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Page Title: Appendix B: Interim Guidance For The Development of Deterministric Spectral Shape - Continued
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DOE-STD-1024-92
Standard Review Plan, Section 2.5.2 regarding methods to develop site-
specific spectral shapes. The development of median response spectra
should address the issue of appropriate frequency range for ground
motion in the Eastern United States.
3.
Scale the spectra for each M:R combination to the corresponding
ground motion parameter value associated with the appropriate annual
probability from UCRL-15910 (DOE-STD-1020). For example, scale the
median spectra for M(l):R(l) to the PGA with the appropriate annual
probability (e.g., 2 x 10E-4 for high hazard facilities), and scale the
M(2):R(2) spectra to the MSV with the same annual probability.
Note that the scaling to the MSV may be problematic in that the
appropriate value of the MSV is questionable. The correction
factors of 1.8 and 1.65 are not applicable to the MSV. If this
approach is selected, justification should be provided for the MSV
value selected.
4.
Envelope the two resulting spectra to create a single response
spectrum.
The steps above are thought to represent one approach to developing site-
specific spectra for use with probabilistic peak accelerations. The DOE is
evaluating this approach for technical adequacy. Other approaches may also be
proposed and will be evaluated by DOE for technical adequacy. At present
DOE's Oak Ridge Office, working with Martin Marietta, is attempting to implement
the above interim guidance at Paducah and Portsmouth as test cases.
The engineer/designer may either use the above single envelope spectra or
analyze twice, one for each M:R combination, using the more conservative result
for design purposes.
B-2


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