TY - JOUR
T1 - Modeling the influence of bubble pressure on grain boundary separation and fission gas release
AU - Chakraborty, Pritam
AU - Tonks, Michael R.
AU - Pastore, Giovanni
N1 - Funding Information:
This work was funded by the DOE Nuclear Energy Advanced Modeling and Simulation Program .
PY - 2014/9
Y1 - 2014/9
N2 - Grain boundary (GB) separation as a mechanism for fission gas release (FGR), complementary to gas bubble interlinkage, has been experimentally observed in irradiated light water reactor fuel. However there has been limited effort to develop physics-based models incorporating this mechanism for the analysis of FGR. In this work, a computational study is carried out to investigate GB separation in UO2 fuel under the effect of gas bubble pressure and hydrostatic stress. A non-dimensional stress intensity factor formula is obtained through 2D axisymmetric analyses considering lenticular bubbles and Mode-I crack growth. The obtained functional form can be used in higher length-scale models to estimate the contribution of GB separation to FGR.
AB - Grain boundary (GB) separation as a mechanism for fission gas release (FGR), complementary to gas bubble interlinkage, has been experimentally observed in irradiated light water reactor fuel. However there has been limited effort to develop physics-based models incorporating this mechanism for the analysis of FGR. In this work, a computational study is carried out to investigate GB separation in UO2 fuel under the effect of gas bubble pressure and hydrostatic stress. A non-dimensional stress intensity factor formula is obtained through 2D axisymmetric analyses considering lenticular bubbles and Mode-I crack growth. The obtained functional form can be used in higher length-scale models to estimate the contribution of GB separation to FGR.
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U2 - 10.1016/j.jnucmat.2014.04.023
DO - 10.1016/j.jnucmat.2014.04.023
M3 - Article
AN - SCOPUS:84901398255
SN - 0022-3115
VL - 452
SP - 95
EP - 101
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3
ER -