基于沉淀相粗化机制的裂变气泡长大模型研究
Research on Model of Fission Gas Bubble Growth Based on Oswald Ripening Mechanism
龙冲生 1张雨 1陈洪生 1肖红星 1韦天国 1赵毅1
作者信息
- 1. 中国核动力研究设计院反应堆燃料与材料重点实验室,成都,610213
- 折叠
摘要
基于合金中沉淀相粗化机制,建立了裂变气泡(FGB)长大的数学模型,以铀合金和陶瓷UO2燃料为例,计算了在不同辐照温度和外压约束下气孔率、平均孔径随燃耗深度的变化.对UO2燃料,当外压约束相同时,在700℃C下的气孔率增长速度比400℃c下的约快25％;外压约束对FGB的长大有一定抑制作用,但影响相对较小.由于金属燃料易于发生塑性变形,在同样的燃耗下,气孔率和平均孔径都显著大于陶瓷燃料.
Abstract
Based on the Ostwald ripening process,a mechanistic model for the fission gas bubble growth has been proposed in this paper.Taking U-Zr alloy and UO2 ceramic fuel as samples,the variation of FGB porosity and mean bubble size with the bum-up at different irradiation temperature and external restraint have been investigated in detail.For ceramic UO2,the porosity increase rate with the bum-up at 700℃ is 25％ faster than that at 400℃.The external restraint impedes the growth of FGB,but it is not very significant.The porosity and mean bubble size in U-Zr alloy for the same irradiation parameters are much greater than that in the ceramic UO2 because the plastic deformation takes place very easy and quickly for U-Zr alloy during irradiation.
关键词
裂变气体气泡/长大/机理模型/沉淀相粗化机制Key words
Mechanical model/Fission gas bubble/Growth/Oswald ripening引用本文复制引用
出版年
2016
NETL
NSTL
维普
万方数据