AFIP-6 MKII First Cycle Report

N.E. Woolstenhulme

关键词: AMPLIFICATION;    DESIGN;    FUEL PLATES;    IRRADIATION;    MODIFICATIONS;    PLATES;    TEST REACTORS AFIP-6 MKII;    Flow;    GTRI;    Induced;    Vibrations;    Vortices;   

DOI  :  10.2172/1042369
RP-ID  :  INL/EXT-12-25170
PID  :  OSTI ID: 1042369
Others  :  TRN: US1202856

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

The first fuel plate frame assembly of the AFIP-6 MKII experiment was irradiated as planned from December, 2011 through February, 2012 in the center flux trap of the Advanced Test Reactor during cycle 151A. Following irradiation in this cycle and while reconfiguring the experiment in the ATR canal, a non-fueled component (the bottom plate) of the first fuel plate frame assembly became separated from the rail sides. There is no evidence that the fueled region of the fuel plate frame assembly was compromised by this incident or the irradiation conditions. The separation of this component was determined to have been caused by flow induced vibrations, where vortex shedding frequencies were resonant with a natural frequency of the bottom plate component. This gave way to amplification, fracture, and separation from the assembly. Although parallel flow induced vibrations were analyzed, vortex shedding flow induced vibrations was an unfamiliar failure mode that was difficult to identify. Both the once-irradiated first fuel plate and un-irradiated second fuel plate frame assemblies were planned for irradiation in the subsequent cycle 151B. The AFIP-6 MKII experiment was excluded from irradiation in cycle 151B because non-trivial design modifications would be needed to mitigate this type of incident during the second irradiation cycle. All items of the experiment hardware were accounted for and cycle 151B occurred with a non-fueled AFIP backup assembly in the center flux trap. Options for completion of the AFIP-6 MKII experiment campaign are presented and future preventative actions are recommended.