ADS稳态中子注量率高阶谐波重构的理论研究  

Theoretical Study of Steady State Neutron Flux Density Re-Construction in ADS by Using Higher-Order Modes

作　　者：谢金森[1,2] 陈珍平[1,2] 于涛[1,2] 谢芹[1,2] 曾文杰[1,2] 刘紫静[1,2] 何丽华[1,2] 

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]南华大学核能与核技术工程虚拟仿真实验教学中心,湖南衡阳421001

出　　处：《核动力工程》2017年第6期27-30,共4页Nuclear Power Engineering

基　　金：国家自然科学基金(11305088;11575079);湖南省自然科学基金(14JJ2088)资助课题

摘　　要：加速器驱动次临界反应堆(ADS)的中子注量率由基波与高阶谐波中子注量率叠加形成。基于谐波与共轭谐波中子的双正交特性,建立了ADS稳态中子注量率谐波展开理论,并针对三维4群ADS扩散问题开展数值研究。结果表明:λ谐波和瞬发α谐波可有效地重构ADS稳态中子注量率,重构精度随谐波展开阶数增加而提高;相比瞬发α谐波,λ谐波具有更高的稳态中子注量率重构精度。由于分析对象外中子源和堆芯布置的对称性,仅有特定对称性的谐波对稳态中子注量率有贡献。Neutron flux density in Accelerator Driven Subcritical reactor （ADS） is formed by superposition of fundamental and higher-order modes neutron flux density. Based on the bi-orthogonal properties of forward and ad-joint modes, modes expansion theory for steady state neutron flux density in ADS is established in this paper, and numerical studies on three dimensional four groups ADS diffusion problem are performed. Results indicate that both λ and prompt a modes can effectively re-construct the steady state neutron flux density of ADS, and neutron flux re-construction accuracy is improved by increasing expansion modes. Comparing to prompt a modes, λ modes are more appropriate for the steady state neutron flux density re-construction. Because of the symmetries of external neutron source and core pattern in this paper, only modes that have symmetrical properties have contributions to the steady state neutron flux density.

关 键 词：加速器驱动次临界反应堆(ADS) 稳态中子注量率重构 λ谐波 瞬发α谐波 

分 类 号：TL329[核科学技术—核技术及应用]