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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.5: High-Pressure Technology... >NDE ASSESSMENT OF PWSCC IN CONTROL ROD DRIVE MECHANISM HOUSINGS
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NDE ASSESSMENT OF PWSCC IN CONTROL ROD DRIVE MECHANISM HOUSINGS

机译：控制杆驱动机构壳体中PWSCC的NDE评估

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Studies being conducted at the Pacific Northwest National Laboratory (PNNL) in Richland, Washington are focused on assessing the effectiveness of nondestructive examination (NDE) techniques for inspecting control rod drive mechanism (CRDM) nozzles and J-groove weldments. The primary objective of this work is to provide information to the United States Nuclear Regulatory Commission (US NRC) on the effectiveness of NDE methods as related to the in-service inspection of CRDM nozzles and J-groove weldments, and to enhance the knowledge base of primary water stress corrosion cracking (PWSCC) through destructive characterization of the CRDM assemblies. In describing two CRDM assemblies removed from service, decontaminated, and then used in a series of NDE measurements, this paper will address the following questions: 1) What did each technique detect?, 2) What did each technique miss?, and 3) How accurately did each technique characterize the detected flaws? Two CRDM assemblies including the CRDM nozzle, the J-groove weld, buttering, and a portion of the ferritic head material were selected for this study. One contained suspected PWSCC, based on in-service inspection data and through-wall leakage; the other contained evidence suggesting through-wall leakage, but this was unconfirmed. The two CRDMs used in this study were cut from a pressure vessel head that has since been replaced.The selected NDE measurements follow standard industry techniques for conducting in-service inspections of CRDM nozzles and the crown of the J-groove welds and buttering. In addition, laboratory based NDE methods were employed to conduct inspections of the CRDM assemblies, with particular emphasis on inspecting the J-groove weld and buttering. This paper will also describe the NDE methods used and discuss the NDE results. Future work will involve using the results from these NDE studies to guide the development of a destructive characterization plan to reveal the crack morphology and a comparison of the degradation found by the destructive evaluation with the recorded NDE responses.
机译：在华盛顿州里奇兰市的太平洋西北国家实验室（PNNL）进行的研究集中于评估用于检查控制杆驱动机构（CRDM）喷嘴和J型槽焊件的无损检查（NDE）技术的有效性。这项工作的主要目的是向美国核监管委员会（US NRC）提供有关在役检查CRDM喷嘴和J型槽焊件的NDE方法有效性的信息，并增强知识基础通过CRDM组件的破坏性特征来确定一次水应力腐蚀开裂（PWSCC）。在描述两个从服务中移除，被净化，然后用于一系列NDE测量的CRDM组件时，本文将解决以下问题：1）每种技术检测到什么？2）每种技术遗漏了什么？以及3）每种技术表征检测到的缺陷的准确性如何？本研究选择了两个CRDM组件，包括CRDM喷嘴，J型坡口焊缝，黄油和部分铁素体头部材料。根据在役检查数据和穿墙泄漏，其中一架装有可疑的PWSCC；另一个包含暗示穿墙泄漏的证据，但这尚未得到证实。本研究中使用的两种CRDM是从已更换的压力容器头上切割下来的。选定的NDE测量遵循标准的行业技术，以对CRDM喷嘴以及J型槽焊缝和黄油的顶部进行在役检查。此外，还采用了基于实验室的NDE方法对CRDM组件进行检查，尤其着重于检查J型槽焊缝和黄油。本文还将介绍所使用的NDE方法并讨论NDE结果。未来的工作将涉及使用这些无损检测研究的结果来指导破坏性表征计划的开发，以揭示裂纹的形态，并将破坏性评估发现的劣化与已记录的无损检测响应进行比较。

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