Titre :

Chemical interaction between uranium dioxide, boron carbide and stainless steel at 1900 °C — Application to a severe accident scenario in sodium cooled fast reactors

Auteur(s) :

Garrigue, Mathieu [Auteur]
Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
419361|||Université Paris-Saclay
Quaini, Andrea [Auteur]
Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
419361|||Université Paris-Saclay
Alpettaz, Thierry [Auteur]
Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
419361|||Université Paris-Saclay
Bonnet, Christophe [Auteur]
Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
419361|||Université Paris-Saclay
Brackx, Emmanuelle [Auteur]
Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
Université de Montpellier [UM]
Touzin, Matthieu [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Tougait, Olivier [Auteur]
Unité de Catalyse et de Chimie du Solide (UCCS) - UMR 8181
Unité Matériaux et Transformations - UMR 8207 [UMET]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Guéneau, Christine [Auteur]
Commissariat à l'énergie atomique et aux énergies alternatives [CEA]
Université Paris-Saclay

Titre de la revue :

Journal of Nuclear Materials

Numéro :

557

Pagination :

153266

Éditeur :

Elsevier BV

Date de publication :

2021-12-15

ISSN :

0022-3115

Mot(s)-clé(s) en anglais :

Severe accident
Sodium fast reactor
B4C
Carbo-reduction
UO2
Stainless steel

Discipline(s) HAL :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Chimie/Matériaux

Résumé en anglais : [en]

For the understanding of severe accidents in sodium cooled fast reactors (SFR), it is necessary to understand two prototypic accident scenarios such as ULOF (Unprotected Loss of Flow Accident) and UTOP (Unprotected Transient ...
Lire la suite >For the understanding of severe accidents in sodium cooled fast reactors (SFR), it is necessary to understand two prototypic accident scenarios such as ULOF (Unprotected Loss of Flow Accident) and UTOP (Unprotected Transient OverPower). As the base knowledge, it is also important to understand high temperature chemical interaction among major core materials such as MOx fuel (MOx: mixed oxide of uranium and plutonium), steel cladding and B4C neutron absorber have to be investigated. This study aims at providing experimental data on phase formation and phase-stability at various temperature and pressure conditions. A first series of samples containing a mixture of B4C and steel were prepared to obtain a homogenous metallic solid. In a second step, these metallic samples were mixed and melted with small UO2 pieces by arc melting. Then these samples underwent a heat treatment at 1900 °C for 1 hour. EDS, EBSD and EPMA analyses were performed to identify the phases formed during the solidification. In addition, thermodynamic calculations were performed for the interpretation of the results, revealing that a carbo-reduction reaction occurs: UO2 + 2 C = 2 CO + U. A significant amount of uranium from the fuel is dissolved in the metallic liquid phase, leading to the formation of mixed borides (UM3B2, UMB4, UM4B, M=Fe,Cr,Ni). In comparison with the UO2/steel interaction, the present results show that the presence of B and C in the melt improves the wetting behaviour of the metallic liquid towards UO2.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Métallurgie Physique et Génie des Matériaux

Date de dépôt :

2021-09-06T07:23:18Z
2021-09-07T09:14:22Z