• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International topical meeting on nuclear plant instrumentation, control, and human-machine interface technologies >Enhancing the Nondestructive Evaluation of Concrete Structures in Nuclear Power Plants
【24h】

Enhancing the Nondestructive Evaluation of Concrete Structures in Nuclear Power Plants

机译：加强核电厂混凝土结构的无损评估

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Materials issues are a key concern for the existing nuclear reactor fleet as material degradation can lead to increased maintenance, increased downtime, and increased risk. E xtending reactor life to 60 y ears and beyond will likely increase susceptibility and severity of known forms of degradation. A dditionally, new mechanisms of materials degradation are also possible. A multitude of concrete-based structures are typically part of a light water reactor (LWR) plant to provide foundation, support, shielding, and containment functions. Concrete has been used in the construction of nuclear power plants (NPPs) because of three primary properties: its inexpensiveness, its structural strength, and its ability to shield radiation. With respect to the concrete structures, age-related degradation may affect engineering properties, structural resistance/capacity, failure mode, and location of failure initiation that in turn may affect the ability of a structure to withstand challenges in service. This paper examines the benefits of using time-frequency analysis with Synthetic Aperture Focusing Technique (SAFT). SAFT is an image reconstruction technique commonly used in conjunction with ultrasonic arrays. By using wavelet packet decomposition, the original ultrasound signals are decomposed into various frequency bands. Selected frequency bands are then reconstructed back into a time-series data set. This facilitates highly selective analysis of the signal's frequency content and can be visualized using the familiar and reliable SAFT image reconstruction algorithm. Additionally, this paper briefly examines the benefits of using the Total Focusing Method (TFM) as compared to SAFT.
机译：材料问题是现有核反应堆船队的主要关切，因为材料降解可能导致维护增加，停机时间增加和风险增加。将反应堆寿命延长至60年甚至更长时间，可能会增加已知降解形式的敏感性和严重性。另外，也可以使用新的材料降解机制。轻型反应堆（LWR）厂通常会使用多种混凝土结构来提供地基，支撑，屏蔽和围护功能。由于三个主要特性，混凝土已用于核电站（NPP）的构造：其便宜，结构强度和屏蔽辐射的能力。对于混凝土结构，与年龄相关的退化可能会影响工程性能，结构抗力/承载能力，破坏模式以及破坏引发的位置，进而可能会影响结构承受服务挑战的能力。本文探讨了使用合成孔径聚焦技术（SAFT）进行时频分析的好处。 SAFT是通常与超声阵列结合使用的图像重建技术。通过使用小波包分解，原始的超声信号被分解成各种频带。然后将选定的频带重新构建回时序数据集。这有助于对信号的频率内容进行高度选择性的分析，并且可以使用熟悉且可靠的SAFT图像重建算法将其可视化。此外，本文简要分析了使用总聚焦方法（TFM）与SAFT相比的优势。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号