Research Article

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

Table 2

Summary of most significant scenarios in the multi-unit LOOP event.

No.ValueEventDescription

10.0001423.93%
1.00E − 02%IE_LOOP1Unit 1 LOOP initiating event
1.40E − 02EPDGS-AACNo power from AACDG by AACDG failure
1.00E + 00#1UNITTag event for core damage in 1 unit
1.00E + 00#LOOP_UNIT_1–5!Unit 1 LOOP sequence 5

20.0001423.93%
1.00E − 02%IE_LOOP1Unit 1 LOOP initiating event
1.40E − 02EPDGS-AACNo power from AACDG by AACDG failure
1.00E + 00#2UNITSTag event for core damage in 2 units
1.00E + 00#LOOP_UNIT_1-5!Unit 1 LOOP sequence 5

30.0001423.93%
1.00E − 02%IE_LOOP2Unit 2 LOOP initiating event
1.40E − 022-EPDGS-AACNo power from AACDG by AACDG failure
1.00E + 00#2UNITSTag event for core damage in 2 units
1.00E + 00#LOOP_UNIT_2–5!Unit 2 LOOP sequence 5

40.0001423.93%
1.00E − 02%IE_LOOP2LOOP initiating event
1.40E − 022-EPDGS-AACNo power from AACDG by AACDG failure
1.00E + 00#1UNITTag event for core damage in 1 unit
1.00E + 00#LOOP_UNIT_2-5!Unit 2 LOOP sequence 5

56.58E − 061.13%
1.00E − 02%IE_LOOP1Unit 1 LOOP initiating event
6.58E − 04EPDGW-DGABDGs A and B fail to start and load due to CCF
1.00E + 00#2UNITSTag event for core damage in 2 units
1.00E + 00#LOOP_UNIT_1-5!Unit 1 LOOP sequence 5

66.58E − 061.13%
1.00E − 02%IE_LOOP1Unit 1 LOOP initiating event
6.58E − 04EPDGW-DGABDGs A and B fail to start and load due to CCF
1.00E + 00#1UNITSTag event for core damage in 1 unit
1.00E + 00#LOOP_UNIT_1–5!LOOP sequence 5

71.96E − 060.34%
1.00E − 02%IE_LOOP1Unit 1 LOOP initiating event
1.40E − 02EPDGS-DGBDG B fails to start and load
1.40E − 02EPDGS-DGADG A fails to start and load
1.00E + 00#1UNITTag event for core damage in 1 unit
1.00E + 00#LOOP_UNIT_1–5!Unit 1 LOOP sequence 5

81.96E − 060.34%
1.00E − 02%IE_LOOP2Unit 2 LOOP initiating event
1.40E − 022-EPDGS-DGCDG D fails to start and load
1.40E − 022-EPDGS-DGDDG A fails to start and load
1.00E + 00#2UNITSTag event for core damage in 2 units

91.96E − 060.34%
1.00E − 02%IE_LOOP2Unit 2 LOOP initiating event
1.40E − 022-EPDGS-DGCDG C fails to start and load
1.40E − 022-EPDGS-DGDDG D fails to start and load
1.00E + 00#1UNITTag event for core damage in 1 unit

101.96E − 060.34%
1.00E − 02%IE_LOOP1Unit 2 LOOP initiating event
1.40E − 02EPDGS-DGBDG B fails to start and load
1.40E − 02EPDGS-DGADG A fails to start and load
1.00E + 00#1UNITTag event for core damage in 1 unit