric acid are tested respectively during the price adjustment process and after the end of the price adjustment Concentrations are in line with the requirements of the next step process.

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Abstract

The invention discloses a device for adjusting valence states of neptunium and plutonium in a hot chamber. The device comprises an inner cylinder, a jacket cylinder, a sample feeding system, a discharging system, a sample online analysis system, a seasoning bubbling system, a liquid level measurement system, a temperature measurement system and a pressure measurement system. The device provided bythe invention is suitable for radioactive and strong corrosive places, can directly measure the light absorption value of a sample in the hot chamber, and utilizes the spectral absorption peaks of different substances to judge the ion valence state and other information in the feed 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] Aqueous nuclear fuel reprocessing is the process of treating irradiated nuclear fuel with chemical separation methods such as precipitation, solvent extraction, ion exchange, etc. in aqueous solution. It is a common method in nuclear fuel reprocessing, generally including the following three steps: The first step is to remove the shell of the fuel element by mechanical or chemical method, and dissolve the element core (metal or oxide) in nitric acid. This step is called head-end treatment; for stainless steel or zirconium alloy cladding fuel elements, then The cutting-leaching method is adopted, that is, the element is cut into small pieces, and then the core is leached with nitric acid without dissolving the shell. The second step is that the sol...

Claims

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Application Information

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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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