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Risk Importance Measures in the Design and Operation of Nuclear Power Plants

By
Ivan Vrbanic
Ivan Vrbanic
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Pranab Samanta
Pranab Samanta
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Ivica Basic
Ivica Basic
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ISBN:
9780791861394
No. of Pages:
152
Publisher:
ASME Press
Publication date:
2017

Up to now we have considered importance measures for a component represented by a FT module (sub-tree) involving a group of basic events (Section 6) or, even, a component represented by multiple different FT modules which appear in mutually exclusive sequences of failures (Section 7). However, none of the underlying basic events was involved in any common cause failure (CCF) group of basic events. (In other words, none of those failures or failure modes was shared by another components.) We will now broaden the discussion to the component-level risk importance measures for the components which are involved in a CCF group (which is, many times, the case with most of components in a PRA model). We start, in this section, with discussing the impact of CCF on risk importance of component which is presented in the FT structure by a single basic event.

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