@article{ref1,
title="Structural safety analysis based on seismic service conditions for butterfly valves in a nuclear power plant",
journal="ScientificWorldJournal",
year="2014",
author="Han, Sang-Uk and Ahn, Dae-Gyun and Lee, Myeong-Gon and Lee, Kwon-Hee and Han, Seung-Ho",
volume="2014",
number="",
pages="e743470-e743470",
abstract="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.<p /> <p>Language: en</p>",
language="en",
issn="2356-6140",
doi="10.1155/2014/743470",
url="http://dx.doi.org/10.1155/2014/743470"
}