A Test Verified Model Development Study for a Nuclear Water Chiller Using the Seismic Qualification Analysis and Test

Sur, Ukhwan

doi:10.5516/net.2011.43.4.355

Cited by 4 publications

(1 citation statement)

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“…The test results are assumed to be correct and the finite element model is tuned to closely correlate with the experimental test results. In situ modal test data obtained from the modal tests conducted on the as-installed structure were used directly for the seismic response estimation in order to overcome the limitations when using a finite element model for seismic analysis [ 6 , 7 ]. However, these methods may not always be practical for many of the structural components in a nuclear power plant due to the difficulties of conducting in situ modal tests.…”

Section: Introductionmentioning

confidence: 99%

Structural Safety Analysis Based on Seismic Service Conditions for Butterfly Valves in a Nuclear Power Plant

Han

Ahn

Lee

et al. 2014

The Scientific World Journal

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The structural integrity of valves that are used to control cooling waters in the primary coolant loop that prevents boiling within the reactor in a nuclear power plant must be capable of withstanding earthquakes or other dangerous situations. In this study, numerical analyses using a finite element method, that is, static and dynamic analyses according to the rigid or flexible characteristics of the dynamic properties of a 200A butterfly valve, were performed according to the KEPIC MFA. An experimental vibration test was also carried out in order to verify the results from the modal analysis, in which a validated finite element model was obtained via a model-updating method that considers changes in the in situ experimental data. By using a validated finite element model, the equivalent static load under SSE conditions stipulated by the KEPIC MFA gave a stress of 135 MPa that occurred at the connections of the stem and body. A larger stress of 183 MPa was induced when we used a CQC method with a design response spectrum that uses 2% damping ratio. These values were lower than the allowable strength of the materials used for manufacturing the butterfly valve, and, therefore, its structural safety met the KEPIC MFA requirements.

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Section: Introductionmentioning

confidence: 99%