Relativistic correlated calculations of ...
Document type :
Communication dans un congrès avec actes
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]
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 PuO<sub>2</sub>, PuO<sub>3</sub> or PuO<sub>2</sub>(OH)<sub>2</sub>. Ourtheoretical study focusses on the thermodynamics properties of those molecules, in particular the former two species for which large experimental uncertainties remain.Show less >
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 PuO<sub>2</sub>, PuO<sub>3</sub> or PuO<sub>2</sub>(OH)<sub>2</sub>. 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 :
Source :