加速器驱动的次临界系统的燃耗分析计算和堆芯优化设计

Calculation and Analysis of Burnup and Optimum Core Design in Accelerator Driven Sub-critical System

以加速器驱动的次临界系统（ADS）在事故情况下仍处于次临界、keff随燃耗时间变化的最大范围不超过1.5%和包壳材料HT9钢可承受的最大辐照损伤的前提下,将堆芯燃料区分为嬗变区和增殖区,并将整个过程保持嬗变区的燃料成分不变。通过对ADS燃料的组成成分、堆芯布置和堆芯功率分布等方面的研究,在Pu的外层富集度与内层富集度之比为1.0~1.5范围内,调整增殖区的燃料成分,并利用MCNP和ORIGEN耦合的COUPLED2程序计算keff随燃耗时间的变化。同时,综合考虑功率展平、次锕系核素的嬗变率和燃耗深度等因素,建立1套符合工程实际的次临界系统。

The premise of the accelerator driven sub-critical system（ADS） in the accident is still subcritical,the biggest keff change with burn time is less than 1.5% and the cladding material,HT9 steel,can withstand the maximum radiation damage,core fuel area is divided into fuel transmutation area and fuel multiplication area,and fuel transmutation area maintains the same fuel composition in the whole process.Through the analysis of the composition of the fuel,shape of core layout and the power distribution,etc.,supposed outer and inner Pu enrichment ratio range of 1.0-1.5,then the fuel components of fuel multiplication area was adjusted.Time evolution of keff was calculated by COUPLED2 which coupled with MCNP and ORIGEN.At the same time the power peaking factors,minoractinides transmutation rate desired to maximization and burnup were considered.A sub-critical system fitting for engineering practice was established.