Abstract: A reference block for determining the characteristics of individual ultrasonic transducers contained within right circular cylinder type ultrasonic probes. Right circular cylinder type ultrasonic probes are designed for performing ultrasonic inspections of components that can only be examined from within a center line access hole. The reference block is made from the same material as that of the right circular cylinder type components which will be examined using the ultrasonic probe being characterized and is designed with curved contact surfaces that specifically duplicate the surfaces of those components. This reference block can be used to calibrate instruments prior to contact inspection using angle-beam search units. The reference block is also useful for checking the performance of both angle-beam and straight-beam search units and for evaluating instrument performance.

Abstract: A system for on-site, non-destructive examination of the seam welds or other portions of the walls of a vessel, for example, a nuclear reactor pressure vessel, including an instrument carrying, remotely controlled vehicle with magnetic adherence means which may be selectively propelled to any position on the walls of the vessel and including an ultrasonic signal system utilizing a triangulation technique for remotely indicating the position of the vehicle on the vessel.

Abstract: A system for on-site, non-destructive examination of the seam welds or other portions of the walls of a vessel, for example, a nuclear reactor pressure vessel, including an instrument carrying, remotely controlled vehicle with magnetic adherence means which may be selectively propelled to any position on the walls of the vessel and including an ultrasonic signal system utilizing a triangulation technique for remotely indicating the position of the vehicle on the vessel.

Abstract: Apparatus for on-site, non-destructive examination of the connection of a pipe to a vessel including a vessel-to-nozzle and nozzle-to-pipe weld seams, including an instrument carrying, remotely controlled vehicle with magnetic adherence means for scanning such connection.