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首页> 外文会议>Material Degradation and Related Managerial Issues at Nuclear Power Plants >THE KKL PROGRAM FOR THE PREVENTION OF PIPING DEGRADATION DUE TO FLOW-ACCELERATED CORROSION PHENOMENA
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THE KKL PROGRAM FOR THE PREVENTION OF PIPING DEGRADATION DUE TO FLOW-ACCELERATED CORROSION PHENOMENA

机译：防止流动加速腐蚀现象引起的管道退化的KKL程序

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摘要

Flow-accelerated corrosion is a degradation process resulting in wall thinning of piping, vessels and equipment made of carbon or low-alloy steel. Areas suffering from flow-accelerated corrosion are difficult to locate, as this degradation process occurs only locally under specific conditions of flow, water chemistry, temperature and material behavior. For the Swiss NPP Leibstadt (KKL) a systematic screening procedure was applied with the intension to reliably identify system areas, which may be subject to a flow-accelerated corrosion attack. During the screening process the heat balance diagram of the power plant was modeled using the functionality of the COMSY software tool, including system parameters for each relevant system area. Based on this model an analysis of the water chemistry cycle was performed, considering associated thermo-hydraulic parameters. Taking into consideration the materials used in each case, the system areas were studied with respect to the degradation potential imposed by flow-accelerated corrosion. This paper presents the approach to counteract flow-accelerated wall thinning with the help of computerized tools developed by Framatome ANP, which the operator of Leibstadt NPP (KKL) in Switzerland adopted in 1989 in response to regulatory requirements and inquiries. The results of the methodology applied since then with commendable success will be discussed.
机译：流动加速腐蚀是一种降解过程，会导致由碳或低合金钢制成的管道，容器和设备的壁变薄。流动加速腐蚀的区域很难定位，因为这种降解过程仅在特定的流动，水化学，温度和材料行为条件下局部发生。对于瑞士NPP莱布斯塔特（KKL），系统采用了带有内涵的筛选程序，以可靠地识别可能受到流动加速腐蚀攻击的系统区域。在筛选过程中，使用COMSY软件工具的功能对电厂的热平衡图进行建模，包括每个相关系统区域的系统参数。在此模型的基础上，考虑了相关的热液压参数，对水化学循环进行了分析。考虑到每种情况下使用的材料，对系统区域进行了研究，研究了由流动加速腐蚀引起的降解潜力。本文介绍了借助Framatome ANP开发的计算机工具来抵消流动加速壁变薄的方法，该工具由瑞士Leibstadt NPP（KKL）的运营商于1989年采用，以响应法规要求和询问。从那时起所应用的方法学的结果将获得巨大的成功。

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