Failure, modal, and vibration analysis of a reactor pool cooling pump

Hazelwood, Thomas J.; Phillips, Larry D.; Van Hoy, Blake W.

Title: Failure, modal, and vibration analysis of a reactor pool cooling pump

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Abstract

Two 75 HP pumps redundantly supply cooling water to the reactor pool of the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL). Due to a recent history of premature bearing failures, one of these pumps has undergone maintenance to deal with possible issues of misalignment and base looseness. Vibration analysis and modal analysis including steady state spectrum, operational deflection shape, run up and down order tracking, and modal impact have been utilized to verify the effectiveness of the maintenance and identify possible remaining failure modes. The studies conclude that the pump is, after the maintenance, in an overall good conditional state as per ISO 10816, but a few failure modes remain. These modes consist of some shaft unbalance, considerable shaft misalignment intensified by piping movement, possible motor ground fault, hydrodynamic issues such as cavitation with modal interaction, and base looseness. These failure modes and their supporting data have been used to make suggestions for future maintenance, to verify the effectiveness of the previous maintenance, and to provide a base on which to check future data. This report will cover the testing setup, methodology, analysis results, and maintenance suggestions.

Authors:

Hazelwood, Thomas J. ^[1]; Phillips, Larry D. ^[1]; Van Hoy, Blake W. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: 2017-10-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1423011

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: International Journal of COMADEM

Additional Journal Information:: Journal Volume: 20; Journal Issue: 4; Journal ID: ISSN 1363-7681

Publisher:: COMADEM International

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; condition monitoring; diagnostics; failure prevention; fault analysis; signal analysis

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                    Hazelwood, Thomas J., Phillips, Larry D., and Van Hoy, Blake W. Failure, modal, and vibration analysis of a reactor pool cooling pump.  United States: N. p., 2017. 
        Web.

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                    Hazelwood, Thomas J., Phillips, Larry D., & Van Hoy, Blake W. Failure, modal, and vibration analysis of a reactor pool cooling pump.  United States.

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                    Hazelwood, Thomas J., Phillips, Larry D., and Van Hoy, Blake W. Sun .  
        "Failure, modal, and vibration analysis of a reactor pool cooling pump".  United States.  https://www.osti.gov/servlets/purl/1423011.

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@article{osti_1423011,

  title        = {Failure, modal, and vibration analysis of a reactor pool cooling pump},

  author       = {Hazelwood, Thomas J. and Phillips, Larry D. and Van Hoy, Blake W.},

  abstractNote = {Two 75 HP pumps redundantly supply cooling water to the reactor pool of the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL). Due to a recent history of premature bearing failures, one of these pumps has undergone maintenance to deal with possible issues of misalignment and base looseness. Vibration analysis and modal analysis including steady state spectrum, operational deflection shape, run up and down order tracking, and modal impact have been utilized to verify the effectiveness of the maintenance and identify possible remaining failure modes. The studies conclude that the pump is, after the maintenance, in an overall good conditional state as per ISO 10816, but a few failure modes remain. These modes consist of some shaft unbalance, considerable shaft misalignment intensified by piping movement, possible motor ground fault, hydrodynamic issues such as cavitation with modal interaction, and base looseness. These failure modes and their supporting data have been used to make suggestions for future maintenance, to verify the effectiveness of the previous maintenance, and to provide a base on which to check future data. This report will cover the testing setup, methodology, analysis results, and maintenance suggestions.},

  doi          = {},

  journal      = {International Journal of COMADEM},

  number       = 4,

  volume       = 20,

  place        = {United States},

  year         = {2017},

  month        = {10}

}

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