反应堆压力容器封头螺栓作为核设备的重要部件,RSEM标准要求在役前及在役阶段对其进行超声波检测。这是个多系统配合的过程,必须依赖专用超声波检查系统、机械扫查器和控制系统的统一协作才能完成。介绍了改进型压水堆反应堆压力容器封头螺栓超声波检测技术、检测的部位、探头的选用、仪器的选用以及扫查方式、采集系统和分析系统。经实际扫查试验，证明该系统满足改进型压水堆反应堆压力容器封头螺栓超声波检测需求。

Reactor pressure vessel bolt is one of the important parts of nuclear equipments. The pre-service or in-service ultrasonic inspection is needed according to RSEM standard. This inspection can be finished by several system including ultrasonic inspection system, mechanism scanning system and control system. The article introduces the inspection feasibility of improved reactor pressure vessel bolt, the inspection position, the choice of probe, instrument and scanning method, acquirement and analysis system. The testing result is accordant with the request of ultrasonic inspection of improved reactor pressure vessel bolt.