空间核热推进粒子球床堆堆芯设计参数敏感性分析  

Parameter Sensitivity Analysis to Particle Bed Reactor Design of SNTP

作　　者：姜夺玉 江新标[1] 王立鹏[1] 潘孝兵[1] 张信一[1] 

机构地区：[1]西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室,陕西西安710024

出　　处：《原子能科学技术》2015年第B05期107-112,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11275152)

摘　　要：基于空间核热推进(SNTP)粒子球床堆的物理模型,研究了控制鼓外径与反射层厚度、10 B富集度及厚度、栅径比与高径比、燃料球体积填充率等对粒子球床堆堆芯设计参数敏感性的影响。结果表明:反射层厚度取决于控制鼓外径的选择;10B富集度及厚度对堆芯可控性影响较小;对于所选堆芯,存在最优栅径比,增大堆芯高径比可增加堆芯径向中子泄漏率,进而提高控制鼓的控制价值;随着燃料球体积填充率的增大,堆芯keff增大,中子泄漏减少,能谱变硬,燃料球体积填充率的变化对堆芯轴向、径向中子注量率不均匀因子影响较小。本文研究结果对粒子球床堆堆芯设计参数的选择具有指导意义。The parameter sensitivity of reactor design in the reactor＇s configuration was illustrated by using MCNP calculation with particle bed reactor （PBR） model for SNTP. The parameters include the outer diameter of the drum, the thickness of the reflector, the enrichment of ^10B, the thickness of ^10B, the pitch/diameter value of the fuel element, the height/diameter value of the core, and the pebble packing rate. The results show that the reflector thickness is decided by the outer diameter of the drum, and the variation of the enrichment and thickness of ^10B have slightly controllable influence on core safety. There is an optimal value of pitch/diameter for PBR core. The neutron leakage rate can increase by increasing the value of height/diameter, which will further increase the control value of the drum. The keff increases, the neutron leakage decreases, and the energy spectrum becomes hardened when the pebble packing rate increases. In addition, the pebble packing rate increase has slight influence on the radialand axial neutron fluence rate inhomogeneous factor distributions. The results provide a reference for the future physical analysis of PBR.

关 键 词：空间核热推进 粒子球床堆 敏感性分析 堆芯安全 

分 类 号：TL329[核科学技术—核技术及应用]