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[en] The in-service inspection of nuclear facilities should make it possible to detect all flaws capable of deterioration. The size of a flaw is not normally characteristic of its seriousness: a large, stable defect which is not developing is of no importance for the safety of the facility whereas a small but developing defect may be dangerous and hence of importance for safety. It is essential to detect all defects, so that any development they may be undergoing can be assessed, and to use, for that purpose, a technique with a maximum detection probability; but the main thing is to characterize all developing defects. For the in-service inspection of pressurized-water reactor vessels the ''Commissariat a l'Energie Atomique'' has conducted studies on inspection methods with a view to ensuring first the best possible detection and secondly the best possible characterization of flaws. Since 1973 many publications have appeared on the subject and this paper will only recall the essentials giving particular attention however to the characterization of defects, which is the principal purpose of the studies currently being conducted. (orig.)
Journal
[en] Focussed transducers specially developed for the sizing of subcladding cracks shows considerable promise for field application. With this type of transducers, the tip diffraction is enhanced. Associated with immersion testing they allow a high speed of inspection with high reliability. Results obtained are independant from operator and reproducible
Source
Wadley, H.N.C; p. 77-81; ISBN 0-87170-192-8; 
; 1985; p. 77-81; American Society of Metals; Metals Park, OH (USA); 6. international conference on nondestructive evaluation in the nuclear industry; Zurich (Switzerland); 27 Nov - 2 Dec 1983
; 1985; p. 77-81; American Society of Metals; Metals Park, OH (USA); 6. international conference on nondestructive evaluation in the nuclear industry; Zurich (Switzerland); 27 Nov - 2 Dec 1983
[en] As part of the DDT programme to evaluate the nondestructive testing methods used during the in-service inspection (ISI) of PWR vessels, the UKAEA asked the CEA-STA-SCND to perform the ultrasonic examination of two test-plates. Each plate was bisected across its full width by a full-thickness butt-weld in which calibrated defects of various natures, dimensions, orientations have been inserted. It was required that the implementation of control, the equipment and the subsequent data analysis represent as nearly as possible the French procedure in force during the pre-service and in-service inspection of a PWR vessel. As suggested by the UKAEA, to evaluate the influence of examiners on the results, the examinations have been carried out twice by two independent teams: one from the CEA-STA-SCND and the second from INTERCONTROLE (a CEA subsidiary company). Procedure and results are given. (author)
Journal
British Journal of Non-Destructive Testing; ISSN 0007-1137; ; v. 25(5); p. 258-262
; v. 25(5); p. 258-262
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