摘要
99Tc是一种重要的长寿命裂变产物,半衰期长,极易随地下水迁徙扩散.将99Tc嬗变为短寿命或稳定核素,可有效降低其对环境的危害.99Tc在热中子谱下具有较大的吸收截面,采用PWR嬗变99Tc是一种可行途径.为了评估99Tc嬗变靶件对PWR堆芯中子学参数的影响,并为含嬗变靶件的PWR组件热工水力计算提供数据,本文对含99Tc的17×17 PWR组件进行模拟计算,给出了99Tc靶件加入前后,燃料温度系数、慢化剂温度系数的变化规律;计算了稳态工况下99Tc靶件的轴向释热率.相关结论可为PWR嬗变99Tc研究提供参考.
99Tc is a kind of important long-lived fission products with a very long half-life,which is easy to migrate with water underground. Transmuting^99 Tc to short life or stable nuclides will effectively reduce its harm to the environment. As^99 Tc has larger absorption cross section in the thermal neutron spectrum,it is a feasible way to transmute it in PWRs.In order to estimate the influence on the core neutronics parameters after putting the^99 Tc target into PWR,and to provide data for the thermal hydraulic calculation of PWR containing targets,the article has caculated fuel temperature coefficient,moderator temperature coefficient before and after putting ^99 Tc into a 17 × 17 PWR assembly and axial heat releasing rate of the ^99 Tc target in steady state condition. The relevant conclusion can provide reference for the continued study of ^99Tc transmutation in PWR.
出处
《南华大学学报（自然科学版）》
2015年第1期1-5,共5页
Journal of University of South China：Science and Technology
基金
863基金资助项目(SS2013AA051402)
关键词
^99Tc
中子学特性
释热率
99Tc
the neutronics characteristics
heat releasing rate
