SARAX-FXS程序针对非均匀快堆堆芯计算中的改进及应用  

Improvement and Application of SARAX-FXS Code in Calculation of Heterogeneous Fast Reactor Core

作　　者：杜夏楠 曹良志[1] 郑友琦[1] 

机构地区：[1]西安交通大学核科学与技术学院,陕西西安710049

出　　处：《原子能科学技术》2017年第12期2271-2277,共7页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11475134;11522544)

摘　　要：SARAX-FXS程序是基于确定论方法,适用于快谱堆芯组件能谱、均匀化参数计算的程序。由于快堆中组件空间自屏的非均匀效应不可忽视,本文将基于一维圆柱、平板几何的碰撞概率方法加入SARAX-FXS模块,并以等效一维模型计算组件的均匀化参数。为保证能群归并前后的核反应率守恒,在组件计算中引入超级均匀化(SPH)因子修正截面。采用快堆基准题MET-1000对程序的计算结果进行验证,结果表明,与参考解相比,SARAX-FXS的一维计算模块具有较高的精度,特征值计算相对偏差在100~200pcm之间。堆芯计算结果显示,引入SPH因子可提高特征值计算的精度约300pcm,功率分布的均方根误差可从约3%下降至约1%。The SARAX-FXS code is a calculation program based on the deterministic method. It has the capabilities of calculating neutron spectra and homogenized cross sec-tions of fast reactor analysis. Since the heterogeneous effect within the assembly was not negligible in fast reactor system, the collision probability method （CPM） with one- dimension slab and cylinder geometry was introduced into the SARAX-FXS code to obtain the homogenized cross sections with this one-dimension geometry. Meanwhile, in order to conserve the reaction rate after energy group condensation, the super-homoge-neous （SPH） factor was also implemented in the calculation. To verify the development of the code, the MET-1000 benchmark loaded with metallic fuel was chosen as the veri-fication case. Compared with the reference solutions, the eigenvalue calculated by SARAX-FXS with CPM shows the high accuracy with 100-200 pcm relative deviation.Meanwhile,the whole core calculation shows that the application of SPH factor could enhance the accuracy about 300 pcm and the root-mean-square error of power distribu-tion could decrease from about 3% to 1%.

关 键 词：SARAX-FXS 非均匀效应 碰撞概率法 SPH因子 快堆基准题 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]