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首页> 外文期刊>World Journal of Nuclear Science and Technology >Development of a LDIE Prediction Theory in the Condition of Magnetite Formation on Secondary Side Piping in Nuclear Power Plants
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Development of a LDIE Prediction Theory in the Condition of Magnetite Formation on Secondary Side Piping in Nuclear Power Plants

机译：核电厂二次侧磁铁矿形成条件下LDIE预测理论的发展

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It has been thought that wall thinning on the secondary side piping in nu-clear power plants is mostly caused by Flow-Accelerated Corrosion (FAC). Recently, it has been seen that wall thinning on the secondary side piping carrying two-phase flow is caused by not only FAC but also Liquid Droplet Impingement Erosion (LDIE). Moreover, it turns out that LDIE in nuclear power plants does not result from a single degradation mechanism but also from the simultaneous happenings of LDIE and FAC. This paper presents a comparison of the mass loss rate of the tested materials between carbon steel (A106 B) and low alloy steel (A335 P22) resulting from degradation effect. An experimental facility was set up to develop a prediction model for clarifying multiple degradation mechanisms that occur together. The experimental facility allows examining liquid droplet impingement erosion in the same conditions as the secondary side piping in nuclear power plants by generating the magnetite on the surface of the test materials. The magnetite is formed by controlling the water chemistry and the temperature of fluid inside the facility. In the initial stage of the experiments, the mass loss rate of A106 B was greater than that of A335 P22. However, after a certain period of time, the mass loss rate of A335 P22 became greater than that of A106 B. It is presumed that the results are caused by the different yield strengths of the test materials and the different degrees of buffer action of the magnetite deposited on their surfaces. The layer of magnetite on the surface of A106 is thicker than that of A335 P22, due to the different amount of chrome content. In nuclear power plants, carbon steel piping having experienced wall thinning degradation is generally replaced with low-alloy steel piping. However, the materials of pipes carrying two-phase flow should be selected considering their susceptibility to LDIE.
机译：有人认为，核电站二次侧管道壁变薄主要是由流动加速腐蚀（FAC）引起的。近来，已经发现，携带两相流的次级侧管道上的壁变薄不仅是由FAC引起的，而且还由液滴冲击侵蚀（LDIE）引起的。而且，事实证明，核电厂中的LDIE并不是由单一的降解机制引起的，而是由LDIE和FAC的同时发生引起的。本文介绍了由于降解效果而导致的碳钢（A106 B）和低合金钢（A335 P22）的材料质量损失率的比较。建立了一个实验设施来开发一个预测模型，以阐明同时发生的多种降解机理。通过在测试材料表面生成磁铁矿，该实验设备可以在与核电厂二次侧管道相同的条件下检查液滴撞击侵蚀。磁铁矿是通过控制设施内部的水化学和温度来形成的。在实验的初始阶段，A106 B的质量损失率大于A335 P22的质量损失率。但是，经过一段时间后，A335 P22的质量损失率变得大于A106 B的质量损失率。推测结果是由于测试材料的屈服强度不同以及缓冲材料的缓冲作用程度不同所致。磁铁矿沉积在其表面上。由于铬含量的不同，A106表面的磁铁矿层比A335 P22的厚。在核电站中，壁厚变薄退化的碳钢管道通常被低合金钢管道取代。但是，应考虑两相流对LDIE的敏感性选择材料。

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