VIBRATIONS OF FUEL-ELEMENT BUNDLES IN VVER FUEL ASSEMBLIES EXCITED BY TURBULENT COOLANT FLOW

摘要

Complex experimental studies of hydrodynamically excited vibrations of fuel-element bundles have been performed on full-scale models of VVER-440 fuel assemblies. Pressure pulsations were used as the main hydwdynamic characteristic of turbulent coolant flow according to the effect of its load on the fuel-element surfaces in the flow. Realizations of the random hydwdynamic loads causing vibrations of fuel elements are obtained on the basis of multi-point measurements of pressure pulsations along the perimeter of the outer row of the fuels elements in a bundle.