ADS熔盐散裂靶中子学性能研究  

Neutronics Performance of Molten Salt Spallation Target in ADS

作　　者：杨璞[1,2] 林作康 万唯实[3] 严睿 余笑寒[1] 邹杨[1] YANG Pu;LIN Zuokang;WAN Weishi;YAN Rui;YU Xiaohan;ZOU Yang(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210

出　　处：《原子能科学技术》2020年第5期796-803,共8页Atomic Energy Science and Technology

基　　金：中国科学院战略性先导科技专项资助项目(XDA02010200)。

摘　　要：与传统加速器驱动次临界系统(ADS)采用金属靶作为散裂中子靶的设计不同,加速器驱动次临界熔盐堆(AD-MSRs)采用靶堆一体的设计,直接使用燃料熔盐作为散裂中子靶。由于熔盐靶的中子学性能直接影响AD-MSRs的能量放大系数、核废物的嬗变和核燃料增殖的效率,所以本研究基于MCNPX程序,详细计算了高能质子轰击氟盐和氯盐两种熔盐靶产生的散裂中子产额、散裂中子能谱、能量沉积分布以及散裂产物等中子学性能,并与液态Pb和铅铋共熔体(LBE)两种液态金属靶进行了对比。计算结果表明,熔盐靶在散裂中子产额上与液态金属靶有一定的差距,但熔盐靶内能量沉积分布的梯度较小,更有利于靶区的热量导出。与液态Pb和LBE靶相比,熔盐靶的散裂产物中包含更多的气体以及高质量数的α发射体核素。Unlike the traditional accelerator-driven subcritical system(ADS)using a metal target as the spallation neutron target,molten salt fuel is directly used as spallation neutron target in the target-integrated accelerator-driven subcritical molten salt reactors(AD-MSRs).Neutronics performance of the molten salt target has direct effect on the energy amplification factor of AD-MSRs,as well as the nuclear waste transmutation characteristic and fuel breeding efficiency.Therefore,a detailed study based on MCNPX was carried out on the spallation process of fluoride and chloride salt targets bombarded with high energy proton.The neutronics performances such as spallation neutron yield,spallation neutron energy spectrum,energy deposition distribution and spallation products produced by molten salt target were compared with liquid lead and lead-bismuth eutectic(LBE)targets.The calculation results show that the spallation neutron yield of molten salt target is lower than that of the liquid metal targets,but the gradient of the energy deposition distribution of the molten salt target is smaller,which is more favorable in terms of heat release at the target region.Compared with the liquid lead and LBE targets,the molten salt targets contain more gas fission products and high mass number alpha emit nuclei.

关 键 词：ADS 散裂靶 熔盐 MCNPX 

分 类 号：TL329[核科学技术—核技术及应用]