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- W2468103636 abstract "In the structural design of nuclear power plants, large bore hydraulic snubbers are used in the steam generator (SG) upper support system due to their ability to accommodate the large thermal movement of the SG during plant heatup/cooldown and yet provide restraint to the SG for dynamic loadings such as postulated piping rupture and seismic events. Due to the complexity of the control valve, hydraulic snubbers are very sensitive to abnormalities or changes in the hydraulic fluid. Additionally, snubber service life and operation are directly influenced by the durability of the snubber seal materials. Each of these factors significantly affects the operability of the hydraulic snubber and contributes to the continuing need to monitor and periodically test the performance of the snubbers. In light of the increasing costs to the utilities on the maintenance and testing of these snubbers, analytical methods were developed in order to eliminate all the large bore SG snubbers through the use of non-linear seismic analysis, innovative hardware design and modification, and component reserve design margins. The benefit of this snubber elimination program is to minimize plant operation costs through reductions in plant outage activities and man-rem exposures resulting from eliminated snubber inspection, testing, maintenance andmore » refurbishment. This paper presents a procedure along with analytical techniques used in the non-linear seismic analysis for the snubber-eliminated support configuration. Through this non-linear time-history analysis technique, the analysis resulted in, generally, load reductions in the Reactor Coolant Loop (RCL) system since the original analysis was based on a very conservative response spectra analysis technique. Hence the system components are all qualified.« less" @default.
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- W2468103636 date "1995-12-31" @default.
- W2468103636 modified "2023-09-27" @default.
- W2468103636 title "Non-linear seismic analysis in NSSS system for SG hydraulic snubber elimination" @default.
- W2468103636 hasPublicationYear "1995" @default.
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