燃耗信任制中可燃毒物对乏燃料反应性的影响分析
|
摘要
以压水堆(PWR)常用的可燃毒物棒(BPRs)为研究对象,定性分析了组件燃耗过程中不同类型的BPRs对燃料组件反应性的影响,为基于燃耗信任制的乏燃料贮存系统临界安全分析保守参数的选取提供参考。分析表明,在组件燃耗过程中含有BPRs时,忽略含钆毒物可使临界分析结果保守,而必须考虑涂硼燃料元件(IFBA)、湿式环状可燃毒物棒(WABA)、硼玻璃可燃毒物棒(PYREX)等对乏燃料反应性的影响。
This paper focuses on the burnable poison rods(BPRs)which are commonly used in pressurized water reactor(PWR),qualitatively analyzes the effect of different type of BPRs on reactivity of fuel assemblies during irradiation,and some suggestions are concluded based on the obtained results for conservative parameters selection in burnup credit criticality safety analysis of spent fuel storage system. The results show that neglecting the BPRs in a burnup credit criticality safety analysis will yield conservative results for assembly designs with UO_2-Gd_2 O_3 rods,and non-conservative results for assembly designs with IFBA,WABA,and PYREX rods.
This paper focuses on the burnable poison rods(BPRs)which are commonly used in pressurized water reactor(PWR),qualitatively analyzes the effect of different type of BPRs on reactivity of fuel assemblies during irradiation,and some suggestions are concluded based on the obtained results for conservative parameters selection in burnup credit criticality safety analysis of spent fuel storage system. The results show that neglecting the BPRs in a burnup credit criticality safety analysis will yield conservative results for assembly designs with UO_2-Gd_2 O_3 rods,and non-conservative results for assembly designs with IFBA,WABA,and PYREX rods.
引文
[1]U.S.NRC,Spent Fuel Project Office Interim Staff Guidance-8,Rev.3-Burnup Credit in the Safety Analyses of PWR Spent Fuel in Transport and Storage Casks[R],U.S.Nuclear Regulatory Commission.
[2]陈志宏,沈季,李亢.AP1000乏燃料贮存格架临界安全分析[J].原子能科学技术,2014,48(增刊1):433-436.
[3]I.C.Gauld and J.C.Ryman,Nuclide Importance to Criticality safety,Decay Heating,and Source Terms Related to Transport and Interim Storage of High-Burnup LWR Fuel[R],NUREG/CR-6700(ORNL/TM-2000/284),prepared for the U.S.NRC by Oak Ridge National Laboratory,Oak Ridge,Tenn,January 2001.
[2]陈志宏,沈季,李亢.AP1000乏燃料贮存格架临界安全分析[J].原子能科学技术,2014,48(增刊1):433-436.
[3]I.C.Gauld and J.C.Ryman,Nuclide Importance to Criticality safety,Decay Heating,and Source Terms Related to Transport and Interim Storage of High-Burnup LWR Fuel[R],NUREG/CR-6700(ORNL/TM-2000/284),prepared for the U.S.NRC by Oak Ridge National Laboratory,Oak Ridge,Tenn,January 2001.