第五不稳定核素系中的原子流动情况及核燃料的耗-裂转化比  

The transformation and flow of atoms in the fifth unstable nuclide series and the transformation ratio of fuel consumption to fission production

作　　者：张家骅[1] 

机构地区：[1]中国科学院上海原子核研究所,上海201800

出　　处：《核技术》1998年第12期705-708,共4页Nuclear Techniques

摘　　要：采用原子流动的表达方式以描述238U在核动力堆中受到中子通量作用而耗损转化为一代接着一代衍生核素的原子流动情况，并由此得出在恒定的中子通量作用下，238U的耗损量转化为裂变物的关系式即核燃料（二级）的耗－裂转化比，它的数值随着238U所受的积分中子通量的增大而增大，其最高值只略低于1。此时，238U及其整个系统的各代衍生核素构成了一个完整的不稳定核素系，即第五不稳定核素系。在这之前，系统则处于第五不稳定核素系的发育阶段。Using a method based on the concept of 'now of atoms' in the nuclear fuel 238U to describe its generation of derived nuclide under neutron flux's reaction and the transformation of derived nuclide from generation to generation as well as fission prodtiction accompanied with each derived nuclide, expression of the instantaneous transformation for the fuel consumption and the total fission production is obtained.At the beginning stage, this ratio grows up from zero and increases gradually with reactor operating time corresponding to fifth unstable nuclide series constituted by 238U and its derived nuclide group being in the developing stage. As soon as the fifth unstable nuclide series reaches its equilibrium stage, the transforination ratio approaches its final value very close to unity.

关 键 词：第五不稳定 核素系 衍生核素 耗-裂转化比 

分 类 号：TL2[核科学技术—核燃料循环与材料]