Experience on ultrasonic inspection of control rod nozzles of pressurised water reactor pressure vessel

Authors: Kauppinen, P.; Jeskanen, H.; Paussu, R.; Elsing, B.

Source: Energy Materials: Materials Science and Engineering for Energy Systems, Volume 2, Number 2, June 2007 , pp. 129-132(4)

Publisher: Maney Publishing

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Abstract:

An ultrasonic inspection technique developed by VTT to assess the integrity of control rod nozzles to the reactor pressure vessel head is described. A variant of wall thickness measurement, the technique is based on detecting the presence of water in the air gap between the ferritic nozzle and the austenitic steel corrosion protection tube, which can lead to corrosion of the nozzle. The presence of water allows propagation of the pulse across the gap, generating multiple echos, allowing leaks to be identified. The basis and practical application of the technique is described and its limitations discussed.

Document Type: Case Report

DOI: http://dx.doi.org/10.1179/174892407X260659

Publication date: 2007-06-01

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From volume 5 onwards, Energy Materials is published as a virtual journal covering current research on materials for energy generation and storage drawn from the journals of the Institute of Materials, Minerals and Mining. The content reflects the broad range of materials contributions within this increasingly important sector and serves as a focus for the growing community with an interest in energy materials research and applications.
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