稠密重水栅格嬗变少锕系核素研究  

Study of Minor Actinides Transmutation in Heavy Water Cooled Tight -Pitch Lattice

作　　者：徐晓勤[1] 代谷诚治[2] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]京都大学反应堆研究所

出　　处：《核动力工程》2002年第3期94-97,共4页Nuclear Power Engineering

基　　金：国家自然科学基金资助;批准号19777102

摘　　要：少锕系核素(MA)具有较长的半衰期和极大的生理毒性。烧毁动力堆乏燃料中产生的MA可明显减少对环境产生的影响,是一种创新的技术路线。由于MA具有强的中子、γ及α发射率和产热率,其燃料元件的化学处理、制造等过程须采取更严格的屏蔽和控制措施。从经济性观点出发,集中嬗变MA的方案较为适宜,MA嬗变以快中子谱较为有效。本文提出稠密重水栅格嬗变MA的方案,并应用SRAC95程序进行了计算。结果表明,稠密重水MA栅格可保证其有效地烧毁MA。由于其有效缓发中子份额极低,故以采用加速器驱动次临界系统较为适宜。Minor actinides inhere long half-life and high toxicity. It is an altern-ative technical pathway and helpful for reducing environmental impact to incinerate minor actinides in spent fuel of nuclear power plants. Because of its high neutron, γand β emitting rates and heat generation rate, it is necessary to imply more severe control and shielding techniques in the chemical treatment and fabrication. From economic view-point, It is suitable to transmute minor actinides in concentrated way. In this paper, a technique for MA transmutationby heavy water cooled tight-pitch lattice system is proposed, and calculated with SRAC95 code system. It is shown that tight-pitch heavy water lattice can transmute MA effectively. The accelerator-driven subcritical system is practical for MA transmu-tation because of its low fraction of effective delay neutrons.

关 键 词：稠密栅格 重水 少锕系核素 

分 类 号：TL329.2[核科学技术—核技术及应用] TL942.29