长寿命裂变产物在聚变驱动次临界堆包层中嬗变的中子学优化分析

Neutronic optimal analysis for the transmutation of long-lived fission products in the blanket for the fusion-driven subcritical system

商用裂变堆乏燃料中高放长寿命裂变产物(LLFP)由于其具有很强的放射毒性,所以对于它们的嬗变处理非常重要。在对世界上关于LLFP嬗变处理的广泛调研的基础上,考虑到LLFP的同位素分离技术的发展水平,选择了LLFP中99Tc、129I和135Cs的嬗变处理(?)料的化学形式,分析了不同慢化剂材料对嬗变能力的影响,同时针对聚变驱动次临界堆的多功能双冷核废料嬗变包层(DWTB)进行了LLFP嬗变的中子学设计和优化分析。

It is very important for transmutation of long-lived fission products (LLFP) due to the serious radioactive hazard of the LLFP from commercial fission reactors. Considering the developing level of LLFP isotopic separation technology, the chemical forms for transmutation of 99Tc,129I and 135Cs are presented. This paper discussed the transmutation effect of the different moderators on the burning efficiency. The dedicated dual-cooled long-lived radioactive waste transmutation blanket (DWTB) for the Fusion-Driven Subcritical system (FDS) has been considered to transmute LLFP. As the part of the DWTB conceptual design, the optimized LLFP compositions and form designs have been done to improve the performance of LLFP transmutation. Neulronics optimal calculation about LLFP transmutation has been carried out to compare the performances of different LLFP transmutation designs.