Noname

Experimental data on flow-inducecl vibrations of a fuel rods beam in fuel assembly WVER-44Q are received on full scale test model. Essential influence of hydrodynamics of a stream before a lower end spacer grid (on an input in a fuel rods beam) on intensity of vibrations is shown. The power model of excitation of vibrations of fuel rods beam, based on regulations about equality in conditions of stationary vibrating processes brought to a fuel rods beam energy of a stream and dissipated is developed at fluctuations of a fuel rods beam of energy because of irreversible losses at bending deformations of walls of fuel rods clothing, by friction in spaser grids and dispersion of energy in a stream of the coolant. On the basis of model the expression for an estimation amplitude a fuel rods beam under the first form of fluctuations with use of the data on root-mean-square values of pulsations of pressure on an input in a fuel rods beam is received.