The initial formation stages of a nanobubble lattice in neutron irradiated U(Mo)

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The initial formation stages of a nanobubble lattice in neutron irradiated U(Mo). / Salvato, Daniele; Leenaers, Ann; Van Renterghem, Wouter; Van den Berghe, Sven.

In: Journal of Nuclear Materials, Vol. 529, 151947, 10.12.2019, p. 1-13.

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@article{4e8f463baa664ec4b1bf1afb3f4609c9,
title = "The initial formation stages of a nanobubble lattice in neutron irradiated U(Mo)",
abstract = "Low burnup samples of U7wt{\%}Mo with 10{\%}, 15{\%}, 20{\%} and 25{\%} 235U burnup were analysed by transmission electron microscopy in order to study the formation mechanism of the fission gas nanobubble lattice. The analysis showed that the bubble lattice formation starts at a burnup lower than 10{\%}, preferentially at grain boundaries before extending towards the grain interior with increasing irradiation dose. The bubble lattice geometrical characteristics and degree of ordering seem to be independent of the fuel fission density. Pressure calculations indicate that bubbles are extremely underpressurized in the four samples analysed, thus suggesting a void-like nature of the cavities in their first stages of alignment. Finally, the first signs of bubble lattice disruption are observed at the grain boundaries when approaching 20{\%} burnup due to the fuel recrystallization. The presented results provide further insights into the development of the fission gas nanobubble lattice in irradiated U(Mo).",
keywords = "Metallic fuel, UMo, Low Burnup, Transmission Electron Microscopy, nanobubble lattice, Fission gas",
author = "Daniele Salvato and Ann Leenaers and {Van Renterghem}, Wouter and {Van den Berghe}, Sven",
note = "Score=10",
year = "2019",
month = "12",
day = "10",
doi = "10.1016/j.jnucmat.2019.151947",
language = "English",
volume = "529",
pages = "1--13",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

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TY - JOUR

T1 - The initial formation stages of a nanobubble lattice in neutron irradiated U(Mo)

AU - Salvato, Daniele

AU - Leenaers, Ann

AU - Van Renterghem, Wouter

AU - Van den Berghe, Sven

N1 - Score=10

PY - 2019/12/10

Y1 - 2019/12/10

N2 - Low burnup samples of U7wt%Mo with 10%, 15%, 20% and 25% 235U burnup were analysed by transmission electron microscopy in order to study the formation mechanism of the fission gas nanobubble lattice. The analysis showed that the bubble lattice formation starts at a burnup lower than 10%, preferentially at grain boundaries before extending towards the grain interior with increasing irradiation dose. The bubble lattice geometrical characteristics and degree of ordering seem to be independent of the fuel fission density. Pressure calculations indicate that bubbles are extremely underpressurized in the four samples analysed, thus suggesting a void-like nature of the cavities in their first stages of alignment. Finally, the first signs of bubble lattice disruption are observed at the grain boundaries when approaching 20% burnup due to the fuel recrystallization. The presented results provide further insights into the development of the fission gas nanobubble lattice in irradiated U(Mo).

AB - Low burnup samples of U7wt%Mo with 10%, 15%, 20% and 25% 235U burnup were analysed by transmission electron microscopy in order to study the formation mechanism of the fission gas nanobubble lattice. The analysis showed that the bubble lattice formation starts at a burnup lower than 10%, preferentially at grain boundaries before extending towards the grain interior with increasing irradiation dose. The bubble lattice geometrical characteristics and degree of ordering seem to be independent of the fuel fission density. Pressure calculations indicate that bubbles are extremely underpressurized in the four samples analysed, thus suggesting a void-like nature of the cavities in their first stages of alignment. Finally, the first signs of bubble lattice disruption are observed at the grain boundaries when approaching 20% burnup due to the fuel recrystallization. The presented results provide further insights into the development of the fission gas nanobubble lattice in irradiated U(Mo).

KW - Metallic fuel

KW - UMo

KW - Low Burnup

KW - Transmission Electron Microscopy

KW - nanobubble lattice

KW - Fission gas

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/36548528

U2 - 10.1016/j.jnucmat.2019.151947

DO - 10.1016/j.jnucmat.2019.151947

M3 - Article

VL - 529

SP - 1

EP - 13

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

M1 - 151947

ER -

ID: 5874513