Sensitivity of Peak Dynamic Responses to Input Factors

by William J. O'Connell, Lawrence Livermore Natl Lab, Livermore, CA, USA,

Document Type: Proceeding Paper

Part of: Structural Engineering in Nuclear Facilities


Responses have been calculated for the Zion Unit 1 plant, using the SSMRP computer code SMACS, as part of the seismic probabilistic risk assessment performed by the Seismic Safety Margins Research Program (SSMRP), supported by the NRC Office of Nuclear Regulatory Research. Linear regression analysis (LRA) is used to develop a simple model of the SMACS calculations. The sensitivities of the responses are the coefficients from the LRA. The LRA provides an approximate but simple overview of the complex response behavior. Heavy equipment such as the pressurizer and the steam generators has a large influence on the response of attached piping. Piping damping is sometimes important to the piping response, but in those cases piping frequency is usually more important. Variability in the inputs introduces correlations among the affected responses. The soil damping, through the local site effect, strongly affects all the plant responses.

Subject Headings: Sensitivity analysis | Dynamic response | Linear analysis | Regression analysis | Damping | Dynamic analysis | Computer software | Standards and codes

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