TY - JOUR
T1 - Pore pressure estimation in irradiated UMo
AU - Salvato, Daniele
AU - Leenaers, Ann
AU - Van den Berghe, Sven
AU - Detavernier, Christophe
N1 - Score=10
PY - 2018/8/22
Y1 - 2018/8/22
N2 - Image analysis was performed on SEM micrographs of recently irradiated UMo dispersion fuel plates. Detailed information on the fission gas inter-granular bubbles accompanying recrystallization, including average diameter, density and size distribution were extracted and compared with previous results on UMo and UO2. A pore density drop was notice at high fission densities and attributed mainly to a pore coarsening dominated by irradiation induced phenomena. Based on the image analysis data and theoretical considerations, a model was developed to estimate the pressure inside the pores as a function of fission density, temperature and pore radius. The developed pressure can give indications of the mechanical
stability of the fuel towards the progressive building-up of fission gases. Finally, the proposed methodology was applied to the nanobubble lattice decorating the fuel grains at low fission densities in order to infer the physical state of the contained fission gases. The estimated values suggest the presence of solid xenon precipitates.
AB - Image analysis was performed on SEM micrographs of recently irradiated UMo dispersion fuel plates. Detailed information on the fission gas inter-granular bubbles accompanying recrystallization, including average diameter, density and size distribution were extracted and compared with previous results on UMo and UO2. A pore density drop was notice at high fission densities and attributed mainly to a pore coarsening dominated by irradiation induced phenomena. Based on the image analysis data and theoretical considerations, a model was developed to estimate the pressure inside the pores as a function of fission density, temperature and pore radius. The developed pressure can give indications of the mechanical
stability of the fuel towards the progressive building-up of fission gases. Finally, the proposed methodology was applied to the nanobubble lattice decorating the fuel grains at low fission densities in order to infer the physical state of the contained fission gases. The estimated values suggest the presence of solid xenon precipitates.
KW - uranium
KW - molybdenum
KW - recrystallization
KW - fission gas
KW - pressure
KW - nanobubble lattice
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/31325886
U2 - 10.1016/j.jnucmat.2018.08.039
DO - 10.1016/j.jnucmat.2018.08.039
M3 - Article
SN - 0022-3115
VL - 510
SP - 472
EP - 483
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -