Common Cause Failure Analysis
IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making
Common Cause Failure Analysis
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Workshop Information IAEA Workshop XXXX-C-CXiXtiXytXy,,MCMCooooununntnhtthrt,ry,YyYeeaarr
Dependent Failures
Independent Events
A
B
P (A & B) = P (A) ? P (B)
Dependent Events
AB
P (A & B) > P (A) ? P (B) P (A & B) = P (A) ? P (B/A)
IAEA Training Course on Safety Assessment
2
Types of Dependent Events Based on Their Impact on a PSA Model
IAEA Training Course on Safety Assessment
3
Physical Elements of a Dependent Event
COMPONENT A
ROOT CAUSE
COUPLING MECHANISM
COMPONENT B
COMPONENT C
IAEA Training Course on Safety Assessment
4
Dependent Failures
ROOT CAUSE
? Hardware ? Human ? Environmental ? External to the Plant
COUPLING MECHANISM
? Functional Coupling
? Spatial Couplings
? Connected equipment ? Nonconnected equipment
? Spatial proximity ? Linked equipment
? Human Couplings
IAEA Training Course on Safety Assessment
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