板状燃料富集度对燃料性能的影响研究  

Effect of enrichment of plate-type fuel assembly on fuel performance

作　　者：岳智瑛 贺亚男 刘洪权 巫英伟[1,2] 章静[1,2] 苏光辉[1,2] 田文喜[1,2] 秋穗正[1,2] YUE Zhiying;HE Yanan;LIU Hongquan;WU Yingwei;ZHANG Jing;SU Guanghui;TIAN Wenxi;QIU Suizheng(Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology,School of Nuclear Science and Technology,Xi'an Jiaotong University,Xi'an 710049,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学核科学与技术学院陕西省先进核电技术重点实验室,西安710049 [2]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《核技术》2024年第6期159-167,共9页Nuclear Techniques

基　　金：国家重点研发计划(No.2022YFB1902400);中核集团青年英才项目;中核集团领创科研项目基金资助。

摘　　要：核燃料的富集度对燃料性能有着重要的影响。为探究燃料富集度对U3Si2-Al板状燃料性能的影响,本研究基于BEEs-Plates/OpenMC/ZEBRA耦合程序,针对15%、20%和25%富集度的组件开展了中子物理-热工水力-燃料性能耦合计算,并分析了组件平均燃耗达125.71 GWd·tU^(-1)时的中子物理参数和燃料性能参数。计算结果表明,燃料组件富集度越高,其体积应变、蠕变应变和塑性应变越大。对中子物理参数的分析结果表明,25%富集度的组件功率密度比15%富集度的组件高出约18%,且富集度越高的组件最大燃耗也越大。对燃料性能参数的分析结果表明,25%富集度的组件塑性应变比15%富集度的组件最大高约40%,说明富集度越高的组件越容易发生失效。[Background]The enrichment of nuclear fuel may significantly influence the fuel performance of a reactor.[Purpose]This study aims to explore the effect of U3Si2-Al plate-type fuel enrichment on its performance,[Methods]The fuel performance analysis code BEEs-Plates,neutronics Monte Carlo code OpenMC,and the one-dimensional system analysis code ZEBRA were coupled together within the MOOSE(Multiphysics Object-Oriented Simulation Environment)framework.Then the coupling code was employed to conduct the multiphysics coupling calculation for JRR-3(Japanese Research Reactor No.3)fuel assembly enriched at 15%,20%,and 25%.The data exchange among the three codes were realized with the help of interpolation transfer method implemented in MOOSE.Additionally,neutron physical parameters and fuel performance parameters after 231 d of operation were analyzed when the average fuel consumption of the module was 125.71 GWd∙tU^(−1).[Results]The calculation results indicate that the max power density of fuel assembly enriched at 25% is 18% higher than the assembly enriched at 15%. Due to the high thermal conductivity of aluminum, the temperature difference in the fuel assembly is almost negligible whilst there is a significant difference in the fast neutron fluence. The results of fuel temperature and fast neutron fluence show that the volumetric strain is more obviously affected by the fuel temperature. Specifically, the plastic strain of the assembly with 25% enrichment is approximately 40% higher than that of the assembly with 15% enrichment. [Conclusion] The analysis results of this study suggest that the assembly with a higher enrichment is more prone to failure.

关 键 词：中子物理 热工水力 燃料性能 U3Si2-Al燃料 多物理场耦合 

分 类 号：TL333[核科学技术—核技术及应用]