Seismic Qualification of Main Control Boards by Combined Mathematical Model and In-situ Modal Test

by Mark D. Wiebke, Duke Power Co, Charlotte, NC, USA,
John M. Richards, Duke Power Co, Charlotte, NC, USA,
Giles G. Childress, Duke Power Co, Charlotte, NC, USA,

Document Type: Proceeding Paper

Part of: Structural Engineering in Nuclear Facilities

Abstract: By adjusting the stiffness of the model, mode shapes and frequencies can be matched to those from the in-situ tests, thus giving a verified and representative model. With the verified model, all stresses are determined and response spectra generated for individual electrical component qualification. Any equipment modifications to the actual boards can be easily simulated in the fine-tuned model with the same confidence as the original model without having to rerun the costly in-situ test. This is particularly beneficial due to the potential for numerous modifications and upgrades to the control boards over the projected plant life. To eliminate the need for reanalysis with each modification, a method is presented to develop parametric guidelines based on additional mass, participation factors and mode coefficient ratios.

Subject Headings: Model tests | Field tests | Mathematical models | Electric power | Electrical equipment | Stiffening | Verification

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