Risk and Reliability Assessment Methods

Question 1

Quantitative risk assessment (QRA) involves 4 basic stages:

Answer 1

• Identification of potential safety hazards
• The estimation of the consequences of each hazard
• The estimation of the probability of occurrence of each hazard
• A comparison of the results of the analysis against the acceptability
  criteria

Question 2

Qualitative risk assessment tools:

Answer 2

Checklists: Used to identify hazards.

HAZOP:
– Hazard and Operability Studies
– Applies a set of guidewords to determine the
consequences of operating outside the design intention

FMEA
– Failure Mode and Effects Analysis
– Step by step procedure for the systematic evaluation of
the severity of potential failure modes in a system.

Question 3

Quantitative Reliability tools:

Answer 3

Efficiency:
Combinatorial Methods
- Reliability Block Diagrams
Fault Trees
-(Event Tree Analysis, Cause
Consequence Analysis)

Complexity:
Simulation