Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-Tree/Fault-Tree (ET/FT) Method
Table 7
Importance and sensitivity of the selected components on system risk.
Number
Component
FC
RDF
RIF
Sens
1
1 ACM-1
2.72 × 10−1
1.37
1.12 × 106
4.57
2
1 ACM-2
2.72 × 10−1
1.37
1.12 × 106
4.57
3
1 ACM-3
2.72 × 10−1
1.37
1.12 × 106
4.57
4
2 ACM-1
2.72 × 10−1
1.37
1.12 × 106
4.57
5
2 ACM-2
2.72 × 10−1
1.37
1.12 × 106
4.57
6
2 ACM-3
2.72 × 10−1
1.37
1.12 × 106
4.57
7
3 ACM-1
2.72 × 10−1
1.37
1.12 × 106
4.57
8
3 ACM-2
2.72 × 10−1
1.37
1.12 × 106
4.57
9
3 ACM-3
2.72 × 10−1
1.37
1.12 × 106
4.57
10
4 ACM-1
2.72 × 10−1
1.37
1.12 × 106
4.57
11
4 ACM-2
2.72 × 10−1
1.37
1.12 × 106
4.57
12
4 ACM-3
2.72 × 10−1
1.37
1.12 × 106
4.57
13
11 CPU-A
3.27 × 10−7
1.00
6.07
1.00
14
21 CPU-A
3.27 × 10−7
1.00
6.07
1.00
15
31 CPU-A
3.27 × 10−7
1.00
6.07
1.00
16
41 CPU-A
3.27 × 10−7
1.00
6.07
1.00
Note. X (X = 1, 2, 3, 4) represents channels. XY (X = 1, 2, 3, 4; Y = 1, 2) represents subchannels. ACM-1, 2, 3 represent ACMs for three sensor signals; CPU-A represents the main CPU in the subchannel.
