Graded Approach, Performance Goals, and Performance Categories

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