The Latch Housing of the control rod drive mechanism is an SC-1 level safety component in nuclear power equipment.The ultrasonic testing during the manufacturing stage is limited by theprocess requirements and can only be carried out under thethick wall tubular forgings,which is difficulttoinspect.Through theoretical analysis of sound beam path and testblock verification,this paper conducts research on the methodofsmall angle oblique longitudinal wave circumferential detection,and verifies the effectiveness of defect detection through metallographic dissection,which providing reference for promotion and applica-tion to practical engineering projects.
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