Research Article
Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-Tree/Fault-Tree (ET/FT) Method
Table 6
Importance and sensitivity of the selected parameters on system risk.
| | Number | Parameter | Value | FC | RDF | RIF | Sens |
| | 1 | TI | 6 months | 1.00 | 1.57 × 109 | 1.12 × 106 | 1.00 × 102 | | 2 | λUU (ACM) | 1.25 × 10−8/h | 1.00 | 6.98 × 105 | 1.12 × 106 | 1.00 × 102 | | 3 | MTTR | 4 h | 1.01 × 10−4 | 1.00 | 1.10 × 102 | 1.00 | | 4 | λD (ACM) | 2.52 × 10−6/h | 1.01 × 10−4 | 1.00 | 4.42 | 1.00 | | 5 | λUU (AI) | 9.95 × 10−9/h | 1.32 × 10−6 | 1.00 | 9.12 × 103 | 1.00 | | 6 | λUU (CPU) | 1.30 × 10−8/h | 7.19 × 10−7 | 1.00 | 1.01 × 103 | 1.00 | | 7 | λUU (DO) | 1.24 × 10−9/h | 7.25 × 10−8 | 1.00 | 8.24 × 101 | 1.00 | | 8 | λUU (COM) | 1.11 × 10−9/h | 7.00 × 10−8 | 1.00 | 1.43 × 102 | 1.00 | | 9 | λUU (EXT) | 1.11 × 10−9/h | 7.00 × 10−8 | 1.00 | 1.43 × 102 | 1.00 | | 10 | λD (EXT) | 6.75 × 10−7/h | 4.07 × 10−8 | 1.00 | 2.73 × 101 | 1.00 |
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