Assessing the Impact of Common Cause Failures on Site Risk within Level 1 Multi-Unit PSA

Table 5

Major CCF events in the multi-unit SBO event scenarios.

No	Event	Description	FV	#MCS
1	AFW-CCF-FS-FW3AB	Common cause failure of AFW motor driven pump	0.008705	8
2	2-AFW-CCF-FS-FW3AB	Common cause failure of AFW motor driven pump	0.008705	8
3	PPS-CCF-FT-15356	CCF of PORV blocking valves	0.008330	6
4	2-PPS-CCF-FT-15356	CCF of PORV blocking valves	0.008330	6
5	2-OEP-CCF-FS-DGAB	DG CCF to start	0.001543	3
6	AFW-CCF-LK-STMBD	Undetected Leakage Thro CV27, CF58, or CV89	0.068165	10
7	2-AFW-CCF-LK-STMBD	Undetected Leakage Thro CV27, CF58, or CV89	0.068165	10