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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.3: Design and Analysis; 20050717-21; Denver,CO(US) >EVALUATION OF THERMAL FLUCTUATIONS AND STRESSESS IN PIPINGS MIXING ZONES
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EVALUATION OF THERMAL FLUCTUATIONS AND STRESSESS IN PIPINGS MIXING ZONES

机译：配管带的热波动和应力评估

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摘要

Following the incident (through-wall crack and crazing zones) of May 1998 on the principal mixing zone of the residual heat removal system at CIVAUX nuclear plant, EDF has initiated a R&D program to understand the incident and assess the risks of damage on other nuclear plants mixing zones. The program includes different sectors of developments: assessment of temperature fluctuations in mixing zones, study of high-cycle thermal fatigue behavior of austenitic steel and development of mechanical methodologies for damage assessment and propagation of crazing zones (thermal striping). The paper develops an attempt to calculate the spatial and temporal variations of fluid thermal fluctuations in a mixing zone, using a Large Eddy Simulation method (LES). Distribution of temperature in the wall is evaluated in the same calculation. This temperature distribution is then used to estimate the stress variations and fatigue damage of the pipe by using finite elements calculation or simplified methods.
机译：1998年5月，CIVAUX核电站余热排除系统的主要混合区发生了事故（贯穿墙的裂缝和裂缝），法国电力公司启动了一项研发计划，以了解事故并评估对其他核装置造成损害的风险植物混合区。该计划包括不同的发展领域：评估混合区的温度波动，研究奥氏体钢的高循环热疲劳行为以及开发用于损伤评估和裂纹扩展（热剥离）的机械方法。本文尝试使用大涡模拟方法（LES）计算混合区中流体热涨落的时空变化。在同一计算中评估壁中的温度分布。然后，通过使用有限元计算或简化方法，将该温度分布用于估算管道的应力变化和疲劳损伤。

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