Westinghouse Electric Corporation

Hans J Elsner

Raymond P Castner

Ronald F Antol

Calibration apparatus for verifying the position and orientation of transducers used in nuclear reactor vessel inspection apparatus is disclosed. A tank, filled with water, the operating inspection medium, is fitted with a movable mounting assembly adapted to securely accommodate a transducer and the mounting assembly in which it is normally secured during an inspection procedure. The tank is also provided with a slidably mounted target positioned therein at a predetermined distance from the target which is selected to avoid the distortion effects in the near field of the transducer response. The calibration apparatus can be used to check the normal transducer mounting for either perpendicularity or angular orientation by moving the tank's mounting assembly via a lead screw with which it is threadingly engaged.

Positioning calibration apparatus for transducers employed in nuclear

A positionally variable mounting assembly for transducers used to interrogate a nuclear reactor vessel is disclosed. Means are provided for clamping each transducer of an array about its flange in a central restraining block. The central restraining block is, in turn, pivotally mounted in a yoke. The yoke is movable secured to bars or rails bolted to the transducer plate and, by loosening appropriate bolts, can be moved along the ways or pivoted about one of them. Further, the restraining block can be removed from the yoke and pivotally clamped in a different orientation to upstanding brackets attached to the transducer array plate, or rotated through 90.degree. and then secured again in the yoke.

Variable mounting assembly for transducers employed in nuclear reactor

A removable calibration assembly is disclosed which can be utilized to verify the angular mounting of transducers in an array employed in the inspection apparatus, to calibrate one axis of movement of the array with reference to a zero starting point or to measure and calibrate for the speed per unit of distance of the transducer's ultrasonic beam in the actual operating medium. The calibration assembly includes both a relatively infinitely large and a relatively infinitely small reflecting surface separated by known distances and a plurality of truncated cones, the tips of which are machined or adjusted to those angles at which certain of the transducers are to be mounted in the array. In addition, clamping means for securing the calibration assembly to the inspection apparatus at a predetermined orientation is provided.

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Pittsburgh, PA, United States of America

Hans J Elsner