摘要
基于氚扩散基本模型建立了氚扩散行为一维模拟程序,对模拟程序进行了典型实验验证,模拟结果与实验结果符合较好。分析了不同氚浓度、温度分布对锆合金包壳材料中氚的扩散行为的影响。分析结果表明:包壳-芯块间隙内氚浓度的升高会导致进出包壳的氚扩散通量提高,渗透通量增大;由于包壳氧化层相对较低的扩散系数,包壳氧化层的存在对氚渗透有较大的限制作用;温度对氚扩散速率的影响很显著,温度越高,扩散速度越快;锆合金外表面氧化层的相对低温限制了氚渗透出包壳管的速率,温度梯度导致的热致扩散有利于氚向包壳冷测扩散。
The research on the diffusion behavior of tritium in zirconium alloy is a crucial problem for nuclear power plant radiation safety evaluation.Based on the basic model of tritium diffusion,a one-dimensional simulation program for the behavior of tritium diffusion was established in this work.The simulation program was verified by typical experiments,and the simulation results were in good agreement with the experimental results.The effects of different concentration and temperature distribution of tritium on the diffusion behavior of tritium in zirconium alloy cladding materials were analyzed.The results show that the increase of tritium concentration in P-C gap lead to the increase of tritium diffusion flux and permeability flux in and out of cladding.Due to the relatively low diffusion coefficient of the coated oxide layer,the existence of the coated oxide layer limits the tritium permeability greatly.The effect of temperature on the diffusion rate of tritium is exponential.The higher the temperature is,the faster the diffusion rate is.The relative low temperature of the oxide layer on the outer surface of zirconium alloy limits the rate of tritium permeation out of the cladding tube.Thermally induced diffusion due to temperature gradient is beneficial to limit the permeation flux of tritium diffusing out of the zirconium cladding.
作者
周小凯
佟立丽
Zhou Xiaokai;Tong Lili(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2021年第3期128-133,共6页
High Power Laser and Particle Beams
基金
国家科技重大专项(2019ZX06004013)。
关键词
氚
锆合金
扩散行为
数值模拟
tritium
zirconium alloy
diffusion
numerical simulation
作者简介
周小凯(1995—),男,硕士研究生,从事反应堆严重事故研究;zhouxiaokai@sjtu.edu.cn;通信作者:佟立丽(1975—),女,副研究员,从事核反应堆安全研究;lltong@sjtu.edu.cn。
