PROCEDE ET DISPOSITIF DE REDUCTION DU DEGAZAGE DE DECHETS TRITIES ISSUS DE L'INDUSTRIE NUCLEAIRE

摘要

The method comprises contacting a package including a tritiated waste (5) with a mixture (2) including manganese dioxide and silver compound, and contacting the package with a molecular sieve (1). A mass concentration of the manganese dioxide in the mixture is 89.3%. A mass oxide concentration of the silver compound in the mixture is 10.2%. The mass concentrations for manganese dioxide and silver oxide in the mixture are 10-90%. The package is presented in a form of a barrel (10) having a bottom (12) and containing the waste. The mixture is partly placed on a flexible support to form a cover. The method comprises contacting a package including a tritiated waste (5) with a mixture (2) including manganese dioxide and silver compound, and contacting the package with a molecular sieve (1). A mass concentration of the manganese dioxide in the mixture is 89.3%. A mass oxide concentration of the silver compound in the mixture is 10.2%. The mass concentrations for manganese dioxide and silver oxide in the mixture are 10-90%. The package is presented in a form of a barrel (10) having a bottom (12) and containing the tritiated waste. The mixture is partly placed on a flexible support to form a cover. The method further comprises: preparing the mixture by mixing the manganese dioxide with the silver compound prior to the step of contacting the package with the mixture; depositing the mixture on the molecular sieve prior to the contacting steps; placing the molecular sieve on which the mixture is deposited, inside the barrel; providing the mixture within the waste or on the waste; and enveloping a part of the package by the cover. The depositing step is accompanied by a mechanical step of fixing of the mixture on the molecular sieve and by a chemical step of fixing of the mixture on the molecular sieve using an additive. The flexible support is a mesh wire. The preparation step comprises mixing the manganese dioxide powder with the silver oxide powder, and adding water to the mixed powders, or dispersing a saline solution including of silver ions in the manganese dioxide in a solid state, or immersing the manganese dioxide in a solution comprising a salt of silver in a solid state and depositing the silver on the manganese dioxide by precipitation of the solution including of silver. An independent claim is included for a device for reducing the quantity of tritiated hydrogen and/or tritiated water in a package.