Development of ToSPACE for Pipe Wall Thinning Management in Nuclear Power Plants

K. Hwang, Hun Yun, Hyeok Seo, G. Lee, Kyung Woo Kim
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引用次数: 6

Abstract

A number of piping components in the secondary system of nuclear power plants are exposed to aging mechanisms such as FAC (Flow-Accelerated Corrosion), cavitation, flashing, SPE (Solid Particle Erosion), LDIE (Liquid Droplet Impingement Erosion), etc. Those mechanisms may lead to thinning, leak, or rupture of the components. Due to the pipe ruptures caused by wall thinning in Surry unit 2 of USA in 1986 and in Mihama unit 3 of Japan in 1994, the pipe wall thinning management has emerged as one of the most important issues in nuclear power plants. To manage the pipe wall thinning in the secondary system, Korea has used a foreign program since 1996. As using the foreign country’s program for long term, it was necessary to improve from the perspective of the users. Accordingly, KEPCO-E & C has started to develop the 3D-based pipe wall thinning management program (ToSPACE, Total Solution for Piping And Component Engineering management) from eight years ago, and the development was successful. This paper describes the major functions included in ToSPACE program, such as 3D-based DB (Database) buildup, development of FAC and erosion evaluation theories, UT (Ultra-sonic Test) data reliability analysis, field connection with 3D, automatic establishment of long-term inspection plan, etc. ToSPACE program was developed to allow site engineers performing the selection of inspection quantity at each refueling outage, UT data reliability analysis, UT evaluation, determination of next inspection timing, identification of the inspecting and replacing components in 3D drawings, etc., to access easily.
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ToSPACE在核电厂管壁减薄管理中的开发
核电站二次系统中的许多管道部件都面临着FAC(流动加速腐蚀)、空化、闪蒸、SPE(固体颗粒侵蚀)、LDIE(液滴撞击侵蚀)等老化机制。这些机制可能导致部件变薄、泄漏或破裂。由于1986年美国萨里2号机组和1994年日本三滨3号机组的管壁变薄导致的管道破裂,管壁变薄管理成为核电站最重要的问题之一。从1996年开始,为了管理二级系统的管壁变薄问题,韩国采用了国外的方案。由于长期使用国外程序,需要从用户的角度进行改进。因此,kepco - e&c从8年前开始开发基于3d的管壁减薄管理程序(ToSPACE,管道和部件工程管理总解决方案),并取得了成功。本文介绍了ToSPACE项目所包含的主要功能,如基于3D的DB(数据库)建立、FAC和侵蚀评估理论的发展、UT(超声波测试)数据可靠性分析、与3D的现场连接、自动建立长期检测计划等。开发ToSPACE程序是为了方便现场工程师在每次换料停机时选择检查数量、UT数据可靠性分析、UT评估、确定下一次检查时间、识别3D图纸中的检查和更换部件等。
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