Structural Engineering and Mechanics

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Seismic qualification using the updated finite element model of structures

  • Sinha, Jyoti K. (Vibration Laboratory, Reactor Engineering Division, Bhabha Atomic Research Centre) ;
  • Rao, A. Rama (Vibration Laboratory, Reactor Engineering Division, Bhabha Atomic Research Centre) ;
  • Sinha, R.K. (Reactor Design and Development Group, Bhabha Atomic Research Centre)
  • Received : 2004.03.12
  • Accepted : 2004.07.14
  • Published : 2005.01.10
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Abstract

The standard practice is to seismically qualify the safety related equipment and structural components used in the nuclear power plants. Among several qualification approaches the qualification by the analysis using finite element (FE) method is the most common approach used in practice. However the predictions by the FE model for a structure is known to show significant deviations from the dynamic behaviour of 'as installed' structure in many cases. Considering such limitation, few researchers have advocated re-qualification of such structures after installation at site to enhance the confidence in qualification vis-$\grave{a}$-vis plant safety. For such an exercise the validation of FE model with experimental modal data is important. A validated FE model can be obtained by the Model Updating methods in conjugation with the in-situ experimental modal data. Such a model can then be used for qualification. Seismic analysis using the updated FE model and its advantage has been presented through an example of an in-core component - a perforated horizontal tube of a nuclear reactor.

Keywords

References

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  1. Vibration-based diagnosis techniques used in nuclear power plants: An overview of experiences vol.238, pp.9, 2008, https://doi.org/10.1016/j.nucengdes.2008.03.007