QRA1

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