防振条(AVB)位于核电设备蒸汽发生器(SG)传热管束的弯管区,用于支承SG传热管束并抑制运行期间管束的流致振动,保证传热管运行的安全性。依据某AP 1000核电厂的要求,为了确定AVB的状态与安装时相比是否发生了明显变化,研制了满足检测技术要求的视频检测设备,对AVB实施视频检测,并为传热管涡流检测可能发现的“接近管信号”提供补充验证。该方法在工程实践中得到成功应用,为核电站蒸汽发生器传热管防振条的在役检查提供了一些参考。

Anti-vibration bar (AVB) is located in the bend area of the heat transfer tube bundle of the steam generator (SG) of the nuclear power equipment. It is used to support the SG heat transfer tube bundle and suppress the flow-induced vibration of the tube bundle during operation, so as to ensure the safety of the heat transfer tube operation. According to the requirements of an AP 1000 nuclear power plant, in order to determine whether the status of AVB changed significantly compared to the time of installation, a video equipment meeting the technical requirements of detection was developed, video detection of AVB was carried out, and supplementary verification was provided for the "proximity tube signal" that may be found in eddy current detection of heat transfer tubes. The method was successfully applied in engineering practiced and provided some references for in-service inspection of the anti-vibration bars of the steam generator tubes in nuclear power plants.