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首页> 外文期刊>Thermal engineering >Local Flow-Accelerated Corrosion of Welds in NPP Power Unit Pipelines: Phenomenon Mechanism Features and Measures to Prevent Damage
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Local Flow-Accelerated Corrosion of Welds in NPP Power Unit Pipelines: Phenomenon Mechanism Features and Measures to Prevent Damage

机译：NPP机组管道焊缝的局部加速腐蚀：现象机理特征及防止损坏的措施

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Abstract— Flow-accelerated corrosion of metal caused by single- or two-phase flow of working fluid leads to thinning and destruction of welds in NPP power unit pipelines. Field experience gained from the operation of Russian and foreign nuclear power plants testifies that there have been many cases of damages inflicted to welds due to local flow-accelerated corrosion, the number of which tends to grow with the time for which the power units have been in operation. The article gives examples of the most typical places and characteristic features pertinent to the way in which the flow-accelerated corrosion of weld elements' metal takes place. The role and influence of the chemical composition of the weld metal and heat-affected zone metal on the location and rate of local flow-accelerated corrosion thinning in welds are determined. The flow hydrodynamic characteristics having an essential effect on the rate of flow-accelerated corrosion processes and the local thinning occurrence places are determined. Results from numerical modeling of the flow-accelerated corrosion weld thinning development process for different contents of chromium in the weld and heat-affected zone metal are given. The possibility of increasing the flow-accelerated corrosion rate in pipelines downstream of a weld with a preceding extended straight pipeline segment made of metal not prone to flow-accelerated corrosion is analyzed. Methods aimed at preventing the occurrence of damage to pipelines of NPP power units due to flow-accelerated corrosion are discussed. The article gives information on the results of activities for modifying the standard programs for in-service inspection of pipelines at VVER-based NPPs and also on the use, at Russian NPPs, of software systems providing support to the personnel on optimizing the arrangement and scheduling of in-service monitoring of flow-accelerated corrosion wear of heat-affected zones in welds of the pipelines used at NPP power units equipped with VVER-440, VVER-1000, and BN-600 reactors. It can be expected that the application of regularly updated software systems for supporting the personnel will make it possible to timely prevent inadmissible thinning and abrupt flow-accelerated corrosion-induced failures of pipeline welds in the power units of Russian nuclear power plants.
机译：摘要—由工作流体的单相或两相流引起的金属加速腐蚀会导致NPP动力装置管道中的焊缝变薄和破坏。从俄罗斯和外国核电厂的运行中获得的现场经验证明，由于局部流动加速腐蚀而造成的焊缝损坏案例很多，而且随着发电装置使用时间的增加，这种损坏的数量往往会增加在运作中。本文提供了与焊接元件的金属流动加速腐蚀发生方式有关的最典型位置和特征的示例。确定了焊缝金属和热影响区金属的化学成分对焊缝中局部流动加速腐蚀减薄的位置和速率的作用和影响。确定了对流体加速腐蚀过程的速率和局部变薄发生位置具有重要影响的流动流体力学特性。给出了焊缝和热影响区金属中铬含量不同的流动加速腐蚀焊缝薄化发展过程的数值模型结果。分析了增加焊缝下游管道中流动加速腐蚀速率的可能性，该焊接下游管道的先前延伸的直管段由不易产生流动加速腐蚀的金属制成。讨论了旨在防止由于流加速腐蚀而对NPP动力装置的管道造成损坏的方法。本文提供了有关修改基于VVER的NPP的管道在役检查标准程序的活动结果以及在俄罗斯NPP使用软件系统的信息，这些软件为人员提供了优化布置和调度的支持装有VVER-440，VVER-1000和BN-600反应堆的NPP动力装置所使用的管道焊缝中热影响区的流动加速腐蚀磨损的在线监测的分析。可以预期，使用定期更新的软件系统以支持人员，将有可能及时防止俄罗斯核电厂动力装置中管道焊接的变薄和流动加速腐蚀引起的腐蚀故障。

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