摘要
Gd2O3-UO2可燃毒物燃料是近年来核电站采用较为普遍的可燃毒物之一.传统观点认为在芯块制造过程中添加U3O8粉末会降低芯块的烧结密度,本文研究了在Gd2O3-UO2芯块基体密度～94%T.D的基础上,添加不同品比例由AUC煅烧得到的U3O8粉末,经成型、H2/H2O气氛中17500C烧结后表明,随着U3O8加入量的增加,芯块的密度也随之增加,U3O8添加量大于40wt%时芯块的密度达到～97%T.D.,U3O8的加入相当于起到了助烧剂的作用,这一现象和传统的U3O8降低芯块密度的观点正好相反,而芯块的平均晶粒尺寸～8μm.
Gd2O3-UO2 is widely used as burnable absorber in nuclear power plants in recent years. It is traditionally considered that the density of Gd2O3-UO2 pellets will decrease with the adding of U3O8 powder. The original density of Gd2O3-UO2 pellets is about 94%TD in this paper. U3O8 made by incineration of AUC powder is mixed with Gd2O3 and UO2 powder, and powder mixtures with various U3O8 contents are pressed into compacts and sintered at 1750℃ in H2/H2O atmosphere. However, it is observed that the Gd2O3-UO2 pellet density increases with the adding of U3O8 powder. When the adding amount is more than 40wt% U3O8, the Gd2O3-UO2 pellet density is about 97%TD, and the U3O8 played a role as sintering additives. This phe-nomenon is contrary to the traditional knowledge that adding U3O8 will decrease the pellet density. The aver-age grain size of the pellets is about 8μm.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2003年第5期450-453,共4页
Nuclear Power Engineering
基金
核工业科学基金资助(Y7100E5102)
