Abstract
After the 2011 Fukushima Daiichi Nuclear Power Station accident, the importance of seismic probabilistic risk assessment has drawn much attention to improving the safety of nuclear facilities against ground motions exceeding the design ground motion. Since the seismic force acts on multiple components simultaneously, evaluating the joint damage probability of multiple components considering the response and resistance correlation for detailed analysis of scenarios under severe ground motion is crucial. However, the building’s conventional simple sway-rocking (SR) lumped mass model cannot sufficiently express the three-dimensional (3D) detailed seismic response characteristic, including the local response and damage. There was no choice but to express the effects of correlations between damage events in a simplified way, such as perfect correlation. Therefore, by utilization the seismic response analysis method using the building’s 3D finite element (FE) analysis model that can express local response and damage and obtaining the building’s detailed floor response related to equipment damage, a more realistic evaluation of the correlation of equipment damage is expected. This paper focuses on the equipment response related to equipment damage in nuclear facilities, compares the correlation coefficients of the maximum acceleration and floor response spectra of the equipment installation position obtained using the building’s conventional SR and 3D FE models, and clarifies the correlation characteristics of equipment response.
