WorksheetsQRA1
Total questions: 12
Worksheet time: 4mins
In which phase is a Preliminary QRA conducted to compare design options?
Detailed Engineering Phase
Basic Engineering / FEED Phase
Evaluation / Concept Selection Phase
Operation Phase
Which tool is commonly used in QRAs for modeling sequential event scenarios?
Fault Tree Analysis (FTA)
HAZID
Process Flow Diagram (PFD)
Event Tree Analysis (ETA)
What is the purpose of an Assumption Register in QRA studies?
To document conservative assumptions used during the study
To replace missing data with generic inputs
To define safety barriers for facility operations
To summarize the key findings of risk analysis
Which atmospheric condition is classified as "very unstable" in the Pasquil Stability Classes?
Class C
Class F
Class A
Class F
Which of the following is NOT typically part of a QRA consequence analysis?
Ignition probability modeling
Jet fire heat radiation analysis
Societal risk assessment
Financial loss estimation
What is the main function of the Scope of Work (SOW) in a QRA study?
To estimate event frequencies
To define the objective, boundaries, and deliverables of the study
To validate the assumptions register
To conduct vulnerability analysis
What is the primary purpose of an Event Tree Analysis (ETA) in QRA?
To evaluate potential event sequences after an initiating event
To identify all possible ignition sources in a facility
To model failure frequencies of equipment
To document all assumptions made during the QRA
What does a "fireball" typically result from in a QRA context?
Continuous gas release with no ignition
Leak from non-flammable liquid storage
Delayed ignition of a flammable cloud
Immediate ignition of a large vapor release
Which of the following is a common outcome of delayed ignition of a flammable vapor cloud?
Vapor Cloud Explosion (VCE)
Pool fire
Fireball
Boiling Liquid Expanding Vapor Explosion (BLEVE)
What is the primary focus of the Occupied Building Risk Assessment (OBRA)?
Evaluating equipment reliability
Estimating financial losses from incidents
Assessing risk to individuals in occupied buildings
Identifying ignition sources in hazardous areas
What is a key factor influencing explosion overpressure in a QRA?
Atmospheric stability
Degree of congestion and confinement
Population density
Wind speed and direction
What type of fire occurs when a flammable liquid release ignites and spreads across a horizontal surface?
Pool fire
Jet fire
Flash fire
Fireball
