Measures Used to Ensure the Dependability of SACs

DOE-STD-1186-2004

MEASURES USED TO ENSURE THE DEPENDABILITY OF SACs

3.1

Lessons Learned on Human Actions Used for Safety Controls in Accident

Scenarios

Human actions, either taken in response to an event or taken proactively to establish desired

conditions, are subject to errors of omission or commission. Experience shows that ACs are

prone to common cause failure. The following attributes have proven value in improving worker

performance in utilizing ACs:

Use of reader/worker/checker systems

Independent verification

Positive feedback systems

Interlocks

Warning signs and barriers

Alarms and monitors

Human factor analysis

Operator training and certification

Continuing training and re-qualification

Abnormal event response drills

Ergonomic considerations in procedures

Dry runs for non-routine operations

Use of double staffing or direct supervision for hazardous operations

Human Reliability Assessment

Each of the above attributes used to improve worker performance in utilizing ACs should be

carefully evaluated for improving the dependability of SACs. Implementation of each these

attributes may not be practical or necessary for every Specific AC. DOE O 5480.19, Conduct of

Operations, and this Standard provide guidance for improving the dependability of SACs based

on the safety function performed by the Specific AC.

3.2

Conduct of Operations

The dependability of all hazard controls, including SACs, is improved by implementing the

facility-appropriate sections of the guidelines for conduct of operations provided in

DOE O 5480.19. Proper conduct of operations is a key safety management program and

should be addressed in the facility DSA as such. The guidelines in DOE O 5480.19 form a