Experimental studies of the dynamical characteristics of fuel-element bundles of VVER fuel assemblies in turbulent coolant flow

Studies of fuel-assembly vibrations pay special attention to pre-reactor bench tests with partial modeling of the reactor operating conditions [1]. Full-scale models of fuel assemblies make it possible to reproduce the most important design features affecting the vibration processes under reactor co...

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Bibliographic Details
Published in:Atomic energy (New York, N.Y.) N.Y.), 2013-02, Vol.113 (4), p.295-299
Main Authors: Dragunov, Yu. G., Solonin, V. I., Perevezentsev, V. V., Petrov, I. V.
Format: Article
Language:English
Subjects:
Accelerometers
Analysis
Cooling
Experiments
Flow rates
Flow velocity
Fluid mechanics
Hadrons
Heavy Ions
Nuclear Chemistry
Nuclear Energy
Nuclear fuels
Nuclear Physics
Nuclear reactors
Physics
Physics and Astronomy
Reactors
Reynolds number
Scale models
Studies
Vibration
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Summary:Studies of fuel-assembly vibrations pay special attention to pre-reactor bench tests with partial modeling of the reactor operating conditions [1]. Full-scale models of fuel assemblies make it possible to reproduce the most important design features affecting the vibration processes under reactor conditions. Normal attachment of a full-scale model in the column of a hydrodynamic bench, wide variation range of the coolant flow rate in a fuel-element bundle and formation of the required flow structure, including with large-scale vortices at the inlet into a fuel-element bundle, all make it possible to obtain the required quantitative data on the vibrational characteristics of fuel assemblies. At present, there are too few data on the dynamic characteristics (natural vibrational frequencies, apparent mass, damping constant) of fuel-element bundles in a longitudinal turbulent coolant flow. The present communication describes the results of experimental studies of the dynamical characteristics of fuel-element bundles in modeling the attachment of the top and bottom nozzles of the VVER-440 fuel assembly under the conditions in a reactor.
ISSN:1063-4258
1573-8205
DOI:10.1007/s10512-013-9634-x