快堆燃料组件内精细功率分布的计算  

Research on Pin Power Distribution in Fuel Subassembly of Fast Reactor

作　　者：曹攀[1] 喻宏[1] 徐李[1] 胡赟[1] 杨晓燕[1] 陈仪煜[1] 

机构地区：[1]中国原子能科学研究院中国实验快堆工程部,北京102413

出　　处：《原子能科学技术》2013年第B06期287-290,共4页Atomic Energy Science and Technology

摘　　要：堆芯热通道因子是堆芯热工设计及安全分析的一项重要参数,确定热通道因子需用中子学计算给出较准确的燃料组件内元件棒功率分布。在三维六角形几何节块扩散理论基础上,使用多项式重构的方法计算节块内中子通量密度分布和功率密度分布。针对快堆六角形燃料组件的特点,用小六角形积分的方法计算组件内元件棒功率,得到组件内各元件棒功率分布。在NAS程序基础上,编制了元件棒功率分布计算模块NAS-PIN。通过与蒙特卡罗程序的校验可发现,二者计算结果符合较好,计算精度可满足工程设计的需要。The reactor core hot spot factor is an important parameter for thermal-hydraulics design and safety analysis.Based on nodal expansion method used for solving neutron diffusion equations in hexagonal-z geometry,the orthogonal polynomial method was used to approximate to the neutron flux density distribution and the pin power distribution.Considering the features of hexagonal fuel subassemblies used in fast reactor,the small hexagonal integral method was used to calculate power of each pin.Based on NAS code,NAS-PIN module was encoded for calculation of pin power distribution.Comparing with the MCNP calculation results,the NAS-PIN calculation results are believable and can meet requirements for engineering design.

关 键 词：快堆六角形组件 精细功率分布 小六角形积分 NAS程序 

分 类 号：TL32[核科学技术—核技术及应用]