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DOE-STD-1020-2002
considerations including detailing for ductility. Reference B-6 gives structural details for wind
design.
Figure B-1 DOE-STD-1020 Combines Probabilistic and DeterminsticMethods to Achieve
Performance Goals
B.2
Graded Approach, Performance Goals, and Performance
Categories
As stated above, DOE O 420.1 and the associated Guide establishes a graded approach
in which NPH requirements are provided for various performance categories each with a
specified performance goal. The motivation for the graded approach is that it enables design or
evaluation of DOE structures, systems, and components to be performed in a manner consistent
with their importance to safety, importance to mission, and cost. There are only a few "reactor"
facilities in the DOE complex and many facilities with a wide variety of risk potential, mission,
and cost. Also, the graded approach enables cost-benefit studies and establishment of priorities
for existing facilities. There are few new designs planned for the DOE complex and the
evaluation of existing facilities requires cost benefit considerations and prioritizing upgrading
and retrofit efforts. Finally, the graded approach is common practice by model building codes
such as the Uniform Building Code (Ref. B-7), IBC-2000 (Ref. B-19) Department of Defense
B-3


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