新型钍基熔盐堆堆芯方案及燃耗分析

摘要

Core layout and depletion features of thorium molten salt reactor(TMSR)are analyzed using the self-developed lattice and core code SONG/TANG-MSR.Based on the results of previous lattice optimization research,fuel salt that contains no BeF2 is adopted,BeO is introduced as moderator instead of graphite,and SiC is chosen as cladding material.According to further lattice analysis at core level,the optimized three-zone layout of core is obtained,with high breeding ratio,negative power coeffi-cient,flat temperature distribution.Thereafter,the depletion calculation and analysis is performed considering the online process-ing of fuel salt.The results show that the core has high breeding ratio,short doubling time,and long term stable operation. Thus,the design of TMSR has been greatly improved with increased breeding ability and sufficient safety margins.%采用自主开发的 SONG/TANG-MSR栅格/堆芯分析程序对新型钍基熔盐堆(TMSR)进行堆芯布置与燃耗分析计算。根据前期的栅格分析相关工作,TMSR 采用了无铍(BeF2)燃料熔盐、氧化铍慢化剂以及碳化硅包壳,并在组件栅格初步优化分析的基础上,通过全堆芯计算对熔盐栅格进一步优化和分析,给出了堆芯三区布置方案。该方案具有较高的增殖比,负的功率系数,以及较平的温度分布。根据该堆芯方案,在考虑熔盐在线处理情况下进行了熔盐燃耗计算分析。结果表明,堆芯具有较高的增殖比、较短的倍增时间以及长期稳定运行能力。新型的钍基熔盐设计大大提高了增殖性能,同时又确保堆芯具有足够的安全性能。