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

Technical Report · Fri Mar 06 00:00:00 EST 1981

DOI:https://doi.org/10.2172/6402172· OSTI ID:6402172

Smith, P. D.; Dong, R. G.; Bernreuter, D. L.; Bohn, M. P.; Chuang, T. Y.; Cummings, G. E.; Johnson, J. J.; Mensing, R. W.; Wells, J. E.

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 US 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. 66 refs., 29 figs., 10 tabs.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: U.S. Nuclear Regulatory Commission, Washington, DC (United States). Office of Nuclear Regulatory Research
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6402172
• Report Number(s): NUREG/CR-2015-Vol.1; UCRL-53021-Vol.1; INIS-XA-N--186
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
NUCLEAR POWER PLANTS
SEISMIC EFFECTS
RISK ASSESSMENT
COMPUTER CODES
COMPUTERIZED SIMULATION
REACTOR ACCIDENTS
REACTOR SAFETY
RELIABILITY
SITE SELECTION
SYSTEM FAILURE ANALYSIS
ACCIDENTS
NUCLEAR FACILITIES
POWER PLANTS
SAFETY
SIMULATION
SYSTEMS ANALYSIS
THERMAL POWER PLANTS
220900* - Nuclear Reactor Technology- Reactor Safety
220501 - Nuclear Reactor Technology- Environmental Aspects- Siting
210000 - Nuclear Power Plants