Lightning Protection - doe-std-1128-98

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