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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) >DEVELOPMENT OF GUIDELINES FOR THERMAL LOAD MODELING
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DEVELOPMENT OF GUIDELINES FOR THERMAL LOAD MODELING

机译：热负荷建模指南的开发

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Conceptual design studies of Japanese commercialized fast reactors are now carried out as "Feasibility Study on Commercialized FR Cycle Systems". Aiming for economical improvement, these plants adopt innovative design, which leads to make thermal loads more severe. To certify the design concepts and validate structural integrity, research and development of Fast Reactor Structural Design Standard (FDS) for commercialized fast reactor components is now under way. Among them, a set of guidelines for thermal load modeling is under development to overcome above thermal problems. System thermal transient loads sometimes become critical for plant design. Prediction of these loads has difficulties because many influence factors exist. So that, two kinds of modeling methods are recommended. One is the multi-linear approximation method to envelop scatter of those factors. Another is a combination method of thermal hydraulic-structure total analysis and the Design of Experiments. This method can grasp relation between influence factors and induced thermal stress without conservative design factors. Furthermore, screening method prior to modeling is provided. In actual plants, high cycle fatigue failure sometimes occurred, due to thermal striping phenomenon. The guidelines also deal with the modeling method of thermal striping loads. For consideration of attenuation mechanism of temperature fluctuation, a frequency response function of thermal stress is utilized. This function enables us to evaluate sensitivities of thermal stress to frequencies of temperature fluctuation, constraint conditions of components etc.
机译：现在，将日本商业化快堆的概念设计研究作为“商业化FR循环系统的可行性研究”进行。为了经济上的改善，这些工厂采用了创新的设计，这使得热负荷更加严重。为了验证设计概念并验证结构完整性，目前正在进行针对商业化快速反应堆组件的快速反应堆结构设计标准（FDS）的研究和开发。其中，正在开发一套用于热负荷建模的准则，以克服上述热问题。系统热瞬态负载有时对于工厂设计至关重要。由于存在许多影响因素，因此很难预测这些载荷。因此，建议使用两种建模方法。一种是采用多线性逼近方法来包围这些因素的分散。另一种是热工水力结构总分析和实验设计的组合方法。该方法无需保守的设计因素即可掌握影响因素与感应热应力之间的关系。此外，提供了建模之前的筛选方法。在实际的工厂中，由于热剥离现象，有时会发生高周疲劳故障。该准则还涉及热剥离载荷的建模方法。考虑到温度波动的衰减机理，利用了热应力的频率响应函数。此功能使我们能够评估热应力对温度波动频率的敏感性，组件的约束条件等。

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