Work

Evidence of two different kinetics for gas release out of a UO2 fuel submitted to a temperature ramp

Year: 2026

Type: article

Abstract: Fission gas release might play a role in the fragmentation of nuclear fuel during a Loss of Coolant Accident. Using MERARG facility, we studied the kinetics of fission gas release during the heat treatment of several segments taken out of a fuel rod irradiated 6 cycles in a commercial reactor up to an average burn-up of 67 GWd/tU. The samples exhibited the same gas release with one burst release at around 700°C and another one at around 1200°C. We then studied gas release in isothermal conditions, by imposing a temperature plateau when gas burst was near its maximum. Two different kinetics for gas release were observed: the one during the plateau at 700°C is much faster than the other during the plateau at 1200°C.

Source: Journal of Nuclear Materials

DOI: 10.1016/j.jnucmat.2026.156911

Authors: J. Losfeld, M. Pontillon, J.-C. Richaud, F. Fiorito, S. Clément, Y. Pontillon, L. Desgranges, G. Baldinozzi

Institutions: Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Cadarache, Institut de Recherche sur les Systèmes Nucléaires pour la production d'Energie bas carbone, Centre National de la Recherche Scientifique, CentraleSupélec

Language: English

Topic: Nuclear Materials and Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,640

OpenAlex ID: W7169517380

FWCI:

Cites: 13

Cited by:

Related to: 10