A case study of the amplification factor for a tested device of Nuclear Power Plant

The equipment response and capacity variables for the fragility computations based on the dynamic testing includes the cabinet-based test and the device-based test. The cabinet-based test data uses the measured response values at the bottom of the cabinet. In contrast to the cabinet-based test, the device-based test are required if the individual electrical components, such as relays are the source of the test data. This study shows the conservatism of the cabinet amplification factor (AFC) presented in EPRI report Methodology for Developing Seismic Fragilities (TR- 103959) in the seismic fragility analysis of the tested device. In general, seismic fragility analysis for a device is performed using the cabinet-based test data. When using the cabinet-based test data, detailed seismic fragility analysis of a particular device cannot be performed because the real response spectra at the device location is unknown. As shown in the case above, using the AFC provided in Table Ⅰ, the seismic fragility analysis results are conservative. Therefore, for device detail analysis, IERS at the location of a device mounted in the cabinet is reproduced to perform the seismic fragility analysis.