INSPECTION DEVICE FOR INSIDE OF REACTOR

摘要

PURPOSE:To observe easily the intactness of welding part of a reactor pressure vessel from inside. CONSTITUTION:On the upper part of a reactor pressure vessel 1, an azimuthal dolly 11 is placed and on the azimuthal dolly 11 a radial dolly 13 is placed. On the radial dolly 13, a lower mast 14 and an upper mast 16 to support a part of the mast 15 is fixed as to be free of extension up and down direction. In this case, the part of the mast 15 is fixed with a shift to the reactor pressure vessel body 1 side against the mast 16 and the lower mast 14 is fixed as to shift to the reactor pressure vessel body 1 side against the mast 15. And at the lower end of the lower mast 14, an ultrasonic sensor 18 is fixed below the lower mast 14.