Compaction of a bed of fragmentable particles and associated acoustic emission

Authors:

Hégron, Lise, Sornay, Philippe, Favretto-Cristini, Nathalie

Contributors:

Laboratoire de Mécanique et d'Acoustique Marseille (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Laboratoire des Combustibles Uranium (LCU), Service d'Analyses, d'Elaboration, d'Expérientations et d'Examens des combustibles (SA3E), Département d'Etudes des Combustibles (DEC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département d'Etudes des Combustibles (DEC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), MISTRAL-Lab + 9

Published in:

ISSN: 0018-9499

Publisher:

HAL CCSD, Institute of Electrical and Electronics Engineers

Abstract

International audience ; The nuclear fuel of light water power reactors ismanufactured by powder metallurgy. This method is also used for the production of fuels containingminor actinides which have high activity and long life. Given their radiotoxicity, maximum simplification in the manufacturing process is necessary in order to limit dissemination and retention of matter. In addition to this, the fuel must have a mostly open porosity. Implementation of particles of a few hundred micrometers and controlled cohesion could achieve this dual objective. However, the mechanical strength of compacts before sinteringmust be sufficient without adding binder. The phenomena which occur during the manufacturing of compacts are thus analyzed and quantified.We show that only a part of the particles breaks upon application of a stress of up to 600 MPa and it is possible to detect this fragmentation by acoustic emission (AE).