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Demonstration of Response Spectrum Matching Using the Greedy Wavelet Method

Office of Nuclear Regulatory Research

Seismic ground motion time series are critical for the analysis and design of structures, systems, and components of nuclear power plants, and they are also found in probabilistic risk assessments. They are expected to be widely used in evaluating advanced nuclear reactor designs, many of which involve interactions of innovative systems such as seismic base isolators and water pools that behave in the nonlinear regime during strong earthquakes. The synthetic seismic ground motion time series need to meet the response spectrum matching criteria and ensure the sufficiency of their power spectral density functions.

The Greedy Wavelet Method (GWM, https://doi.org/10.1016/j.nucengdes.2023.112384 ) was developed to address a research need of hundreds of response-spectrally matched time series to estimate the uncertainties in in-structure response spectra due to uncertainties in input time series. The GWM algorithm is fast and stable, and its computational advantages over its predecessors show its high potential for analysis and design situations. This session will provide hands-on demonstration of GWM and show how it can help meet regulatory guidance. Interested RIC2024 participants can run the program with their own examples and are welcome to email their seed time series and design response spectrum to GWM.DE28.RIC2024.Resource@nrc.gov so that short scripts can be prepared to read the data and start the program.


Page Last Reviewed/Updated Monday, January 8, 2024

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