Adaptation of vibrating tables for the dynamic qualification of nuclear equipment

For the dynamic qualification of equipment related with the nuclear safety function, through tests, is required a controlled excitation devices, which be able to reproduce synthetic seisms that to emulate those presented in the site already filtered through building that lodges the specimens to qualificate. Depending on the equipment to qualificate, to exist specific standards or generic that must be execute, which normally requires as minimum in the majority of the cases, a simultaneous biaxial vibration with unjointed movements. At the present, in Mexico not exists a table of this type, however some laboratories have pistons disposed in the vertical position and a table with horizontal excitation direction. These installations are available in the specific cases in which the equipment characteristics to qualificate allows to demonstrate its capacity for developing its function during a postulate critical event, being first vibrated on direction and the other side perpendicularly later, in unjointed form, or else biaxial simultaneous but with coupled movements. For these cases has been elaborated two designs of installation adaptations, the first in the National Laboratory of Industrial Fomentation and the second in the Quality Control Laboratories of the Collective Transport System (METRO) of which is presented its design criterion and basis. (Author)