Analysis of the leakage-flow-induced vibration of a slip joint in a jet pump of a boiling water reactor

J. Cruz Castro, E. Hernández Palafox, I. A. Alarcón Sánchez, L. H. Hernández Gómez, P. Ruiz López, A. Armenta Molina

Research output: Contribution to journalArticleResearchpeer-review

Abstract

© 2019 Trans Tech Publications, Switzerland The purpose of this analysis is to evaluate the structural integrity of the jet pump assembly of a BWR during the performance of its operational and safety functions. The natural frequencies and vibration modes of the jet pump assembly immersed in water were determined. It was observed that the fourth mode shape was torsional, and its associated resonance frequency was 41.82 Hz. Also, the vibration induced by the flow in the leakage of the slip joint was analyzed with an axisymmetric model. The gap of the slip joint was varied from 0.2 mm until 0.65bmm. A gap between 0.6 and 0.64, would cause flow-induced vibration because this excitation frequency matches with the fourth natural frequency of the jet pump assembly. The above was carried out using computational fluid dynamics, as well as the finite element method, with ANSYS Structural and ANSYS Fluent codes.
Original languageAmerican English
Pages (from-to)23-31
Number of pages19
JournalDefect and Diffusion Forum
DOIs
StatePublished - 1 Jan 2019

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jet pumps
boiling water reactors
Jet pumps
Boiling water reactors
slip
leakage
assembly
vibration
Vibrations (mechanical)
resonant frequencies
Natural frequencies
modal response
Structural integrity
computational fluid dynamics
Switzerland
integrity
vibration mode
safety
finite element method
Computational fluid dynamics

Cite this

Cruz Castro, J. ; Hernández Palafox, E. ; Alarcón Sánchez, I. A. ; Hernández Gómez, L. H. ; Ruiz López, P. ; Armenta Molina, A. / Analysis of the leakage-flow-induced vibration of a slip joint in a jet pump of a boiling water reactor. In: Defect and Diffusion Forum. 2019 ; pp. 23-31.
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Analysis of the leakage-flow-induced vibration of a slip joint in a jet pump of a boiling water reactor. / Cruz Castro, J.; Hernández Palafox, E.; Alarcón Sánchez, I. A.; Hernández Gómez, L. H.; Ruiz López, P.; Armenta Molina, A.

In: Defect and Diffusion Forum, 01.01.2019, p. 23-31.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Cruz Castro, J.

AU - Hernández Palafox, E.

AU - Alarcón Sánchez, I. A.

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AB - © 2019 Trans Tech Publications, Switzerland The purpose of this analysis is to evaluate the structural integrity of the jet pump assembly of a BWR during the performance of its operational and safety functions. The natural frequencies and vibration modes of the jet pump assembly immersed in water were determined. It was observed that the fourth mode shape was torsional, and its associated resonance frequency was 41.82 Hz. Also, the vibration induced by the flow in the leakage of the slip joint was analyzed with an axisymmetric model. The gap of the slip joint was varied from 0.2 mm until 0.65bmm. A gap between 0.6 and 0.64, would cause flow-induced vibration because this excitation frequency matches with the fourth natural frequency of the jet pump assembly. The above was carried out using computational fluid dynamics, as well as the finite element method, with ANSYS Structural and ANSYS Fluent codes.

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