摘要
高温气冷堆一回路的放射性物质主要取决于包覆燃料颗粒在燃料元件制造过程中和辐照条件下的破损率，畸形ＵＯ２芯核（椭球状、带小尾巴形和连体等）是燃料元件制造过程中包覆燃料颗粒发生破损的主要原因之一，因此燃料元件设计中，畸形ＵＯ２芯核的份额要求小于１×１０－４，即在９５％的置信度下，在随机抽取的近３００００个ＵＯ２芯核中不允许有１个畸形芯核。报道了检查畸形芯核的抽样方案和检验方法，该方法是将随机抽取的样品通过一块平板，控制平板的倾斜度、振幅和频率，可以有效地将畸形芯核从样品中分离出来。实践表明该方法速度快，结果可靠，将用于１０ＭＷ高温气冷堆燃料元件的生产。
The primary circuit activity in a high temperature gascooled reactor (HTGR) depends mainly on the failure fraction of the coaled fuel particles (CP) in manufacture and during irradiation. The oddshaped UO2 kernels (ellipsoids, kernels with tails, twins etc.) are one of main reasons of CP failure in fuel element fabrication. The design requirement of the rate of oddshaped UO2 kernels is less than 1×10-4. According to this requirement, a random sample containing about 30000 UO2 shouldn't have any oddshaped kernels. This paper briefly introduces sampling plan and determination method to examine the rate of oddshaped kernels. This determination is a vibrational separation method. The separation is performed by passing the UO2 kernels over slightly inclined vibrating plate with prescribed frequency and amplitude. This vibrational separation method with fast inspection speed and reliable results will be applied to quality control the production of 10MW HTGR fuel elements.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1998年第7期4-6,10,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"八六三"高技术项目
关键词
振动分离法
二氧化铀
芯核
高温气冷堆
oddshaped UO2 kernels
vibrational seperation method
high temperature gascooled reactors
