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DOE-STD-1020-2002
loadings on the basis of seismic experience data without analysis or testing. Seismic experience
data has been developed in a usable format by ongoing research programs sponsored by the
nuclear power industry. The references for this work are the Senior Seismic Review and
Advisory Panel (SSRAP) report (Reference C-60) and the Generic Implementation Procedure
(GIP) for Seismic Verification of Nuclear Plant Equipment (Reference C-61). Note that there
are numerous restrictions ("caveats") on the use of this data as described in the SSRAP report
and the GIP. It is necessary to conduct either seismic analyses or shake table testing to
demonstrate sufficient seismic capacity for those items that cannot be verified by seismic
experience data or for items that are not obviously inherently rugged for seismic effects. Based
on DOE program on the application of experience data for the evaluation of existing systems and
components at DOE facilities, a document has been prepared specifically tailoring it to DOE
type facilities (Reference C-29).
In early 1982, the Seismic Qualification Utility Group (SQUG) was formed for the
purpose of collecting seismic experience data as a cost effective means of verifying the seismic
adequacy of equipment in existing nuclear power plants. Sources of experience data include: (1)
the numerous non-nuclear power plants and industrial facilities with equipment similar to that in
nuclear plants which have experienced major earthquakes and (2) shake table tests which had
been performed to qualify safety-related equipment for licensing of nuclear plants. This
information was collected and organized and guidelines and criteria for its use were developed.
The GIP is the generic means for applying this experience data to verify the seismic adequacy of
mechanical and electrical equipment which must be used in a nuclear power plant during and
following the occurrence of a design level earthquake.
In order to utilize earthquake experience data to demonstrate seismic adequacy of
equipment, four conditions are required to be met:
1. The seismic motion at the equipment location must be enveloped by the Experience Data
Bounding Spectrum or the Generic Equipment Ruggedness Spectrum (GERS).
2. The equipment must fall within the bounding criteria for a given class of similar
equipment which have survived strong earthquake shaking or past qualification tests.
3. The anchorage of the equipment must be shown to be adequate to survive design level
seismic loads.
4. The equipment must meet the inclusion or exclusion rules, also called caveats, to
determine whether the equipment has important characteristics and features necessary to
be able to verify its seismic adequacy by this approach.
The use of earthquake experience data to verify the seismic adequacy of equipment requires
considerable engineering judgement. As a result, the use of these procedures should be given
special attention in the peer review process.
C-47


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