An advanced model for intragranular bubble diffusivity in irradiated UO2 fuel

被引：31
|
作者：
Veshchunov, M. S. [1 ]
Shestak, V. E. [1 ]
机构：
[1] Russian Acad Sci, Nucl Safety Inst IBRAE, Moscow 115191, Russia
来源：
JOURNAL OF NUCLEAR MATERIALS | 2008年 / 376卷 / 02期
基金：
俄罗斯基础研究基金会;
关键词：
D O I：
10.1016/j.jnucmat.2008.01.026
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An advanced model for intragranular bubble diffusivity in irradiated UO2 fuel is developed. Three various (surface, volume and gas-phase) mechanisms for the gas-filled bubbles diffusivity are reconsidered. It is shown that the bubble mobility by the volume diffusion mechanism can be strongly enhanced under irradiation conditions. Influence of the two-phase interface kinetics at a bubble surface on the volume diffusion, evaporation/condensation and surface migration mechanisms that can strongly suppress diffusivity of small nanometre bubbles, is additionally studied using a non-linear adsorption law derived for the van-der-Waals gas in the bubbles, The improved model is implemented in the MFPR code and validated against measurements of the small bubbles mobility. (C) 2008 Elsevier B.V. All rights reserved.
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页码：174 / 180
页数：7
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