Guidance on HF SCTA
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Transcript of Guidance on HF SCTA
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1. Identify main hazards
2. Identify critical tasks
3. Understand the tasks
4. Represent critical tasks
5. Identify human failures and performance influencing
factors (PIFs)
6. Determine safety measures to control human failures
7. Review effectiveness of process
Main inputs Main outputs
Existing safety reports and risk assessmentsSite layouts and descriptions
Existing safety reports and risk assessmentsProcedure manuals, discussions with staff
Written procedures, checklists, job aidsInterviews, interactive observation
Outputs from step 3Methods such as HTA
Task representation from step 4Methods such as human HAZOP
Outputs from step 5Hierarchy of potential risk controls
Trials of SCTAExperience from mature use of SCTA
List of MAHsMajor hazard operations and areas of site
List of safety critical tasksPrioritisation of such tasks when many MAHs
Full understanding of safety critical tasksWho does what, when, in what sequence, etc.
Breakdown of tasks in tables or diagramsSufficient detail for analysis in steps 5 and 6
List of potential human failures & consequencesPIFs and current safety measures
List of potential additional safety measuresALARP demonstration and documentation
Recommendations for improved SCTA qualityRecommendations for improved resource use
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Safety
Culture
Interactive observation
Safety
CultureCTA data collection
Safety
Culture
Interactive observation
Safety
CultureCTA data collection
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LAH
LSH
LI
To Process
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No
Yes
ConsequenceFire Automatic Manual Fire fighting
Fire detected shutdown shutdown successful Escalation preventedYes Yes Yes
Limited escalation
NoEscalation prevented
No Yes YesLimited escalation
NoEscalation prevented
No Yes
Major escalationNo
Major escalationNo
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MAH e.g. loss of
containment
Firefighting
Shutdown
Detection
HF failureHF barrier or recovery measureTechnical barrier or recovery measure
Potential causes Potential consequences
Enhanced smoke/ flame detection
Updated procedure for manual ESD
Maintenancefailures
Start up operationsfailure
Improved PTW system
Labelling of controls
Equipment isolation
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1. Identify main hazards
2. Identify critical tasks
3. Understand the tasks
4. Represent critical tasks
5. Identify human failures and PIFs
6. Determine safety measures to control human failures
7. Review effectiveness of process
Populartechniques
HAZOPsFTA ETA
Walk throughTalk through
HTA
Human HAZOPBow tie
Human HAZOPBow tie
Safety report/ Safety caseIntegration