Ultrasonic Inspection Process Design for CRDM Pressure Housing Weld in Nuclear Power Plant
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摘要: 控制棒驱动机构（CRDM）耐压壳属于核电厂主回路，其连接焊缝是整个放射性回路压力边界的薄弱环节，其安全性和可靠性直接影响反应堆的安全运行状态。针对CRDM耐压壳焊缝附近空间狭小、壁厚薄、可达性差等特点，本文采用仿真技术设计了一套专用的扁平型双晶聚焦超声探头和检验工艺，试验验证结果满足规程要求，解决了核电厂在役检查的监督难点，并获得了核电厂主回路Ⅰ级部件类似焊缝检验的工艺设计和验证方法。Abstract: The pressure housing of the control rod drive mechanism (CRDM) belongs to the main circuit of the nuclear power plant, and its joint weld is the weak link of the pressure boundary of the whole radioactive circuit. Its safety and reliability directly affect the safe operation state of the reactor. In view of its narrow space, thin wall thickness and poor accessibility, a special flat bicrystal focused ultrasonic probe and inspection process are designed by using simulation technology. The test results meet the requirements of the regulations. The supervision difficulties of in-service inspection of nuclear power plant are solved, and the process design and verification method of similar weld inspection of class I components of main circuit of nuclear power plant are obtained.
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Key words:
- CRDM /
- Ultrasonic inspection /
- Probe design
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图 1 EPR机组CRDM耐压壳和焊缝位置示意图 mm
Figure 1. Schematic Diagram of CRDM Pressure Housing and Weld Position of EPR Unit
图 2 圆柱面对入射角度的影响示意图 mm
Figure 2. Schematic Diagram of the Influence of the Cylindrical Surface on the Incident Angle
图 6 检验方式示意图
上限位、下限位—探头能移动的最大范围位置；X±—周向的2个方向，向里和向外；L—超声纵波
Figure 6. Schematic Diagram of Inspection Method
表 1 超声检测工艺
Table 1. Ultrasonic Inspection Process
序号 探头类型 频率/MHz 角度 楔块形状 检查方向 1 双晶纵波 2 0° AOD147 轴向Y+/Y− 2 双晶纵波 2 45° COD147 周向X+/X− 3 双晶纵波 2 33° COD147 周向X+/X− 4 双晶纵波 2 45° AOD147 轴向Y+/Y− 5 双晶纵波 3 60° AOD147 轴向Y+/Y− AOD147和COD147分别表示沿轴向和周向外径为147 mm弧面的楔块 
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