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Safety Basis Analysis - doe-std-1128-98_ch10298
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Building Layout - doe-std-1128-98_ch10300


DOE-STD-1128-98
C.3.2
Lightning Protection
Lightning protection should be provided for all facilities. Lightning protection
systems should be designed in accordance with the most current National Fire
Protection Association (NFPA) code covering lightning protection.
C.3.3
Seismic Design Requirements
The basic seismic parameters should be derived from DOE site-specific hazard
model studies summarized in DOE-STD-1020-2002 (DOE, 2002b). If site-specific
hazard model studies are not available, a hazard model should be developed that is
consistent with the approach used in DOE-STD-1020-2002 (DOE, 2002b). Specific
guidance on relating frequency of occurrence to facility hazard levels may be
obtained from UCRL-15910 (LLNL, 1989).
C.3.4
Other Natural Phenomena
Design loads and considerations for other natural phenomena should provide a
conservative margin of safety that is greater than the maximum historical levels
recorded for the site. Protection against flooding should be based on no less than
the probable maximum flood (PMFL) for the area as defined by the Corps of
Engineers. The possibility of seismically induced damage or failure of upstream
dams should be taken into account in assessing the nature of the flood protection
that is required for the facility. If the facility is in a location that may be subject to
ashfall from volcanic action, consideration should be given to the effects of ashfall
on ventilation and electrical systems.
C.3.5
Explosion, Internal Pressurization, Criticality, and Other Causes of Design-
Basis Accidents
Analyses should be made to determine the probable consequences of design-basis
accidents (DBAs), and critical areas and critical items should be designed to
withstand DBAs. The portion of the ventilation system that is an integral part of the
critical areas should be designed to withstand DBAs so that it will remain intact
and continue to act as a confinement system. Building ventilation is an important
part of confinement barriers and, in some cases, air flow may become the only
barrier.
C-8


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