Authors & Affiliations
Perevezentsev V.V., Solonin V.I.
Bauman Moscow State Technical University, Moscow, Russia
Perevezentsev V.V. – Professor, Dr. Sci. (Techn.), Associate Professor.
Vibration processes in nuclear reactors largely determine the reliability of the equipment and the safety of operation of the power unit as a whole. The dynamic effect of the coolant flow on the structural elements of reactor systems initiates and maintains their mechanical vibrations (vibrations). One of the most important mechanical systems that determine the trouble-free operation of WWER reactor plants is the fuel station. Experimental studies are carried out and the results of the characteristics of hydrodynamically excited vibrations of the beam of fuel rods TVS WWER-440 are presented. Experimental data were obtained at the hydrodynamic stand “E7-ELEMASH” using a full-scale (with lead simulators of fuel pellets) model of the WWER-440 TVS of the second generation In order to significantly change the structure of the flow, throttle washers with diameters of 45; 48,5 and 52 mm were placed at the entrance to the fuel assembly model, which are installed in the WWER-440. The results confirmed the determining role in the excitation of fuel rod vibrations not only of the longitudinal velocity, but also of the intensity and spectral composition of the turbulence of the coolant flow. The greatest hydrodynamic loads are formed within the first span between the supporting and first spacer grids. Accordingly, the intensity of vibrations and the likelihood of damage to the shells of fuel rods here is the greatest.
WWER, fuel assembly, fuel rods, hydrodynamics, vibration excitation, pressure pulsations, coolant supply path, throttle washers, vortex structures, pressure pulsation spectra and vibration displacements
1. Solonin V.I., Perevezentsev V.V. Gidrodinamicheski vozbuzhdayemyye vibratsii puchka tvelov pri razlichnykh kharakteristikakh potoka teplonositelya na vkhode v TVS VVER-440 [Hydrodynamically excited vibrations of the beam of fuel rods at various characteristics of the flow of the coolant at the entrance to the WWER-440 fuel assembly]. Izvestiya vuzov. Mashinostroyeniye – BMSTU Journal of Mechanical Engineering, 2006, no. 3, pp. 23–29.
2. Perevezentsev V.V. Vozbuzhdeniye kolebaniy puchka tvelov reaktorov VVER turbulentnym po tokom teplonositelya [Excitation of oscillations of the beam of fuel rods of WWER reactors by turbulent current of the coolant]. Vestnik MGTU im. N.E. Baumana – Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, 2009, no. 4, pp. 78–88.
3. Solonin V.I., Perevezentsev V.V. Vliyaniye gidrodinamicheskikh nagruzok na vibratsii puchkov tvelov teplovydelyayushchikh sborok reaktorov tipa VVER [Hydrodynamic load impact on vibrations of fuel element clusters in water-moderated water-cooled power reactor (WWER) fuel assemblies]. Problemy mashinostroyeniya i nadezhnosti mashin – Problems of Mechanical Engineering and Reliability of Machines, 2009, no. 4, pp. 92–97.
4. Perevezentsev V.V. Osobennosti formirovaniya gidrodinamicheskikh nagruzok na tvely v zavisimosti ot struktury potoka teplonositelya na vkhode v TVS VVER [Features of the formation of hydrodynamic loads on fuel rods depending on the structure of the flow of the coolant at the entrance to the WWER fuel station]. Voprosy atomnoy nauki i tekhniki. Seriya: Yaderno-reaktornyye konstanty – Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2021, no. 3, pp. 136–142.