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Page Title:
Table 2-1. System Interaction Effects on Performance Categorization |
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|  DOE-STD-1021-93
Table 2-1
System Interaction Effects on Performance Categorization
Performance
Potential for
Revised NPH
Performance
Interaction(3)
Category of
Requirements of
Category of
Target SSC(1)
Source SSC(2)
Source SSC(4)
PC-4
PC-4
PC-3
High
PC-3(5)
Low
PC-2
High
PC-4
PC-2(5)
Low
High
PC-4
PC-1(5)
PC-1
Low
PC-3
PC-2
High
PC-3
PC-2(5)
Low
PC-3
PC-1
High
PC-1(5)
Low
PC-2
PC-1
High
PC-2
PC-1(5)
Low
Notes:
(1) If the target consists of more than one SSC, the highest performance category of the group
shall be considered here.
(2) This is the preliminary performance category of the source SSC before considering system
interaction effects. Note that PC-0 is not considered here because, per Section 2.4(f), a PC-0
SSC cannot have any adverse effect on the performance of PC-1 through PC-4 SSCs.
(3) This is the qualitative assessment of the potential for target SSC failure, given that the
source SSC will fail and interact with the target SSC due to NPH effects.
Thus, if the target is a PC-4 SSC that may be adversely affected by the failure of a PC-2
SSC (source), and if the target failure potential due to this interaction is high, then one of the
2-7
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