G.J. Schuster, S.L. Crawford , A.F. Pardini, S.R. Doctor, Pacific Northwest National Laboratory, Richland, USA.
ABSTRACT
Instances of stress corrosion cracking in reactor pressure vessel internal components, especially the BWR core shroud, have been increasing. Results from Inservice inspection are an important aspect of integrity evaluations. One of the major goals of the work described in this paper is to develop methods for quantifying the reliability, probability of detection and sizing error, of ultrasonic inspection methods for reactor internals. A mock-up is described along with its application to the assessment on NDE reliability for inservice inspection of reactor internals. The mock-up, at present, includes cracks in some of the 40 welded assemblies selected to represent specific, known field conditions. The selected material and geometry includes most conditions and alloys used in the core shroud and its support structure. This paper provides an overview of the work being performed and focuses on the parametric study results relating ultrasonic response to inspection effectiveness.
Publication Source: First International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurised Components , 20 - 22 October 1998, Amsterdam, Netherlands. Held by the Joint Research Centre of the European Commission. Publisher:Woodhead Publishing Limited
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