Comparison of Methods for Dependency Determination between Human Failure Events within Human Reliability Analysis

Table 1

SPAR-H dependency.

Condition number	Crew (same or different)	Time (close in time or not close in time)	Location (same or different)	Cues (additional or no additional)	Dependency
1	S	C	S	NA	COMPLETE	When considering
2				A	COMPLETE	recovery in a series, for
3			D	NA	HIGH	example, 2nd, 3rd, or
4				A	HIGH	4th checker:
5		NC	S	NA	HIGH	if this error is the
6				A	MODERATE	3rd error in the sequence,
7			D	NA	MODERATE	then the dependency is
8				A	LOW	at least moderate;
9	D	C	S	NA	MODERATE	if this error is the
10				A	MODERATE	4th error in the sequence,
11			D	NA	MODERATE	then the dependency
12				A	MODERATE	is at least high
13		NC	S	NA	LOW
14				A	LOW
15			D	NA	LOW
16				A	LOW
17					ZERO