Nonlinear seismic analysis of a large sodium pump
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.
- Research Organization:
- Hanford Engineering Development Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76FF02170
- OSTI ID:
- 5570603
- Report Number(s):
- HEDL-SA-3261-FP; CONF-850670-20; ON: DE85014001
- 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
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Related Subjects
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