Title :

Relativistic correlated calculations of the thermodynamics properties of gaseous plutonium oxides

Author(s) :

Kervazo, Sophie [Orateur]
Physico-Chimie Moléculaire Théorique [PCMT]
Réal, Florent [Auteur]
Physico-Chimie Moléculaire Théorique [PCMT]
Virot, François [Auteur]
Laboratoire d'Etude du corium et du Transfert des radioélèments [IRSN/PSN-RES/SAG/LETR]
Severo Pereira Gomes, Andre [Auteur]
Physico-Chimie Moléculaire Théorique [PCMT]
Olejniczak, Małgorzata [Auteur]
Physico-Chimie Moléculaire Théorique [PCMT]
Ayers, Paul W. [Auteur]
Vallet, Valérie [Auteur]
Physico-Chimie Moléculaire Théorique [PCMT]

Conference title :

Quatrième réunion annuelle du GDR ThéMS

Conference organizers(s) :

Laboratoire PhLAM, UMR 8523 CNRS, Université de Lille

City :

Lille

Country :

France

Start date of the conference :

2016-12-14

Publication date :

2016-12-14

HAL domain(s) :

Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]

English abstract : [en]

The PUREX process has been designed for the reprocessing of spent nuclear fuel to separate uranium and plutonium from the fission products. Following the dissolution of the irradiated fuel in aqueous nitric acid, uranium ...
Show more >The PUREX process has been designed for the reprocessing of spent nuclear fuel to separate uranium and plutonium from the fission products. Following the dissolution of the irradiated fuel in aqueous nitric acid, uranium and plutonium are transferred to an organic phase by intensive mixing with an organic solvent extraction (tributyl phosphate in kerosene), while fission products remain in the aqueous nitric phase. The degradation products of TBP by hydrolysis can react with nitric acid through very exothermic chemical reactions that can lead to a rapid increase of temperature in the reprocessing vessels. In the worse cases, the in-cell solvent fire is considered to be an important postulated accident even if its probability is low. In such cases plutonium is released in volatile forms such as PuO₂, PuO₃ or PuO₂(OH)₂. Ourtheoretical study focusses on the thermodynamics properties of those molecules, in particular the former two species for which large experimental uncertainties remain.Show less >

Language :

Anglais

Peer reviewed article :

Non

Audience :

Nationale

Popular science :

Non

ANR Project :

Physiques et Chimie de l'Environnement Atmosphérique

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL