核电厂BOSS焊缝在线堆焊修复相控阵超声检验技术

核电厂反应堆换料水池与乏燃料水池冷却和处理系统（PTR）及设备循环冷却系统（RRI）中含有大量管座接头（BOSS）焊缝，其安全性和可靠性直接影响所存储核燃料的安全状态，对其进行缺陷排查和在线修复是核电厂在役检查监督的重点和难点。本文针对BOSS焊缝在线堆焊修复的特殊要求和检验难点以及射线检验的局限性，设计了一套专用的相控阵超声探头和检验工艺，试验验证结果满足堆焊修复要求，并制订了核电厂BOSS焊缝堆焊修复无损检验的方法和在役检查监督的策略。

Phased Array Ultrasonic Inspection Technology for BOSS Weld Overlaying Repair in Nuclear Power Plant

Nuclear power plant reactor refueling pool and spent fuel pool cooling and treatment system (PTR) and equipment circulating cooling system (RRI) contain a large number of BOSS welds, whose safety and reliability directly affect the safety status of stored nuclear fuel. Defect troubleshooting and on-line repair are the key points and difficulties of in-service inspection and supervision of nuclear power plants. In this paper, a set of special phased array ultrasonic probe and inspection process are designed to meet the special requirements and inspection difficulties of online overlaying repair of BOSS weld and the limitations of radiographic inspection. The test results meet the requirements of overlaying repair, and the nondestructive inspection methods and in-service inspection and supervision strategies for BOSS weld overlaying repair in nuclear power plants are formulated.