Most of the equipment used in the industry and particularly in the nuclear activity, need to be vacuum or pressure tight for operative and safety requirements. These devices have to satisfy particular regulations in order to be qualified by means of operating licenses. One of the most efficient systems to ensure leak-tightness is using a helium leak detector with a mass spectrometer. In this paper we show the equipment and the devices employed in fuel bars fabrication for CAREM project, and some typical material defects. Operating system and the sensitive of this method is also described.
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