Carbon Steel (CS) piping plays a vital role in the heat transport circuits of power plants. These pipes undergo excessive degradation in some of the specific locations due to the flow dynamics variation and such corrosion is termed as the flow accelerated corrosion (FAC). The corrosion rate is usually estimated at a specific location based on one of the best available technique known as the Think Layer Activation (TLA) method. In the present study this method was adopted for the estimation of CS pipe corrosion with 50NB Sch 160, bend angle of 58° and 4D bend radius (D-pipe diameter). Irradiated location was chosen based on the turbulence patterns in the bend as mapped by CFD analysis. At the specified location the corrosion rate to be monitored was irradiated with the proton beam of 13.3 MeV energy aiming for the nuclear reaction of Fe⁵⁶(p,n) Co⁵⁶. This irradiated specimen was welded to the High Temperature High Pressure (HTHP) loop and operated at 290 °C/87 bar. The chemistry parameters like pH (10.2) and DO (< 5 ppb) in the loop were maintained by suitably adding LiOH and N₂H₄. Corrosion rate was assessed by measuring the radioactivity decrease due to corrosion. Throughout the experimental duration the radioactivity measurement was carried on the CS pipe surface at the fixed distance locations. The flow structure in the considered geometry is simulated using CFD. The flow field, velocity, is used to calculate the wall shear stress and mass transfer coefficient. The corrosion rate is calculated with the help of Chilton-Calbourn Equation. It is observed that the computed corrosion rate for this CS pipe under this chemistry and geometry conditions was 400um/y which coincides with that of the TLA method.

碳钢（CS）管道在发电厂的热传递回路中起着至关重要的作用。这些管道由于流动动力学变化而在某些特定位置发生过度降解，这种腐蚀称为流动加速腐蚀（FAC）。通常根据已知的最佳可用技术之一（思考层激活（TLA）方法）在特定位置估算腐蚀速率。在本研究中，该方法被用于估算50NB Sch 160、58°弯曲角度和4D弯曲半径（D管道直径）的CS管道腐蚀。根据CFD分析所映射的弯道中的湍流模式选择辐照位置。在指定位置，以13.3 MeV能量的质子束辐照要监测的腐蚀速率，以实现Fe的核反应⁵⁶（p，n）Co ⁵⁶。将该辐照过的样品焊接到高温高压（HTHP）回路上，并在290°C / 87 bar下运行。通过适当添加LiOH和N ₂ H ₄来维持回路中的化学参数（如pH（10.2）和DO（<5 ppb））。通过测量由于腐蚀引起的放射性降低来评估腐蚀速率。在整个实验过程中，放射性测量都是在CS管表面上的固定距离位置进行的。使用CFD模拟考虑的几何形状中的流动结构。流场速度用于计算壁面剪应力和传质系数。腐蚀速率借助Chilton-Calbourn方程计算。可以看出，在这种化学和几何条件下，该CS管的计算腐蚀速率为400um / y，与TLA方法一致。