SUPERSONIC PROBE

PURPOSE:To enable a flaw to be detected from an inside of a nuclear reactor container and reliability of inspection to be improved by adding a vibrator with a refractive angle of 70 degrees using a vertical or a horizontal wave to a vibrator with refractive angles of 0, 45, and 60 degrees for performing supersonic flaw detection from four angles. CONSTITUTION:Bisected type vibrators 5 and 6 with a refractive angle of 0 degrees for vertical flaw detection are fitted to the center and bisected type vibrators 7 and 8 with a refractive angle of 70 degrees for performing a skew flaw detection are fitted to the same shoe at the rear part and then one- detection type vibrators 11 and 14 with refractive angles of 45 and 60 degrees are placed along side. Then, supersonic beams 17 and 20 with 0 and 70 degrees are projected along A-A surface and supersonic beams 18 and 19 with 45 and 60 degrees are projected along B-B surface and C-C surface. In this manner, by transmitting a supersonic beam with a refractive angle of 70 degrees which is suited for detection of a crack which is produced at a clad part within a container, it becomes possible to perform detection of flaw according to four angles from an inside of a container and to improve inspection reliability.