Seismic safety margins research program. Project I SONGS 1 AFWS Project

Chuang, Tien-Yow; Smith, Pete; Dong, Rong; Bernreuter, D.L.; Bohn, M.P.; Cummings, G.E.; Wells, J.E.

doi:10.2172/6621589

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“…Our analysis of the SONGS system, to be carried out as part of our Phase II, will be a part of this evaluation. 66 Among the analytic models developed in Phase I, the ground motion and occurrence models that were used to characterize seismic input are already finding practical use in NRC licensing and review programs. These models are being used, for example, in the NRC's Systematic Evaluation Program, whose purpose is the reevaluation of older nuclear power plants in light of current criteria.…”

Section: Applications To Licensingmentioning

confidence: 99%

Seismic Safety Margins Research Program. Phase I, final report - overview

Smith¹,

Dong²,

Bernreuter³

et al. 1981

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The Seismic Safety Margins Research Program (SSMRP) is a multiyear, multiphase program whose overall objective is to develop improved methods for seismic safety assessments of nuclear power plants, using a probabilistic computational procedure. The % program is being carried out at the Lawrence Livermore National Laboratory and is sponsored by the U.S. Nuclear Regulatory Commission, Office of Nuclear Regulatory Research. Phase I of the SSMRP was successfully completed in January 1981: A * probabilistic computational procedure for the seismic risk assessment of nuclear power plants has been developed and demonstrated. The methodology is implemented by three computer programs: HAZARD, which assesses the seismic hazard at a given site, SMACS, which computes in-structure and subsystem seismic responses, and SEISIM, which calculates system failure probabilities and radioactive release probabilities, given (1) the response results of SMACS, (2) a set of event trees, (3) a family of fault trees, (4) a set of structural and component fragility descriptions, and ( 5) a curve describing the local seismic hazard. The practicality of this methodology was demonstrated by computing preliminary release probabilities for Unit 1 of the Zion Nuclear Power Plant north of Chicago, Illinois.Studies have begun aimed at quantifying the sources of uncertainty in these computations. Numerous side studies were undertaken to examine modeling alternatives, sources of error, and available analysis techniques. Extensive sets of data were amassed and evaluated as part of projects to establish seismic input parameters and to produce the fragility curves.

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Section: Applications To Licensingmentioning

confidence: 99%