TY - JOUR
T1 - Effects of recrystallization on fission gas behavior in U3Si2 fuel at LWR temperature
T2 - A combination of phase-field method and rate theory
AU - Ge, Zhenhong
AU - Liu, Xuxi
AU - Jiang, Yanbo
AU - Liu, Wenbo
AU - Yun, Di
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/4/15
Y1 - 2025/4/15
N2 - The not well-known fission gas behavior of U3Si2 under light water reactor (LWR) conditions is a key limitation for its application as accident tolerant fuel (ATF) in commercial LWRs. In this paper, we developed a rate theory calculation model based on the kinetic rate theory framework originally developed in the GRASS-SST code, modified by the phase-field method, to investigate the influence of grain size on fission gas behavior in U3Si2 fuel under LWR conditions. The phase=field model examines microstructural development, specifically, evolution in grain size, in U3Si2 fuel. This model is then incorporated into the rate theory framework to analyze fission gas release and the retained fission gas bubble areal fraction during irradiation. The integration of these mesoscale models enhances our understanding of the impact of grain size evolution on fission gas behavior. The simulations of fission gas release show good agreement with post-irradiation examination (PIE) data, providing validation to the model and insights into the varying retained fission gas behavior observed in different regions of irradiated fuel pellet.
AB - The not well-known fission gas behavior of U3Si2 under light water reactor (LWR) conditions is a key limitation for its application as accident tolerant fuel (ATF) in commercial LWRs. In this paper, we developed a rate theory calculation model based on the kinetic rate theory framework originally developed in the GRASS-SST code, modified by the phase-field method, to investigate the influence of grain size on fission gas behavior in U3Si2 fuel under LWR conditions. The phase=field model examines microstructural development, specifically, evolution in grain size, in U3Si2 fuel. This model is then incorporated into the rate theory framework to analyze fission gas release and the retained fission gas bubble areal fraction during irradiation. The integration of these mesoscale models enhances our understanding of the impact of grain size evolution on fission gas behavior. The simulations of fission gas release show good agreement with post-irradiation examination (PIE) data, providing validation to the model and insights into the varying retained fission gas behavior observed in different regions of irradiated fuel pellet.
KW - Fission gas behavior
KW - Light water reactor (LWR)
KW - Phase-field method
KW - Rate theory
KW - Silicide fuels
UR - https://www.scopus.com/pages/publications/85218263012
U2 - 10.1016/j.nucengdes.2025.113905
DO - 10.1016/j.nucengdes.2025.113905
M3 - 文章
AN - SCOPUS:85218263012
SN - 0029-5493
VL - 435
JO - Nuclear Engineering and Design
JF - Nuclear Engineering and Design
M1 - 113905
ER -