Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Areva Nc

Orano Cycle

Compagnie Generale Des Matieres Nucleaires

Areva Mines

Gilles Bernier

Stéphane Pellet-Rostaing

Pascal Baron

Christian Sorel

Binh Dinh

Xavier Heres

Marc Lemaire

Manuel Miguirditchian

Fabien Burdet

Alain Favre-Reguillon

Elisabeth Zekri

Patrick Pochon

Jacques Foos

Guilhem Arrachart

Antoine Leydier

Marinella Mazzanti

Michael Lecomte

Raphael Turgis

Julien Borrini

Jean-Marc Adnet

Marie-Thérèse Duchesne

Philippe Moisy

Coralie Balaguer

Estelle Ameil

Nicolas Aychet

Gabriel Plancque

Clément Hill

Danièle Sans

Laurent Venault

Marc Montuir

Gérard Le Buzit

Antoine Sorin

Michaël Lecomte

Stephane Pellet-Rostaing

The use of hydroxyiminoalkanoic acids including at least four carbon atoms as anti-nitrous agents in operations of reductive stripping of plutonium. The invention may be useful in any method for processing spent nuclear fuels that includes one or more operations of reductive stripping of plutonium and, more particularly, in the PUREX method as implemented in modern nuclear fuel processing plants, as well as in processes derived therefrom.

Use of hydroxyiminoalkanoic acids as anti-nitrous agents in operations of reductive stripping of plutonium

A method for processing a spent nuclear fuel is disclosed which includes a step for decontaminating uranium(VI) from one or more actinides(IV) and more specially from neptunium and/or plutonium, by complexing this (these) actinide(s)(IV). This method includes a step for decontaminating uranium (VI) from at least one actinide(IV), which decontaminating step comprises at least one operation for stripping the actinide(IV) from an organic phase, not miscible with water, and wherein uranium(VI) and the actinide(IV) are present, by putting the organic phase into contact with an aqueous phase comprising nitric acid and at least one complexing agent which more strongly complexes actinides(IV) than uranium(VI), and then separating the organic phase from the nitric aqueous phase, wherein the at least one complexing agent is a diglycolamide.

Method for processing spent nuclear fuel comprising a step for decontaminating uranium (VI) from at least one actinide (IV) by complexing this actinide (IV)

New compounds which meet general formula (I): where:

Bifunctional compounds useful as ligands of uranium (VI), methods of synthesising same and uses thereof

A process which allows separation of americium present in an acid aqueous phase or in an organic phase from the other metal elements also found in this phase, by complexation of the americium with a water-soluble ethylenediamine derivative; and a process for selective recovery of americium from an acid aqueous phase containing, in addition to americium, other metal elements, which comprises the application of this separation process.

Process for separating americium from other metallic elements present in an acidic aqueous or organic phase

A method with which americium may be selectively recovered from a nitric aqueous phase containing americium, curium and fission products including lanthanides and yttrium, but which is free of uranium, plutonium and neptunium or which only contains these three last elements in trace amounts. The method is applicable for treatment and recycling of irradiated nuclear fuels, in particular for removing americium from raffinates stemming from methods for extracting and purifying uranium and plutonium such as the PUREX and COEX&#x2122; methods.

Method for selectively recovering americium from a nitric aqueous phase

The invention relates to the use of butyraldehyde oxime as an anti-nitrous agent in a plutonium stripping operation based on a reduction of this element from oxidation state (IV) to oxidation state (III). Applications: any nuclear fuel reprocessing process in which employing a compound that has the twofold property of being extractable into an organic phase and of being capable of destroying the nitrous acid therein may be useful and especially any process including one or more operations for the reductive stripping of plutonium.

Use of butyraldehyde oxime as an anti-nitrous agent in an operation for the reductive stripping of plutonium

The invention relates to a process for separating, in an aqueous medium, at least one actinide element from one or more lanthanide elements by using at least one molecule which sequesters the said actinide element to be separated and membrane filtration, the said process successively comprising:

Process for separating at least one actinide element from lanthanide elements in an aqueous medium by sequestration and membrane filtration

The invention relates to a method for separating uranium(VI) from one or more actinides selected from actinides(IV) and actinides(VI) other than uranium(VI), characterized in that it comprises the following steps: a) bringing an organic phase, which is immiscible with water and contains the said uranium and the said actinide or actinides, in contact with an aqueous acidic solution containing at least one lacunary heteropolyanion and, if the said actinide or at least one of the said actinides is an actinide(VI), a reducing agent capable of selectively reducing this actinide(VI); and b) separating the said organic phase from the said aqueous solution. Applications: reprocessing irradiated nuclear fuels, processing rare-earth, thorium and/or uranium ores.

Method for separating uranium (VI) from actinides(IV) and/or actinides (VI) and its uses

Growing community of inventors

Avignon, France

Gilles Bernier