快中子脉冲堆中子价值计算研究  

Study of Neutron Importance on Fast Neutron Burst Reactor

作　　者：杜金峰[1] 尹延朋[2] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900 [2]国家核技术工业应用工程技术研究中心,四川绵阳621900

出　　处：《核动力工程》2007年第z2期1-3,7,共4页Nuclear Power Engineering

摘　　要：利用MCNP程序建立了CFBR-Ⅱ堆结构的三维模型,借助中子倍增的方法实现了计算中子价值的功能。为消除实验中用中间钢托盘孔道内的中子价值代替上下半球的中子价值而引起的差异,利用均匀抽样技巧对各区域沿径向分层细致计算。结果表明,中子价值最大处位于高富集度铀区域中间某层而非系统中心或上下半球球心,其他区域中子价值则沿径向单调递减。The simulation calculation of neutron importance on fast neutron burst reactor (CFBR-II re- actor) is introduced in this paper. The three-dimension model with complicated structure of CFBR-Ⅱ reactor is finished using MCNP program and the calculation of neutron value is realized by neutron multiplication method. In order to eliminate the difference of using the relative neutron importance in the hole of steel salver instead of the one in the core and reflector, the uniform sampling technique is applied to study the neutron importance detailed distribution along radial. The results indicate that the maximum neutron importance lies in areas of enrichment uranium or middle certain layer but not in system center or sphere core, the other areas are monotone descending along radial.

关 键 词：快中子脉冲堆 中子价值 中子倍增 均匀抽样 

分 类 号：TL329+.2[核科学技术—核技术及应用]