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AbstractAbstract
[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.)
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Journal Article
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Birac, A.M.; Saglio, R.; Frappier, J.C.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1983
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1983
AbstractAbstract
[en] Three methods are described; these three methods, using the advantages of focussed probes allow, used simultaneously according to the nature of the detected defects, to evaluate with a good accuracy the dimensions and the orientation of the real or artificial defects
[fr]
Les trois methodes decrites dans cet article, utilisant les avantages des traducteurs focalises permettent, appliquees simultanement suivant la nature des defauts detectes, d'evaluer avec une bonne precision les dimensions et l'orientation de defauts, aussi bien reels qu'artificielsOriginal Title
Amelioration des methodes de dimensionnement par ultrasons focalises
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May 1983; 17 p; Specialist meeting on defect and sizing; Ispra (Italy); 3-6 May 1983
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Report
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Saglio, Robert; Birac, A.M.; Frappier, J.C.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
AbstractAbstract
[en] The CEA (Commissariat a l'Energie Atomique) has developed a system for the acquisition and analysis of data recorded during ultrasonic testing. Initially this system was designed and built for the needs of in-service inspection of PWR type power reactors. It is in far wider use today for miscellaneous automatic ultrasonic inspection procedures. This system records, in digital form, the ultrasonic data supplied by the transducers (maximum 16 simultaneous channels), and the geometric coordinates defining the position of the inspection tool. Based on these data, which are recorded on floppy disk, this system helps to display data in the form of A SCAN, B SCAN and C SCAN images. In addition, processing programs of data transfer from the STADUS floppy disks have been developed and inserted on computers more powerful than the one used in the STADUS system. These programs serve to obtain different fault charts on an adjustable scale, as well as listings concerning the defect positions and dimensions
[fr]
Un systeme d'acquisition et d'analyse des donnees enregistrees lors des controles ultrasonores a ete developpe par le C.E.A. (Commissariat a l'Energie Atomique). Initialement, ce systeme a ete concu et realise pour les besoins des inspections en service des reacteurs electronucleaires du type PWR. Aujourd'hui, il est utilise de facon beaucoup plus generale lors des divers controles automatiques par ultrasons. Ce systeme enregistre, sous forme digitale, les informations ultrasonores fournies par les transducteurs (au maximum 16 voies simultanees), ainsi que les coordonnees geometriques qui definissent la position de l'outil de controle. A partir de ces acquisitions, qui sont enregistrees sur disques souples, ce systeme permet de visualiser les informations sous forme d'images de type A SCAN, B SCAN et C SCAN. En outre, ont ete realisees et implantes, sur des ordinateurs plus puissants que celui equipant le systeme STADUS des programmes de traitement des informations transferees depuis les disques souples du STADUS. Ces programmes permettent d'obtenir - a une echelle ajustable - differentes cartographies des defauts ainsi que des listings relatifs a leur position et a leurs dimensionsOriginal Title
STADUS - Systeme de traitement et d'acquisition des donnees ultrasonores
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May 1982; 19 p; 5. International conference on nondestructive evaluation in the nuclear industry; San Diego, CA (USA); 10 - 13 May 1982
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Vaubert, Y.; Birac, A.M.; Saglio, R.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
AbstractAbstract
[en] An original system of acquisition and analysis of ultrasonic data collected during examinations named STADUS-PRODUS has been developed by C.E.A. in Saclay. First developed for the needs of in-service inspection of PWR vessels, it is now used for the different automatic ultrasonic controls with various tools
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Aug 1982; 20 p; 10. World conference on nondestructive testing; Moscow (USSR); 22 - 28 Aug 1982
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Birac, A.M.; Frappier, J.C.; Serre, M.; Saglio, R.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1983
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1983
AbstractAbstract
[en] The purpose of this paper is to outline some of the simplified approaches for selecting focussed transducers adapted to a specific application. In the case of subcladding cracks encountered in pressure vessel of P.W.R., the size of the defects was of the same order of magnitude as the wave length of the ultrasound. Conventional sizing methods and transducers were inadequate. Focussed transducers associated with conventional sizing method were not sufficient to satisfy the requirement. The use of tip diffraction with well focussed transducers was selected and tested successfully. 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. This study was made under contract from Electricite de France
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Dec 1983; 6 p; 6. International conference on non-destructive evaluation in the nuclear industry; Zurich (Switzerland); 27 Nov - 2 Dec 1983
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Saglio, R.; Birac, A.M.; Frappier, J.C.; Viard, J.; Verger, B.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
AbstractAbstract
[en] For many years the CEA and Intercontrole, a subsidiary, have been using an in-service inspection machine (MIS) equipped with focused transducers for in-service inspection of PWR pressure vessels. At the end of 1979, subcladding defects were discovered inside inlet and outlet nozzles on French pressure vessels. French regulations required the inspection of all the nuclear plant reactor nozzles. A device called MIT (Nozzle inspection machine) was developed for detection and characterization of this type of defect. This paper describes the NDT method and the corresponding equipment
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Oct 1982; 18 p; Conference on periodic inspection of pressurised components; London (UK); 12 - 14 Oct 1982
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AbstractAbstract
[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
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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

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Book
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AbstractAbstract
[en] After a presentation of zones to be controlled the authors indicate the means used (In service inspection tools, non destructive control methods) for in service inspection
[fr]
Apres une presentation des zones a controler les auteurs indiquent les moyens materiels mis en oeuvre (Machine d'Inspection en Service MIS, methodes de controle non destructif) lors des inspectionsOriginal Title
L'inspection en service des cuves de reacteur REP
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Societe Francaise d'Energie Nucleaire (SFEN), 75 - Paris; 123 p; 1988; p. 57-86; Societe Francaise d'Energie Nucleaire; Paris (France); SFEN day on PWR non destructive testing; Paris (France); 24 Nov 1987
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AbstractAbstract
[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)
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Abridged from the report presented at Warrington on 7-8 Oct 1982.
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Journal Article
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British Journal of Non-Destructive Testing; ISSN 0007-1137;
; v. 25(5); p. 258-262

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Vadder, D. de; Saglio, R.; Birac, A.M.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1982
AbstractAbstract
[en] Characterization of ultrasonic beams by means of echos coming back from targets is very often used. Results are not independent of shape and size of those targets. Measuring echos from inclined disk-like targets let appear fluctuating results in the very front part of beams
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Aug 1982; 7 p; 10. World conference on nondestructive testing; Moscow (USSR); 22 - 28 Aug 1982
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