Abstract
It is shown that the high intensity of the vibrations of RBMK fuel assemblies is due to the parametric excitation of oscillations when an axial flow of the coolant interacts with the fuel elements. The periodicity of this coolant action is due to plug-flow regimes of the two-phase coolant, pumped-induced oscillations of the coolant flow rate, and turbulization of the flow by the spacing lattices and fittings. It is shown that an in-reactor experiment must be performed in order to obtain a relation between the steam-content distribution and the vibrations in the RBMK fuel assemblies. For this, it is suggested that the steam-content distribution and the vibrations of the fuel elements be measured by using a standard system of measurements of the thermohydraulic and neutron-physical parameters of RBMK reactors and by analysing the noise in the indications of the sensors monitoring the height distribution of the energy release.
Similar content being viewed by others
REFERENCES
J. Reavis, “Vibration correlation for maximum fuel element displacement in parallel turbulent flow,” Nucl.Sci.Eng., 38, No. 1, 63-69 (1969).
D. Gorman, “An analytical and experimental investigation of vibration of cylindrical reactor duel elements in two-phase parallel flow,” Nucl.Sci.Eng., 44, No. 3, 277-290 (1971).
Y. Chen and M. Weber, “Flow-induced vibrations in tube bundle heat exchangers,” ASME (1970), p. 57.
E. D. Fedorovoch, B. S. Fokin, A. F. Axelrod, et al., Vibrations of Equipment Components in Nuclear Power Systems, Énergoatomizdat, Moscow (1989).
A. A. Samarin, Pipe Vibrations and Methods for Eliminating Them in Power Systems, Énergiya, Moscow (1977).
A. I. Dostov and L. D. Ivanov, “Coolant flow fluctuations and control of power of the chernobyl reactor before the accident,” in: ICONE-8 (2000), pp. 273-278.
W. Thompson, Vibration Theory and Applications, Prentice-Hall, Inc., Englewood (1965).
V. V. Bolotin and V. G. Moskvin, “On parametric resonances in stochastic systems,” Izv.Akad.Nauk SSSR, Mekh.Tverd.Tela, No. 4, 88-94 (1972).
T. Hibiki and M. Ishii, “Effect of flow-induced vibration on local flow parameters of two-phase flow,” Nucl.Eng.Design, 185, 113-125 (1998).
F. V. Karmanov, “Investigation of the distribution of the true steam content along boiling channels in pre-and transcrisis regimes,” in: Teplofizika-74, Énergoatomizdat, Moscow (1974).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Dostov, A.I. Mechanism of the Excitation of Vibrations in RBMK Fuel Assemblies. Atomic Energy 96, 145–151 (2004). https://doi.org/10.1023/B:ATEN.0000030914.99682.3f
Issue Date:
DOI: https://doi.org/10.1023/B:ATEN.0000030914.99682.3f