Abstract
An automated scanner of an ultrasonic brobe and its controller have been developed for the bottom head weld line of pressure vessel of Advanced Boiling Water Reactor (ABWR). In case of using the traditional scanning mechanism, internal pump casing and housing of control rod driving mechanism prevent an ultrasonic probe from scanning inspection zone. So it is difficult to apply it to that of ABWR.The features of the equipment; (1) a compact scanner using seven staged telescope type arm, (2) collision avoidance control with a touch sensor installed at the top of the telescopic arm, which is necessary to avoid collisions with obstacles such as internal pump housings control rod drives etc., (3) multiplexed data transmission by optical fibers, reducing the number of cables between the scanner and the controller. The equipment was successfully demostrated on a partial model of the full scale pressure vessel by optical fibers.This development was performed by the joint program of the Japan Atomic Power Co., the Toohoku Electric Power Co., the Tokyo Electric Power Co., the Chubu Electric Power Co., the Hokuriku Electric Power Co., the Chugoku Electric Power Co. and Hitachi, Ltd.
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