Figure C-2 Performance Goal Achievement

DOE-STD-1020-2002

Earthquake Loading

Intentional Conservatism In:

Defined at Specified

1) Response Evaluation

Annual probability from

2) Permissible Response

Seismic Hazard Curve

3) Ductile Detailing

Figure C-2 Performance Goal Achievement

The performance goals for PC-1 SSCs are consistent with goals of model building codes

for normal facilities; the performance goals for Performance Category 2 SSCs are slightly more

conservative than the goals of model building codes for important or essential facilities. For

seismic design and evaluation, model building codes utilize equivalent static force methods

except for very unusual or irregular facilities, for which a dynamic analysis method is employed.

The performance goals for PC-3 SSC's are consistent with DOE essential facilities and Pu

handling facilities. The performance goals for Performance Category 4 SSC's approach those

used for nuclear power plants. For these reasons, this standard specifies seismic design and

evaluation criteria for PC-1 and PC-2 SSC's corresponding closely to model building codes and

seismic design and evaluation criteria for both PC-3 and PC-4 SSC's based on dynamic analysis

methods consistent with those used for similar nuclear facilities.

By conceptual development, the DBE is defined at specified hazard probability PH and

the SSC is designed or evaluated for this DBE using an adequately conservative deterministic

acceptance criteria. To be adequately conservative, the acceptance criteria must introduce an

additional reduction in the risk of unacceptable performance below the annual risk of exceeding

the DBE. The ratio of the seismic hazard exceedance probability, PH to the performance goal

probability PF is defined herein as the risk reduction ratio RR, given by:

RR =

(C-1)

Current Status

This concept enunciated above has been carried forward after issuance of IBC 2000.

The performance goals achieved with IBC 2000 criteria are better than indicated Appendix B

and for intent of this standard are deemed to meet the target performance goals.

In any case, the performance goals given in Appendix B and C for Performance

Categories 1 and 2 are for historical purposes from the days of the 1994 Uniform Building

C-5