乏燃料中的次锕系核素（MA）是核废物长期放射毒性的主要来源，且衰变的周期漫长，能否安全合理的处置MA核素成为限制核电发展的一个重要因素。.目前国内外技术最成熟、数量上占大多数的堆型为热中子反应堆。但是该堆中的中子平均能量较低，导致其对MA的嬗变效果并不理想，尤其是MA的直接裂变率过低。针对该问题的解决，本项目拟在热中子堆中利用6LiD进行热-快中子转换来提高MA核素的嬗变率。具体研究内容为：首先设计并不断优化得到结构上适合热中子堆使用的MA核素嬗变靶（①MA/6LiD套管式嬗变靶; ②MA/6LiD/UO2管式非均匀嬗变靶；③MA/6LiD涂层式非均匀嬗变靶），随后研究各种嬗变靶件对堆芯安全参数的影响，最后在堆芯安全参数受到保障的情况下开展MA核素嬗变率的计算研究。.通过本项目的实施得到效率较高的、可行的热中子堆嬗变MA的方案，解决目前MA在热中子堆中嬗变时裂变率过低的关键问题。

Minor actinides（MA） are the primary contributors to long term radiotoxicity in spent fuel, and they have very long decay cycle. Whether MA nuclides can be handled properly has become an important factor limiting the development of nuclear power. . At present the most mature technology in the world, the Numbers of thermal reactor   are overwhelming. However, neutron average energy in the thermal reactors is lower, which lead to unsatisfactory transmutation effect, especially the inefficient fission rate. To solve this problem, we put forward a technique proposal to use 6LiD neutron convert material in thermal reactors to transmute MA. The specific research contents are as follows: firstly, the MA nuclide transmutation target is designed and optimized continuously to suit for thermal neutron reactor structurally（①MA/6LiD sleeve transmutation target; ②MA/6LiD/UO2 tubular non-uniform transmutation target; ③ MA/6LiD coated non-niform.transmutation target), and then studied the influence on core safety parameters that various transmutation targets do. Finally, the calculating study of the transmutation rate of MA nuclide will be carried out when the core safety parameters are guaranteed..The project is expected to resolve key issues that lower fission rate of the MA in thermal reactors and provide new information and research technique for the study of the thermal reactors transmute MA technology.