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首页> 外文会议>Material Degradation and Related Managerial Issues at Nuclear Power Plants >GUIDELINE FOR MANAGEMENT OF PIPING WALL THINNING IN PWR SECONDARY SYSTEMS IN JAPAN
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GUIDELINE FOR MANAGEMENT OF PIPING WALL THINNING IN PWR SECONDARY SYSTEMS IN JAPAN

机译：日本PWR二次系统中管道壁薄管理指南

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摘要

In the early 1980s, when some PWR plants in Japan experienced steam leakage due to piping erosion/corrosion, PWR-operating utilities in Japan responded to the problem of secondary system pipe wall thinning by launching a systematic investigation of pipe wall thickness at their PWR plants paying due attention to fluid flow conditions and pipe configurations. The Guideline sets rules for the wall thinning management for carbon steel pipes in PWR secondary systems by stipulating the inspection method, inspection targets, inspection frequency, acceptance criteria, corrective actions (pipe replacement) and so on. With regard to inspection frequency, the Guideline stipulates that the remaining service life (period of time remaining until a pipe is thinned to the calculated minimum thickness requirement) should be determined and that inspection activities should be continued until the remaining service life decreases to two years. Pipes found to have a remaining service life of two years or less require corrective action. PWR utilities in Japan checked the piping thickness of the components that are required to be inspected in a well-planned manner based on the Guideline. Even after the recent secondary system pipe rupture accident at the Mihama Nuclear Power Station Unit 3, the Guideline is regarded by the Japanese regulatory authorities to be "suitable as a management program in general." However, it is pointed out that the utilities should establish a new private-sector guideline for pipe thickness management based on accumulated measurement data and latest knowledge from overseas in order to ensure more strict control over pipe wall thinning. Now, the Japan Society of Mechanical Engineers (JSME) is currently developing of a new private-sector guideline for pipe thickness management.
机译：在1980年代初期，当日本的一些压水堆工厂由于管道腐蚀/腐蚀而出现蒸汽泄漏时，日本的压水堆运营公用事业公司通过对压水堆工厂的管壁厚度进行系统的调查，来应对二次系统管壁变薄的问题。充分注意流体流动条件和管道配置。该准则通过规定检查方法，检查目标，检查频率，验收标准，纠正措施（管道更换）等，为压水堆二次系统中的碳钢管的壁薄管理设定了规则。关于检查频率，该准则规定，应确定剩余使用寿命（直到将管道变薄至所计算的最小厚度要求为止的剩余时间），并应继续进行检查活动，直到剩余使用寿命减少到两年为止。剩余使用寿命为两年或更短的管道需要采取纠正措施。日本的PWR公用事业公司根据指南，以精心计划的方式检查了需要检查的组件的管道厚度。即使在最近的美滨核电站3号机组发生二次系统管道破裂事故后，该准则也被日本监管机构认为“总体上适合作为管理程序”。但是，需要指出的是，公用事业公司应基于积累的测量数据和国外最新知识，为管道厚度管理建立新的私营部门指南，以确保更严格地控​​制管道壁变薄。现在，日本机械工程师协会（JSME）目前正在开发一种新的私营部门的管道厚度管理指南。

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