In the present study, a real nuclear power plant (NPP) outer containment structure has been considered for a safety check and the model has been simulated by Abaqus/implicit software. The Three Mile Island (TMI) containment structure has been taken into consideration for the analysis. The dimension of containment is 54.5 m height (without dome) and 45 m inner diameter. A step-by-step analysis was carried out to evaluate the stresses on the NPP wall due to aircraft crash with induced fire. At starting, the impact load 90 MN was applied to the NPP structure using force history curve of Boeing 707-320 aircraft and the angle of impact was considered as normal to the target. After impact, the nodal temperatures were applied to the model through heat transfer analysis using jet fuel curves due to fuel burning. Lastly, the impact and heat transfer effect were combined to get thermal stress behavior. The time gap between the impact of plane’s nose and plane’s wing was kept 0.18 s. Heat transfer analysis has been performed after that time because fuel is stored in wings. The most severe region for the effect of fire is upto 10 m height from the foundation because the maximum fuel will flow to the lowermost of structure. The place of impact was assumed at mid-height of cylindrical portion of TMI containment. The concrete damaged plasticity model for concrete material and Johnson–cook model for steel bar has been taken to incorporate the concrete behavior and reinforcement behavior, respectively. For heat transfer and thermal stress analysis, the parameters and properties of the material at different temperatures were taken from Euro-code 2. From the analysis it can be inferred that there was no global damage due to impact, heat as well as thermal stress in the wall, but certain local damage was found on the outside of the wall.

中文翻译：

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飞机失事下核电站安全壳的行为

在目前的研究中，一个真实的核电站 (NPP) 外部安全壳结构已被考虑用于安全检查，并且该模型已通过 Abaqus/隐式软件进行模拟。分析中已考虑到三英里岛 (TMI) 安全壳结构。安全壳尺寸为 54.5 m 高（无圆顶）和 45 m 内径。进行了分步分析以评估由于飞机坠毁引发火灾引起的核电厂壁上的应力。在开始时，使用波音 707-320 飞机的力历史曲线将 90 MN 的冲击载荷施加到 NPP 结构上，并且冲击角度被认为与目标垂直。撞击后，节点温度通过使用燃料燃烧引起的喷气燃料曲线的传热分析应用于模型。最后，将冲击效应和传热效应结合起来得到热应力行为。机头和机翼撞击的时间间隔保持在 0.18 秒。在那之后进行了传热分析，因为燃料储存在机翼中。火灾影响最严重的区域是距地基 10 m 高的区域，因为最大的燃料将流向结构的最下方。假设撞击地点位于 TMI 安全壳圆柱形部分的中间高度。分别采用混凝土材料的混凝土损伤塑性模型和钢筋的 Johnson-cook 模型将混凝土行为和钢筋行为结合起来。对于传热和热应力分析，材料在不同温度下的参数和性能取自 Euro-code 2。