基于多级加速的堆芯瞬态计算软件的开发与验证  

Development and verification of PWR core physical transient calculation software based on multilevel acceleration theory

作　　者：吴东阳 郝琛 徐宁 王毅箴 尹文 WU Dongyang;HAO Chen;XU Ning;WANG Yizhen;YIN Wen(College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学核科学与技术学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2024年第12期2304-2311,共8页Journal of Harbin Engineering University

摘　　要：为了在保证精度的前提下快速地进行堆芯物理计算,本文开发了一套具有自主知识产权的基于多级加速理论的瞬态扩散计算程序。采用基于广义等价理论粗网有限差分(gCMFD)框架下的节块展开法,开发瞬态扩散计算程序,通过一阶后向欧拉方法对时间导数项进行处理,并引入基于单群广义等价理论粗网有限差分的多级加速理论方法进一步提高瞬态计算效率。使用通量-体积权重法对尖端效应进行修正,利用二维TWIGL瞬态基准题和三维LMW瞬态基准题对开发的堆芯物理瞬态计算程序进行验证。研究表明:本文开发程序计算的堆芯归一化功率与基准解的相对偏差保持在1%以内,计算时间与未使用多级加速时相比缩短了近60%。使用多级预估-校正准静态方法能够在保证计算精度的同时,大幅缩短计算时间,提高计算效率,尖端效应的修正能够改善计算结果,降低因节块均匀化带来的计算偏差。A transient diffusion calculation program based on multilevel acceleration theory is developed to perform core physics calculations more rapidly while ensuring accuracy.The steady-state calculation module adopts the nodal expansion method within the framework of gCMFD,and the transient calculation module is developed on this foundation.The program uses the first-order backward Euler method to process the time derivative term and incorporates the multilevel acceleration theory using the one group gCMFD method to further improve transient calculation efficiency.Meanwhile,the flux-volume weighted method is used to correct the rod cusping effect.The program is verified using the 2D TWIGL transient benchmark problem and the 3D LMW transient benchmark problem.Results reveal that the relative difference in normalized core power between the results calculated by the program developed in this study and the benchmark remains within 1%,whereas the calculation time is reduced by nearly 60%when multilevel acceleration is adopted.The use of multilevel PCQM can shorten the calculation time and improve computation efficiency while ensuring accuracy.The correction of the rod cusping effect improves the calculation results and reduces errors caused by node homogenization.

关 键 词：堆芯物理计算 多级加速理论 中子扩散 瞬态 节块展开法 标准预估-校正准静态方法 多级预估-校正准静态方法 尖端效应 

分 类 号：TL325[核科学技术—核技术及应用]