Analysis of the Leakage-Flow-Induced Vibration of a Slip Joint in a Jet Pump of a Boiling Water Reactor

Cruz-Castro, Juan; Palafox, Edgar Hernández; Sánchez, I.A. Alarcón; Hernández-Gómez, Luis Héctor; Ruiz-López, Pablo; Armenta-Molina, Alejandra

doi:10.4028/www.scientific.net/ddf.390.23

Cited by 4 publications

(2 citation statements)

References 11 publications

(16 reference statements)

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“…e model was made with beam elements and considers the mass of water inside and outside the assembly of the jet pumps. Castro et al [15] evaluated the leakageflow-induced vibration of a slip joint in a jet pump. e natural frequencies were evaluated with different gaps at the slip joint.…”

Section: Natural Frequencies Of the Jet Pump Assembly Submerged In Watermentioning

confidence: 99%

Cross Flow Analysis over the Jet Pumps of a BWR-5 Reactor

Soto-Mendoza

Armenta-Molina

Pérez-Montejo

et al. 2021

Science and Technology of Nuclear Installations

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The recirculation system of a BWR-5 has 20 jet pumps. They are submerged in water in the cylindrical annular zone of the reactor. Their main function is the development of a forcing flow through the nuclear core. It increases the power of the reactor compared with the one obtained by natural circulation. These components have an important safety function in the operation of the reactor. In accordance with document BWRVIP-41 R4, it was concluded that the vibration induced by cross flow over the jet pump assemblies is one of the degradation mechanisms of such pumps. In this paper, the vibration induced by the cross flow at a jet pump assembly BWR-5 was analyzed. A numerical approach was developed. The natural frequencies were obtained, considering the Fluid-Structure Interaction (FSI). The first natural frequency was 25.7 Hz. A Computational Fluid Dynamics (CFD) analysis was carried, in conjunction with the Power Spectral Density (PSD). A frequency of vortex generation of 0.48 Hz was obtained. A vortex generation analysis was carried out with the Q-criteria. The results showed that resonance conditions are unlikely. Therefore, the structural integrity of the jet pump assemblies is maintained.

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Section: Natural Frequencies Of the Jet Pump Assembly Submerged In Watermentioning

confidence: 99%

Cross Flow Analysis over the Jet Pumps of a BWR-5 Reactor

Soto-Mendoza

Armenta-Molina

Pérez-Montejo

et al. 2021

Science and Technology of Nuclear Installations

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“…The latter has been classified as fluidelastic instability. An initial dynamic analysis of the slip joint was carried out in [5].…”

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confidence: 99%

Fluid-Structural Interaction in a Slip Joint of a Jet Pump Assembly of a BWR-5

Cruz-Castro

Grijalba

Hernández-Gómez

et al. 2020

DDF

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Flow-induced vibrations occur in some of the internal components of a nuclear reactor. When specific conditions are present, these vibrations may result in excessive deformations or fatigue that can generate mechanical damage. Several boiling water reactor (BWR) of nuclear power plants (NPP) have experienced failures in the jet pump assembly due to flow-induced vibration (FIV) which could be caused by acoustic pulsations derived from recirculation pumps, vibration induced by turbulence and vibration induced by leakage at the slip joint. The purpose of this paper is to establish a viable numerical methodology to evaluate the fluid-structural interaction at the slip joint of a jet pump. In this analysis, the fluid-structural interaction was evaluated with the finite element method and finite volume method with ANSYS® code in the case of two steel plates with a divergent gap. Results show that a critical velocity could cause fluidelastic instability, if only one flow in a two-way fluid-structural interaction was considered. This is one of the phenomena that could take place at the slip joint of a jet pump assembly.

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Influence of blade number on flow-induced noise of centrifugal pump based on CFD/CA

Wang

Ze-Wen

2020

Vacuum

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Analysis of the Leakage-Flow-Induced Vibration of a Slip Joint in a Jet Pump of a Boiling Water Reactor

Cited by 4 publications

References 11 publications

Cross Flow Analysis over the Jet Pumps of a BWR-5 Reactor

Cross Flow Analysis over the Jet Pumps of a BWR-5 Reactor

Fluid-Structural Interaction in a Slip Joint of a Jet Pump Assembly of a BWR-5

Influence of blade number on flow-induced noise of centrifugal pump based on CFD/CA

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