Seismic Workplace for Testing Seismic and Vibration Resistance of Equipment

Company VUJE, a.s. within Operational Program Research and Development for the project “Increasing the safety of nuclear equipment during a seismic event“ (ITMS: 26220220171) with support of the Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic for the Structural Funds of EU (Agency), now The Research Agency (RA), built in cooperation with STU in Bratislava common seismic workplace with three one-axis seismic shakers and with modern three-axis seismic shaker, which allows simulating real earthquake loads in all three axis concurrently. On workplace is testing behaviour of equipment during simulation seismic event, or during vibration load when is changing the excitation (change of floor response spectrum during earthquake, change the direction of the excitation) and change of damping (vibration damping during seismic event). Verify seismic resistance machines, equipment and structures, is implemented in according to STN IEC 60980, IEEE344 and STN EN 60255 and mechanical vibration resistance and stability according to STN EN 60068 and STN EN 60255. Tests are part of the components and equipment qualification process (mainly equipment supplied to nuclear power plant), control and management system, machine and electrical parts, or complete assemblies (panels, shelves, distributors and mounting frames with apparatus). Their aim is to demonstrate the ability of the facility to perform its functions before, during a seismic event and, after seismic event if it’s necessary.

Important part of project was also create the virtual models of typical equipment representatives needed for controlled turn-off and cooling of the reactor during a seismic event that was created in SW ANSYS. The results of the calculations were compared with the results of one-axis and three-axis seismic shaker.
Seismic workplace is an important part of testing/accreditation Laboratory qualifications of equipment, where the functionality of the equipment and components are tested, required during normal and accident environmental conditions up to the severity of the accident and verify their functional capability in terms of qualified lifetime. In laboratory are performed accelerated thermal aging test, mechanical and electrical tests, tests of sensing differential calorimetry are detected material constants tested objects (thermic analysis), mechanical properties of polymeric materials (ductility). There are tested samples of equipment, which are supplied to NPP on the place with the risk of an accident connection with loos of coolant from primary (LOCA, HELB), or secondary systems (HELB), alternatively on the place with possibility of over-projection accident (severe accident).


Andrea Horniaková, VUJE a.s.