基于断裂强度的陶瓷燃料颗粒开裂模型  

A Model for Cracking of Ceramic Fuel Particles in Dispersion Fuel

作　　者：龙冲生[1] 赵毅[1] 高雯[1] 肖红星[1] 韦天国[1] 

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610041

出　　处：《核动力工程》2014年第1期92-96,105,共6页Nuclear Power Engineering

基　　金：国家自然科学基金项目(91226114)

摘　　要：基于陶瓷燃料断裂强度建立弥散型燃料中陶瓷燃料颗粒开裂行为的数学模型。以铜基弥散型燃料为例,通过计算预测燃料颗粒的开裂温度与燃耗的关系,分析基体金属、环境约束、燃料相的体积、燃料颗粒尺寸对开裂温度的影响,探讨提高燃料颗粒开裂温度的途径。结果表明,燃料颗粒开裂温度与燃耗深度近似呈幂律关系,随燃料相体积的增加近似直线下降;裂变气体气孔率和孔径的增加利于提高颗粒的开裂温度。Based on the fracture strength of ceramic material, an analytical model for the cracking of ceramic fuel particle in nuclear dispersion fuel was proposed m the paper, lhe relatlonsmp between me cracking temperature and the burn-up of fuel particles has been calculated. The effects of metal matrix, external restraint, fuel particle size and content on the fuel particle cracking behavior have been investigated in detail, and the approaches to increase the cracking temperature were also discussed. The result shows that, the cracking temperature of fuel particles would decrease approximately in power law with the increasing of burn-up and would decrease linearly with the increasing of fuel particle content. Relative higher porosity and bigger pore size could be helpful to increase the cracking temperature.

关 键 词：陶瓷燃料颗粒 开裂 数学模型 断裂强度 

分 类 号：TL352[核科学技术—核技术及应用]