Automation of the procedure for determining the admissibility of erosion- corrosion wear in pipelines of nuclear power plants made of carbon steels

Hryhoriy Vorona, Mykyta Ananchenko, Oleh Makhnenko
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Abstract

Many pipelines in Ukrainian nuclear power plants have been in operation for over 30 years, and the determination of the admissibility of erosion-corrosion wear (ECW) defects in the pipeline wall metal is currently one of the pressing issues in the nuclear energy sector of Ukraine. A comparative analysis of determining the admissibility of pipe wall thinning due to ECW was conducted using the adopted methodology “MT-T.0.03.224-18” by the State Enterprise “Energoatom” and the guidance based on the use of regulatory documents for designing pipeline elements. The use of the methodology demonstrated significant advantages in terms of reducing the conservatism of ECW assessment, especially for small-scale thinning and pipelines operating at pressures below 60-80 kgf/cm2, which allows for a substantial reduction in repair work. However, the implementation of the methodology in practice may encounter difficulties due to the complexity and labor-intensiveness of the calculation assessment procedure for nuclear power plant personnel. Therefore, to automate the ECW admissibility assessment in accordance with the methodology requirements, software (SW) was developed for use by nuclear power plant personnel, enabling the prompt generation of a protocol for the express assessment procedure of ECW admissibility for a straight section of the pipeline based on the measurement results of wall thinning parameters in the axial direction. The software allows for concluding whether the section can be put into operation, sent for repair, or requires further refined assessment. Additionally, software based on the finite element method (FEM) was developed, which, when necessary, allows for a refined assessment of a straight section, taking into account the depth and angle of thinning in the circumferential direction, and calculates the stress of the limit plastic state of the pipeline section with ECW from the perspective of viscous fracture. The devel- opment is applicable in the field of nuclear energy in Ukraine.
核电厂碳钢管道腐蚀磨损容许度测定程序的自动化
乌克兰核电站的许多管道已经运行了30多年,管道壁金属腐蚀磨损(ECW)缺陷的可容许性的确定是目前乌克兰核能部门迫切需要解决的问题之一。采用国有企业“Energoatom”采用的“MT-T.0.03.224-18”方法和基于使用监管文件设计管道元件的指南,对ECW引起的管壁减薄的可接受性进行了比较分析。在降低ECW评估的保守性方面,该方法的使用显示出显著的优势,特别是对于小规模减薄和压力低于60-80 kgf/cm2的管道,这可以大大减少维修工作。然而,由于核电厂人员计算评估程序的复杂性和劳动密集性,该方法在实践中的实施可能会遇到困难。因此,为了按照方法学要求实现ECW可采性评估的自动化,开发了供核电站工作人员使用的软件(SW),能够根据轴向壁薄参数的测量结果,迅速生成直线段管道ECW可采性的快速评估程序协议。该软件可以判断该段是否可以投入运行、送修或需要进一步精细化评估。此外,开发了基于有限元法的软件,在必要时可以对直线段进行精细化评估,考虑周向减薄的深度和角度,并从粘性断裂的角度计算ECW管段极限塑性状态的应力。该开发成果适用于乌克兰的核能领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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