Impact of changes in damping and spectrum peak broadening on the seismic response of piping systems

Technical Report · Thu Dec 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/6925714· OSTI ID:6925714

Chuang, T. Y.; Lu, S. C.; Benda, B. J.; Johnson, J. J.

The seismic response of piping systems in nuclear power plants is commonly separated into two parts - the inertial or dynamic response and the pseudostatic response due to relative motions of the systems supports. Various analysis procedures have been developed to calculate each portion of the response separately. The present study investigates calculational procedures and parameter values used for the calculation of the inertial response component. It also investigates the possibility of removing snubbers and restraints in piping systems. Removal of snubbers and restraints will reduce the seismic stresses due to relative support motions. The scope of the present study was to evaluate the PVRC-proposed changes relative to piping responses calculated by response-spectrum methodology and a multi-support time history analysis procedure which is less conservative because it does not require any form of enveloping of support motions. Numerous response-spectrum analyses of three selected piping systems in Zion nuclear power plant were performed, using different combinations of damping values (RG 1.61 and proposed PVRC), peak-broadening (RG 1.22), and the alternative to peak broadening (proposed PVRC).

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6925714
• Report Number(s): NUREG/CR-3526; UCRL-53491; ON: DE84006514
• Country of Publication: United States
• Language: English

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