Authors & Affiliations
Bauman Moscow State Technical University, Moscow, Russia
Developed engineering methods of evaluating vibration intensity fuel rods in WWER fuel assemblies (FA), based on empirical correlations linking pressure pulsationswith vibration intensity (vibrodisplacements). Pressure pulsations in shank FA are proportional to the static pressure losses on the local hydraulic resistances of constructive elements of the coolant inlet tract to lift fuel rods. In particular, when placed at the entrance of the WWER-440 FA throttleorifice pressure pulsations in the shank are proportional to the hydraulic static pressure losses on the throttle orifice <p'in>:?pto. On the basis of experimental data processing of obtained correlation for estimating vibrodisplacements beam rods at an initial hydrodynamic section depending on the intensity of pressure pulsations at the inlet of the beam rods before the lower supporting grid. The results show that the velocity of coolant does not define clearly the intensity of vibration rods. Important are pulsating flow characteristics. To reduce vibration, you must structure the low flow pulsation at the entrance to the FA without resonances in low frequency region.
WWER fuel assemblies, flow induced vibrations, flow structure, pressure pulsations, throttle orifice, debris filters, static pressure losses on input devices
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