ge6075 professional ethics in engineering unit-4 safety ... · fault tree analysis fault tree...
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GE6075 – Professional Ethics in Engineering
UNIT-4 Safety and Risk
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UNIT-3
Factors Influencing Perception of Risk
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UNIT-3 Factors Influencing Perception of Risk
Probability of Risk
Consequence of Risk –[Phy Damage, loss of Life, Env Degradation etc]
Voluntariness
Magnitude
Proximity
Method of Inf dissemination
Job related[Compulsion or volition]
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Risk Acceptance
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Risk Identification/ Testing for Safety
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Risk analaysis
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Risk Assesment
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FMEA
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FMEA
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FMEA
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FMEA
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FMEA
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Fault Tree Analysis
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Fault Tree Analysis
Fault tree analysis (FTA) is a top down, deductive failure analysis
Uses Boolean logic to combine a series of lower-level events.
Mainly used in the fields of safety & Reliability engineering.
To understand how systems can fail
To identify the best ways to reduce risk .
Used in the aerospace, nuclear power, chemical, pharmaceutical,
petrochemical and other high-hazard industries;
Used in software engineering for debugging purposes and is closely
related to cause-elimination technique used to detect bugs.
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Fault Tree analaysis
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Fault Tree analaysis
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Fault Tree analaysis
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Example-2 (FTA)
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Example-2 (FTA)
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Example-3
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Event-tree Analysis
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Event-tree Analysis
Event tree analysis (ETA) is a forward, bottom up, modeling technique for both
success and failure
Explores responses through a single initiating event
Lays a path for assessing probabilities of the outcomes and overall system analysis.
ETA is a powerful tool that will identify all consequences of a system that have a
probability of occurring after an initiating event
ETA can be applied to a wide range of systems including: nuclear power plants,
spacecraft, and chemical plants.
This Technique may be applied to a system early in the design process to identify
potential issues that may arise rather than correcting the issues after they occur.
With this forward logic process use of ETA as a tool in risk assessment can help to
prevent negative outcomes from occurring
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Example Event tree Analysis
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Example Event tree Analysis
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Event Tree Analysis
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Event Tree Analysis
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Safe Exit
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Risk Benefit Analysis
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Risk Benefit Analysis
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Limitations on Risk Benefit Analysis
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Reducing Risk
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Assessing Personal Risk
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Assessing Public Risk
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Voluntary risk
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Three Miles Island nuclear Power Plant