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DOE-STD-1020-2002
preparedness plan - establish the procedures, responsibility and capability
(i.e., materials, transportation, etc.) to evacuate on-site personnel, secure
vulnerable areas, etc.
maintenance plan - program to insure that the emergency operation plan is
up-to-date and operational.
Guidance for the development of the emergency operation plans can be found in
emergency procedures developed for nuclear power plants, dams and local flood warning
systems. The development of the emergency operation plan should be coordinated with the
results of the flood hazard assessment and local agencies responsible for flood forecasting. The
availability of warning time will vary depending on the type of flood hazard and local
forecasting capabilities. Specific information on flood emergency procedures can be found in
Reference 4-18.
4.4
Considerations for Existing Construction
Existing SSCs may not be situated above the DBFL as defined by these criteria. In this
case, an SSC should be reviewed to determine the level of flooding, if any, that can be sustained,
without exceeding the performance goal requirements. This is referred to as the Critical Flood
Elevation (CFE). If the CFE is higher than the DBFL, then the performance goals are satisfied.
This situation may not be unique for existing construction. For new construction, it may not be
possible to situate all facilities above the DBFL, in which case other design strategies must be
considered. For example, it may be possible to wet proof an SSC, thus allowing some level of
flooding to occur.
For each SSC, there is a critical elevation, which if exceeded, causes damage or
disruption such that the performance goal is not satisfied. The CFE may be located:
below grade due to the structural vulnerability of exterior walls or
instability due to uplift pressures,
at the elevation of utilities that support SSCs, or
at the actual base elevation of an SSC.
Typically, the first floor-elevation or a below-grade elevation (i.e., foundation level) is
assumed to be the critical elevation. However, based on a review of an SSC, it may be
determined that greater flood depths must occur to cause damage (e.g., critical equipment or
materials may be located above the first floor). If the CFE for an SSC exceeds the DBFL, then
the performance goal is satisfied. If the CFE does not exceed the DBFL, options must be
considered to harden the SSC, change the Performance Category, etc.
For Performance Categories 3 and 4, the performance goals require that little or no
interruption of the facility operations should occur. This is an important consideration, since the
assessment of the CFE must consider the impact of the flood on operations (i.e, uninterrupted
access) as well as the damage to the physical systems.
4-14


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