NONDESTRUCTIVE TESTING OF MATERIALS AND WELDED JOINTS IN ITER APPLICATIONS
*T. M. Gurieva, **V. T. Pronyakin, **N. K. Rybakov *D. V. Efremov Scientific Research Institute of Electrophysical Apparatus, 189631, St. Petersburg, Russia **Bochvar Research Institute, Moscow, Russia
Keywords: ITER, jacket, diverter, Weldments, NDT
ABSTRACT
Over a period of years the Russian Federation in cooperation with the European Community, USA and Japan have been participating in the development of the International Thermonuclear Experimental Reactor (ITER). Currently the activities are being undertaken on the engineering design and modeling of separate components and systems of the reactor. The integral part of the ITER is the provision of the quality control means and methods for the manufacture and assembly of complicated engineering constructions, first of all, for testing of welded and brazed joints of dissimilar diverter materials, bearing structures of the superconducting magnet system and vacuum vessel. The report presents the results of experiments on the estimation of the efficiency of different NDT methods for the assessment of defect type and size in scale models and elements produced by the technologies intended for the real ITER systems. The results of the experiments on the ultrasonic quality control of diffusion welding and brazing of the Be-MAGT, Cu-MAGT composition on the diverter models are analyzed. The results on testing the adhesion of the diverter welded layers by the ultrasonic echo- method are also presented. The efficiency of the developed NDT system for the quality control of materials and welded joints of the jacket in the jacketing line of the model coil superconductor is demonstrated. The concrete results on the detection and assessment of real defects like cracks, sagging, displacement of Incoloy cylindrical jacket edges during commercial production of the experimental conductor samples are presented. The essential features of the ITER systems necessitate the NDT to be performed with contact-free methods under increased radiation, high and low temperatures, i. e. the development of the automatized NDT of particular components during ITER assembly and operation. The analysis of the overview presented reveals the urgency of the NDT development for ITER.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 2, pages 1001 - 1004 Publisher:Ashgate Publishing Company
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