长寿命高放射性核废料管理是当前一次性通过燃料循环的一大难题。液态熔盐堆采用熔盐混合物为冷却剂兼燃料，具有在线加料及燃料后处理等功能，可实现极深燃耗运行，在核废料嬗变方面具有独特的优势。目前国内外针对核废料中高放射性次锕系核素（MA, Minor Actinides）在熔盐堆深燃耗运行时复杂的中子物理及热工行为研究仍处于探索阶段。本项目拟结合中子物理和热工水力等方面从理论上探究深燃耗模式下熔盐堆嬗变MA的物理机制及燃耗平衡态行为、揭示堆芯多物理参数对MA嬗变效率影响的物理规律、研究MA与热工水力之间的相互作用机理并阐明MA嬗变过程中的瞬态安全特性，形成一整套熔盐堆深燃耗模式下MA嬗变研究的理论方法和技术路线。本项目属于基础物理研究，有助于推动熔盐堆嬗变的理论研究，可为降低核废料储存提供理论依据及数据支撑。

Management of the high long-lived radioactive waste is one of the most difficult issues with the once-through fuel cycle. Molten Salt Reactor (MSR), which adopts molten salt as both coolant and fuel with special features of online refueling and reprocessing, can operate with very deep burn-up and has unique advantages in nuclear waste transmutation. Currently, integrated research on the minor actinide (MA) transmutation associated with neutronic and thermal-hydraulic properties in MSRs with deep burn-up is still under the exploration stage at our nation and worldwide. In this project, considering the properties of neutronic physics and thermal hydraulics, the theoretical study on the mechanism of MA transmutation and the equilibrium behaviors of MA depletion in MSRs with deep burn-up will be conducted, the influence of various reactor physical parameters on the MA transmutation efficiency will be explored, the interaction mechanism between MA and thermal-hydraulic characteristics will be revealed and the transient safety during MA transmutation will be obtained, a set of theoretical methods and technical routes for the study of MA transmutation in MSRs with deep burn-up will be formed. This project belongs to the basic reactor physics research, which will promote the theory in MA transmutation and can provide fundamental theory and data for reducing the current high long-lived radioactive waste.