Transcript Safety at work - Sharif

sharif university of technology
industrial engineering
Safety at work
(Accident Investigation)
Razieh shoeleh
Roya mohamad ali poor
fall2006
What is Ergonomics?
What is an Accident?
A sequence of logically and chronologically
related deviating events involving an
incident that results in injury to personnel or
damage to the environment or material
assets.
Accident
Investigation
• The purpose of accident
investigation
• Identify and describe the true course of
events (what, where,when)
• Identify the direct and root causes /
contributing factors of the accident (why)
• Identify risk reducing measures to prevent
future, comparable accidents (learning)
• Investigate and evaluate the basis for
potential criminal prosecution (blame)
• Evaluate the question of guilt in order to
assess the liability for compensation (pay)
The accident investigation
process
Three phases in accident
investigation
Collecting evidence and facts
• Human or testamentary evidence
Human or testamentary evidence includes witness
statements and observations.
•
Physical evidence
Physical evidence is matter related to the accident (e.g.
equipment, parts, debris, hardware, and other physical
items).
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Documentary evidence
Documentary evidence includes paper and electronic
information, such as records, reports, procedures, and
documentation.
Analysis of evidence and
facts
• What happened where and when?
• Why did it happen?
types of causal factors:
Direct cause
Contributing causes
Root causes
Recommendations and
reporting
• Hendrick and Benner (1987) says that two
thoughts should be kept in mind regarding
accident reports:
• Investigations are remembered trough
their reports
• The best investigation will be wasted by
a poor report.
Methods for accident
investigation
• TRIPOD
• Barrier analysis
• Change analysis.
• Events and causal factors analysis
OTHER ACCIDENT
INVESTIGATION METHODS
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Fault tree analysis
Root cause analysis
Events and causal factors charting (ECFC)
Event tree analysis
MORT
Systematic Cause Analysis Technique (SCAT)
(Sequential timed events plotting)
MTO-analysis
Accident Analysis and Barrier Function (AEB) Method
Acci-map
TRIPOD _BETA
Definition
Advantages
Phases:
• Diagram Tripod_beta
• Hazard conduct
• accident causation model
Diagram Tripod_beta
Elements
• Event
• Hazard
• Target
Hazard conduct
TRIPOD Beta accident
causation model
Example on a TRIPOD
Beta analysis
Thanks for
your attention