A VISUAL INSPECTION DEVICE OF THE FLOW DISTRIBUTION PLATE BOLTS OF THE STEM GENERATOR FOR NUCLEAR POWER PLANTS

摘要

A device for visually checking a fixing bolt is provided to perform a safe operation of a nuclear power plant by visually confirming an abnormality of a fixing bolt of a flow distribution plate. A device for visually checking a fixing bolt includes a video probe guide part(9) and a direction conversion part. The video probe guide part guides a video probe(3) into a check part. The direction conversion part is attached in an end of the video probe guide part, and converts a direction of the video probe toward the check part by 90 degrees. The video probe is put into a steam generator through a probe guide through hole(15). The probe guide through hole penetrates the video probe guide part and the direction conversion part. The video probe visually checks the fixing bolt of a flow distribution plate.