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

Table 8

Major CCF events in the multi-unit LOOP followed by SBO event.

No.	Event	Description	FV	#MCS
1	EPDGW-DGAB	DGs A and B fail to start and load due to CCF	0.022490	3
2	2-EPDGW-DGCD	DGs C and D fail to start and load due to CCF	0.022490	3
3	EPDGW-CCF-DG-A-AAC	Loss of power from DG A and AACDG due to inter-unit CCF	0.000132	1
4	EPDGW-CCF-DG-B-AAC	Loss of power from DG B and AACDG due to inter-unit CCF	0.000132	1
5	EPDGW-CCF-DG-AB-AAC	All DGs fail to start due to inter-unit CCF	0.000132	1
6	2-EPDGW-CCF-DG-C-AAC	Loss of power from DG C and AACDG due to inter-unit CCF	0.000132	1
7	2-EPDGW-CCF-DG-D-AAC	Loss of power from DG D and AACDG due to inter-unit CCF	0.000132	1
8	2-EPDGW-CCF-DG-CD-AAC	Loss of power from DG C and AACDG due to inter-unit CCF	0.000132	1
9	AFW-CCF-LK-STMBD	UNDETECT LKAGETHRU CHK VLV CV27, CF58, or CV89	0.000001	7
10	2-AFW-CCF-LK-STMBD	UNDETECT LKAGETHRU CHK VLV CV27, CF58, or CV89	0.000001	7