Abstract
The aim of this work is to the failure of jet pump analysis using the hydrodynamics and structural analysis coupling in a typical BWR. Different structural problems in jet pups of Boiling Water reactors (BWR) have been reported in the last 20 years. The liquid in the jet pump is accelerated due to high differential pressure in the nozzle that induces vibrations in the slip joint of the diffuser. If the vibrations are out of the range of the natural frequency, they may produce a leakage in the slip joint or a rupture in the riser pipe. A leakage in the area of the slip joint of 5% is simulated to estimate the frequency of vibration of the jet pumps. The results show that as the frequency of the vibration increases the displacement of the jet pump and the stress increases and frequencies higher than 47.5 Hz exceed the modulus of the elasticity limit of the material.
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