Nonlinear seismic analysis of a large sodium pump

Huang, S N

Title: Nonlinear seismic analysis of a large sodium pump

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Abstract

The bearings and seismic bumpers used in a large sodium pump of a typical breeder reactor plant may need to be characterized by nonlinear springs and gaps. Then, nonlinear seismic analysis utilizing the time-history method is an effective way to predict the pump behaviors during seismic events, especially at those bearing and seismic bumper areas. In this study, synthesized time histories were developed based on specified seismic response spectra. A nonlinear seismic analysis was then conducted and results were compared with those obtained by linear seismic analysis using the response spectrum method. In contrast to some previous nonlinear analysis trends, the bearing impact forces predicted by nonlinear analysis were higher than those obtained by the response spectrum method. This might be due to the larger gaps and stiffer bearing supports used in this specific pump. However, at locations distant from the impact source, the nonlinear seismic analysis has predicted slightly less responses than those obtained by linear seismic analysis. The seismically induced bearing impact forces were used to study the friction induced thermal stresses on the hydrostatic bearing and to predict the coastdown time of the pump. Results and discussions are presented.

Authors:: Huang, S N

Publication Date:: Tue Jan 01 00:00:00 EST 1985

Research Org.:: Hanford Engineering Development Lab., Richland, WA (USA)

OSTI Identifier:: 5570603

Report Number(s):: HEDL-SA-3261-FP; CONF-850670-20
ON: DE85014001

DOE Contract Number:: AC06-76FF02170

Resource Type:: Conference

Resource Relation:: Conference: ASME pressure vessel and piping division conference, New Orleans, LA, USA, 24 Jun 1985; Other Information: Portions of this document are illegible in microfiche products

Country of Publication:: United States

Language:: English

Subject:: 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; LMFBR TYPE REACTORS; PUMPS; SEISMIC EFFECTS; ACCELERATION; EARTHQUAKES; PRIMARY COOLANT CIRCUITS; SODIUM; SPECTRA; ALKALI METALS; BREEDER REACTORS; COOLING SYSTEMS; ELEMENTS; ENERGY SYSTEMS; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; LIQUID METAL COOLED REACTORS; METALS; REACTOR COMPONENTS; REACTOR COOLING SYSTEMS; REACTORS; SEISMIC EVENTS; 210500* - Power Reactors, Breeding

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                    Huang, S N. Nonlinear seismic analysis of a large sodium pump.  United States: N. p., 1985. 
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                    Huang, S N. Nonlinear seismic analysis of a large sodium pump.  United States.

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                    Huang, S N. 1985.  
        "Nonlinear seismic analysis of a large sodium pump".  United States.  https://www.osti.gov/servlets/purl/5570603.

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@article{osti_5570603,

  title        = {Nonlinear seismic analysis of a large sodium pump},

  author       = {Huang, S N},

  abstractNote = {The bearings and seismic bumpers used in a large sodium pump of a typical breeder reactor plant may need to be characterized by nonlinear springs and gaps. Then, nonlinear seismic analysis utilizing the time-history method is an effective way to predict the pump behaviors during seismic events, especially at those bearing and seismic bumper areas. In this study, synthesized time histories were developed based on specified seismic response spectra. A nonlinear seismic analysis was then conducted and results were compared with those obtained by linear seismic analysis using the response spectrum method. In contrast to some previous nonlinear analysis trends, the bearing impact forces predicted by nonlinear analysis were higher than those obtained by the response spectrum method. This might be due to the larger gaps and stiffer bearing supports used in this specific pump. However, at locations distant from the impact source, the nonlinear seismic analysis has predicted slightly less responses than those obtained by linear seismic analysis. The seismically induced bearing impact forces were used to study the friction induced thermal stresses on the hydrostatic bearing and to predict the coastdown time of the pump. Results and discussions are presented.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/5570603},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Jan 01 00:00:00 EST 1985},

  month        = {Tue Jan 01 00:00:00 EST 1985}

}

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