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首页> 外文会议>12th International Conference on Environmental Degradation of Materials in Nuclear Power Systems: Water Reactors 2005 vol.2 >CRACKING OF ALLOY 600 NOZZLES AND WELDS IN PWRs: REVIEW OF CRACKING EVENTS AND REPAIR SERVICE EXPERIENCE
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CRACKING OF ALLOY 600 NOZZLES AND WELDS IN PWRs: REVIEW OF CRACKING EVENTS AND REPAIR SERVICE EXPERIENCE

机译：压水堆中的600合金喷嘴和焊缝的开裂：开裂事件和维修服务经验的回顾

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Alloy 600 and its compatible weld metals, Alloys 182 and 82, are present in various pressure boundary locations in pressurized water reactors. Similarly, more corrosion resistant Alloy 690 and its weld metals, Alloys 52, 52M and 152, are increasingly present in PWR pressure boundary applications because of repair, replacement or new construction. Depending upon the specific plant designs, these applications are in one or more of the following major components: main loop piping, reactor vessel upper and lower heads, steam generators and pressurizers. Since 1986, service induced cracking of Alloy 600 nozzles and welds, frequently resulting in primary coolant leakage, has become an increasingly common occurrence resulting in the need to repair or replace nozzles and welds or to replace major components (e.g., reactor vessel heads).rnThis paper updates previous reviews by the authors of Alloy 600/182/82 service-induced cracking events. Recognizing the importance of repairs/replacements and the use of alternative and more corrosion resistant materials, the paper reviews the histories of activities such as replacement-in-kind, pressure boundary relocations with half-nozzle repairs and use of mechanical repairs that leave the cracked nozzles in place. The paper addresses briefly approaches used to evaluate flaws left in place and corrosion of carbon/low alloy steels exposed to coolant as the result of repairs. The paper also reviews the service history of materials used in repairs or replacements, including Alloy 600 with enhanced heat treatments, Alloy 182, Alloy 690 and weld metals Alloy 52, 52M and 152.
机译：合金600及其兼容的焊接金属182和82存在于压水反应堆的各个压力边界位置。同样，由于维修，更换或新构造，在PWR压力边界应用中越来越多地使用更具耐腐蚀性的690合金及其焊接金属52、52M和152。根据具体工厂的设计，这些应用将用于以下主要组件中的一个或多个：主回路管道，反应堆容器的上，下压头，蒸汽发生器和增压器。自1986年以来，服务引起合金600喷嘴和焊缝的开裂，经常导致一次冷却剂泄漏，这一现象越来越普遍，导致需要维修或更换喷嘴和焊缝或更换主要部件（例如反应堆容器的头部）。 rn本文更新了Alloy 600/182/82合金服务诱发的开裂事件的作者先前的评论。认识到维修/更换的重要性以及使用替代材料和更耐腐蚀的材料的重要性，本文回顾了各种活动的历史，例如实物替换，半喷嘴维修的压力边界重定位以及使用留下裂缝的机械维修。喷嘴到位。本文简要介绍了一些方法，这些方法用于评估由于维修而留下的缺陷和暴露于冷却剂的碳/低合金钢的腐蚀。本文还回顾了用于维修或更换的材料的服务历史，包括经过增强热处理的合金600，合金182，合金690和焊接金属52、52M和152。

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