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首页> 外文期刊>Corrosion Science and Technology >Cause Analysis for the Wall Thinning and Leakage of a Small Bore Piping Downstream of an Orifice
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Cause Analysis for the Wall Thinning and Leakage of a Small Bore Piping Downstream of an Orifice

机译：孔板下游小口径管壁变薄和泄漏的原因分析

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摘要

A number of components installed in the secondary system of nuclear power plants are exposed to aging mechanisms such as FAC (Flow-Accelerated Corrosion), Cavitation, Flashing, and LDIE (Liquid Droplet Impingement Erosion). Those aging mechanisms can lead to thinning of the components. In April 2013, one (1) inch small bore piping branched from the main steam line experienced leakage resulting from wall thinning in a 1,000 MWe Korean PWR nuclear power plant. During the normal operation, extracted steam from the main steam line goes to condenser through the small bore piping. The leak occurred in the downstream of an orifice. A control valve with vertical flow path was placed on in front of the orifice. This paper deals with UT (Ultrasonic Test) thickness data, SEM images, and numerical simulation results in order to analyze the extent of damage and the cause of leakage in the small bore piping. As a result, it is concluded that the main cause of the small bore pipe wall thinning is liquid droplet impingement erosion. Moreover, it is observed that the leak occurred at the reattachment point of the vortex flow in the downstream side of the orifice.
机译：安装在核电站二次系统中的许多组件都受到老化机制的影响，例如FAC（流动加速腐蚀），气蚀，闪蒸和LDIE（液滴撞击）。这些老化机制可能导致组件变薄。 2013年4月，在1000 MWe韩国压水堆核电站，从主蒸汽管线分支的一（1）英寸小口径管道因壁薄而泄漏。在正常运行期间，从主蒸汽管线提取的蒸汽通过小口径管道进入冷凝器。泄漏发生在孔口的下游。具有垂直流路的控制阀放在孔口的前面。为了处理小口径管道的损坏程度和泄漏原因，本文处理了UT（超声波测试）厚度数据，SEM图像和数值模拟结果。结果，得出结论，小口径管壁变薄的主要原因是液滴撞击侵蚀。此外，观察到在孔的下游侧的涡流的再结合点处发生泄漏。

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