含强吸收体堆芯的各向异性SP_(3)两步法计算研究  

Anisotropic SP_(3)Two-Step Method for Reactor Cores with Strong Absorbers

作　　者：李云召[1] 秦浚玮 夏凡 吴宏春[1] 曹良志[1] Li Yunzhao;Qin Junwei;Xia Fan;Wu Hongchun;Cao Liangzhi(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an,710049,China;Shanghai Nuclear Engineering Research&Design Institute Co.,Ltd.,Shanghai,200233,China)

机构地区：[1]西安交通大学核科学与技术学院,西安710049 [2]上海核工程研究设计院股份有限公司,上海200233

出　　处：《核动力工程》2023年第6期9-15,共7页Nuclear Power Engineering

基　　金：国家自然科学基金(11975181)。

摘　　要：核反应堆堆芯中出现的强吸收体,尤其是可移动的控制棒,会显著增强堆芯内中子角注量率的角度各向异性效应,传统的各向同性SP3两步法不能进行有效刻画,需要构建各向异性SP3两步法。本文首先从2个方面研究各向异性效应;推导了各向异性SP3方程,建立了适用于各向异性SP3方程的均匀化模型。通过材料试验堆(MTR)对本文方法进行验证与分析。结果表明,本文研究的各向异性SP3方程及其均匀化方法较之传统计算方法偏差更小,对于有效增殖系数(k_(eff))和功率分布改善较为明显。因此,本文研究的各向异性SP3两步法能够有效处理含强吸收体堆芯问题。The strong absorber in the core of nuclear reactor,especially the movable control rod,will significantly enhance the angular anisotropy effect of neutron angular fluence in the core.The traditional isotropic SP_(3)two-step method cannot capture the feature effectively,therefore,the anisotropic SP_(3)two-step method needs to be constructed.Firstly,this paper studies the anisotropic effect from two aspects;the anisotropic SP_(3)equation is derived,and a homogenization model suitable for anisotropic SP_(3)equation is established.The methodology proposed in this paper was validated and analyzed through the Material Test Reactor(MTR).The results show that the anisotropy SP_(3)equation and its homogenization method in this paper have smaller deviation than the traditional calculation method,and the effective multiplication factor(k_(eff))and power distribution are obviously improved.Therefore,the anisotropic SP_(3)two-step method in this paper can effectively deal with the core problem with strong absorbers.

关 键 词：强吸收体 细网均匀化 各向异性SP_(3) 材料试验堆 

分 类 号：TL324[核科学技术—核技术及应用]