铅铋冷却的加速器驱动的次临界堆的燃耗分析

Analysis of Burnup in Lead-Bismuth Cooled Accelerator Driven Sub-critical Reactor

对热功率800MW,加速器质子能量600MeV的铅铋合金冷却的加速器驱动的次临界系统进行了物理特性上的研究和堆芯设计。利用清华大学核研院自主开发的耦合MCNPX2.1.5和ORIGEN2.1的三维燃耗程序COUPLE 2进行计算分析。研究了不同的栅径比以及次锕系核素(MA)的含量对反应性和燃耗过程的影响。综合考虑keff变化、安全性以及嬗变效果等因素,选取合适的栅径比以及MA含量,建立一套物理上初步可行的铅铋冷加速器驱动的次临界方案。

In this paper, the physical characteristics of the lead-bismuth cooled accelerator driven sub-critical system （ADS）are studied, and the physical design is proposed. The thermal power of the reactor is 800MWt, and the proton energy of the acceleratoris 600MeV. A code system COUPLE2 based on MCNPX2.1.5 and ORIGEN2.1 is used to analyze the neutron transports and depletion of nuclides. The effect of pitch-to-diameter （P/D） and MA concentration on kafand depletion is studied. Considering the time evolution of kaf, safety factors and transmutation rate, a proper pitch-to-diameter and MA content is selected. A preliminary feasible scheme of lead- bismuth cooled accelerator driven sub-critical system is established.