加速器驱动的次临界系统初步概念设计

基于初始Pu装载对加速器驱动的次临界系统(ADS)嬗变次锕系核素（MA）的影响，提出了6种采用(TRU-10Zr)-Zr*弥散体燃料的ADS概念设计方案。运用MCNP与ORIGEN2程序对ADS嬗变MA堆芯进行稳态与燃耗计算，比较分析MA的嬗变效果、有效增殖因数k_eff、质子束流流强I_p与初始Pu含量的关系。计算结果表明：随着初始Pu含量的增加，MA的嬗变率减小，初始I_p增大；初始Pu含量小于33%，k_eff随时间的变化是先增大后减小，大于33%后一直减小，且随着初始Pu含量的增加，k_eff减小得更加明显。故初始钚含量为33%的方案为最佳，其k_eff的相对变化不超过1%，I_p小于20 mA，MA嬗变率高达28.06%，嬗变支持比为29.23，满足初步设计要求。

Preliminary Conceptual Design of Accelerator Driven Sub-critical System

Six types of conceptual design of accelerator driven sub-critical system (ADS) were proposed considering the effect of initial plutonium loading for ADS to transmute minor actinides. In the specific design, uranium-free metallic dispersion fuel of (TRU-10Zr)-Zr* was used as the fuel. MCNP and ORIGEN2 codes were applied to the neutron simulation and burnup calculation for ADS, and the MA transmutation effect, the effective multiplication factor k_eff and proton beam current corresponding to initial plutonium content were investigated. The results show that, with the increase of the initial plutonium content, the transmutation rate of MA decreases and the initial proton beam current increases; the initial plutonium content is less than 33%, the variation of the effective multiplication factor with burnup time increases at first and then decreases, when greater than 33%, it decreases all the time, and with the increase of the initial Pu content, k_eff decreases more obviously. Therefore, 33% of the initial plutonium content of the conceptual design is chosen, the relative change of k_eff is less than 1%, the proton beam current is less than 20 mA, the transmutation rate of MA can reach 28.06%, and support ratio of MA transmutation can reach 29.23.