Response of a Nuclear Power Plant Seismically Isolated Using Sliding Bearings Subjected To Severe Ground Shaking


Abstract eng:
Nuclear power plants (NPPs) are required to be designed for earthquakes with long return periods (e.g., 100,000 years). Seismic isolation filters a considerable fraction of earthquake input energy, and is a viable strategy to protect the structural system and internal equipment of NPPs from severe ground shaking. This paper presents key response quantities of an NPP seismically isolated using single concave Friction Pendulum™ (FP) bearings subjected to ground motions consistent with the design basis (10,000-year) and extended design basis (100,000-year) shaking at the Diablo Canyon Nuclear Generating Station in California. Two models were developed to simulate the response of the isolated NPP. The structural system, internal equipment and isolation system were explicitly considered in the first model, while the second model comprised a macro sliding bearing. The coefficient of friction at the sliding surface of the FP bearings was updated during the course of earthquake shaking with instantaneous values of sliding velocity, temperature at the sliding surface and axial pressure on the bearing. Isolation system displacement can be computed using the simplified macro model of the NPP subjected to the two orthogonal horizontal components of ground motions. The temperature dependence of the coefficient of friction at the sliding surface should be considered in the calculation of isolation system displacement; ignoring the heating effects may lead to unconservative estimates. Floor spectral ordinates should be computed using a detailed three-dimensional finite element model of the NPP subjected to the two orthogonal horizontal and vertical components of ground motions. The choice of friction model at the sliding surface does not significantly influence the floor spectral ordinates, especially at a lower elevation.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4072.:
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