界面反应引起弥散型燃料的芯体结构演化  

Evolution of Dispersion Fuel Meat Structure Caused by Interface Reaction

作　　者：邢忠虎[1] 应诗浩[1] 

机构地区：[1]中国核动力研究设计院核燃料及材料国家级重点实验室,成都610041

出　　处：《核动力工程》2000年第3期285-288,共4页Nuclear Power Engineering

摘　　要：在反应堆运行工况下 ,U3Si2 Al弥散型燃料的燃料颗粒与基体的界面相互扩散形成反应层 ,从而导致芯体结构的演化。本文根据Monte Carlo原理建立了弥散型燃料芯体的模拟方法 ,并用该方法模拟了燃料相体积分数为43 %和具有一定尺寸分布的球形燃料颗粒在芯体中的空间随机排列。根据所模拟的13551个颗粒样本 ,计算了反应层厚度从0到16μm变化时引起的芯体结构演化 ,其中包括U3Si2 燃料相体积分数、反应层体积分数、铝基体体积分数。In reactor operation,the resultant layers are formed by interdiffusion at the fuel particle matrix interfaces of U3Si2 Al dispersion fuel.This results in the evolution of meat structure.On the basis of Monte Carlo method,this paper developed simulation method of fuel meat,and simulated the stochastic space locations of spherical fuel particles in the meat.The fuel volume fraction is 43%,and the particles are in definite size distribution.For the 13551 simulated particle samples,the evolution of meat structure is calculated with layer thickness ranging from 0 to 16μm.The parameters of meat structure include the U3Si2 fuel volume fraction,resultant layer volume fraction,Al matrix volume fraction,particle contact probability and overlap degree as functions of layer thickness.

关 键 词：燃料颗粒 U3Si2-A弥散型燃料 芯体结构演化 

分 类 号：TL352.2[核科学技术—核技术及应用]