Table B-2 Comparison of Performance Categories from Various Sources

DOE-STD-1020-2002

must be a very small likelihood of damage due to natural phenomena hazards. DOE-STD-1020

NPH criteria for Performance Category 3 and higher SSCs are more conservative than

requirements found in model building codes and are similar to DOD criteria for high risk

buildings and NRC criteria for various applications as illustrated in Table B-2. Table B-2

illustrates how DOE-STD-1020 criteria for the performance categories defined in DOE O 420.1

and the associated Guides compare with NPH criteria from other sources

Table B-2 Comparison of Performance Categories from Various Sources

Source

SSC Categorization

DOE-STD-1020 - DOE Natural

Phenomena Hazard Criteria

Uniform Building

General

Essential

Code

Facilities

DOD Tri-Service Manual

High

for Seismic Design of

Risk

Essential Buildings

NRC

Nuclear Regulatory

Evaluation

Fuel

Commission

of Existing Reactors

Facilities

The design and evaluation criteria presented in this document for SSCs subjected to

natural phenomena hazards have been specified to meet the performance goals presented in

Table B-1. The basis for selecting these performance goals and the associated annual

probabilities of exceedance are described briefly in the remainder of this section.

For Performance Category 1 SSCs, the primary concern is preventing major structural

damage or collapse that would endanger personnel. A performance goal annual probability of

exceedance of about 10-3 of the onset of significant damage is appropriate for this category. This

performance is considered to be consistent with model building codes (Refs. B-7, B-11, B-12,

and B-13, B-19), at least for earthquake and wind considerations. The primary concern of model

building codes is preventing major structural failure and maintaining life safety under major or

severe earthquakes or winds. Repair or replacement of the SSC or the ability of the SSC to

continue to function after the occurrence of the hazard is not considered.

Performance Category 2 SSCs are of greater importance due to mission-dependent

considerations. In addition, failure of these SSCs may pose a greater danger to on-site personnel

than Performance Category 1 SSCs because of operations or materials involved. The

performance goal is to maintain both capacity to function and occupant safety. Performance

Category 2 SSCs should allow relatively minor structural damage in the event of natural

phenomena hazards. This is damage that results in minimal interruption to operations and that

can be easily and readily repaired following the event. A reasonable performance goal is judged

to be an annual probability of exceedance of between 10-3 and 10-4 of structure or equipment

damage, with the SSC being able to function with minimal interruption. This performance goal

B-6