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Bottom-Mounted Nozzle Failure Modes of a Nuclear Reactor Pressure Vessel under Severe Accident Conditions

机译:在严重事故条件下核反应堆压力容器的底部安装喷嘴失效模式

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Local failure modes associated with bottom-mounted penetration nozzles are examined as a part of research on sever accident management. Conventional creep rapture studies on reactor vessel lower head during a meltdown accident were based on an excessively simplified shear deformation model. In the present study, the mode of nozzle failures is investigated using data and nozzle materials from Sandia National Laboratory's Lower Head Failure Experiment (SNL-LHF). Crack-like separations were revealed at the nozzle weld metal to KPV interfaces indicating the importance of normal stress component rather than the shear stress in the creep rupture. Creep rapture tests were conducted for nozzle and weld metal materials, respectively, at various temperature and stress levels. Stress distribution in the nozzle region is calculated using elastie-viscoplastic finite element analysis (FEA) using the measured properties. Calculation results are compared with earlier results based on the pure shear model of TMI-2 VIP. It has been concluded from both LHF-4 nozzle examination and FEA that normal stress at the nozzle/lower head interface is the dominant driving force for the local failure with its likelihood significantly greater than previously assumed.
机译:将与底层穿透喷嘴相关联的本地失效模式作为对切割事故管理的研究的一部分。在熔化事故期间,在熔融事故期间对反应器容器下部头部的常规蠕变Rapture研究基于过度简化的剪切变形模型。在本研究中,使用来自Sandia National实验室的下部头部故障实验(SNL-LHF)的数据和喷嘴材料来研究喷嘴故障模式。在喷嘴焊接金属上显示出裂纹的分离,以显示正常应力分量的重要性而不是蠕变破裂中的剪切应力的kpv界面。在各种温度和胁迫水平下分别对喷嘴和焊接金属材料进行蠕变Rapture试验。使用测量性质使用弹性粘胶有限元分析(FEA)计算喷嘴区域中的应力分布。将计算结果与基于TMI-2 VIP的纯剪切模型进行比较。它从LHF-4喷嘴检查和FEA中得出结论,喷嘴/下部头部界面的正常应力是局部故障的主要驱动力,其可能性明显大于先前假设。

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