Peer-reviewedCC BY-NC 4.0Journal of Nuclear Materials
Evidence of two different kinetics for gas release out of a UO2 fuel submitted to a temperature ramp
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.
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BibTeX
@article{losfeld2026evidence,
title = {{Evidence of two different kinetics for gas release out of a UO2 fuel submitted to a temperature ramp}},
author = {J. Losfeld and M. Pontillon and J-C Richaud and F. Fiorito and S. Clément and Yves Pontillon and L. Desgranges and Gianguido Baldinozzi},
journal = {Journal of Nuclear Materials},
year = {2026},
month = jul,
doi = {10.1016/j.jnucmat.2026.156911},
url = {https://hal.science/hal-05697969v1},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Evidence of two different kinetics for gas release out of a UO2 fuel submitted to a temperature ramp
AU - J. Losfeld
AU - M. Pontillon
AU - J-C Richaud
AU - F. Fiorito
AU - S. Clément
AU - Yves Pontillon
AU - L. Desgranges
AU - Gianguido Baldinozzi
PY - 2026
DA - 2026/07/17
JO - Journal of Nuclear Materials
DO - 10.1016/j.jnucmat.2026.156911
UR - https://hal.science/hal-05697969v1
AB - 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.
SN - 0022-3115
SN - 1873-4820
ER -