Seismic Safety Margins Research Program findings (SSMRP Phase I work)
Objective is to develop improved requirements for seismic safety assessment of nuclear power plants. Three phases are planned. Phase I, successfully completed in January 1981, was to develop and demonstrate a probabilistic computational procedure for our investigation of the seismic safety assessment process. Phase II will use this procedure to carry out the investigation, and Phase III will develop improved requirements for seismic safety assessment. This paper provides an overview of the SSMRP and the work performed in Phase I, which was organized into eight projects. Project I was to select a typical power plant and to collect necessary dta. The Zion Nuclear Power Plant, Unit 1, north of Chicago, Illinois was selected as the demonstration plant for the computational procedure. Project II developed the tools and models necessary to describe probabilistically the seismic hazard at the Zion Site. A hazard curve was developed and 30 time histories were generated for each of six acceleration ranges spanning from 0.15g to 1.8g. In Project III the models for soil-structure interaction were developed. Models for major structural response were generated in Project IV. Project V developed models for 13 piping systems of the Zion Plant, the ones deemed most important to seismic safety. The development of fragility descriptions for components and structures is carried out in Project VI. Fragility curves are developed for 37 generic categories of compenents and five Zion structures. Project VII is to generate the systems analysis models for the Zion Plant and develop the computer code SEISIM for performing the probbilistic failure analyses. The computer code SMACS is developed in Project VIII to tie together the calculations of soil-structure interaction, major structural response, and subsystem response.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5417438
- Report Number(s):
- UCRL-85706; CONF-810460-1; ON: TI85016721
- Country of Publication:
- United States
- Language:
- English
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