Research Article
Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-Tree/Fault-Tree (ET/FT) Method
Table 3
Probabilities of the RPS failing to generate a trip signal on demand.
| | Signal type | CCFs included | CCFs excluded | | Mean | 5th perc. | 95th perc. | Mean | 5th perc. | 95th perc. |
| | Analog | 8.94 × 10−7 | 3.49 × 10−8 | 2.86 × 10−6 | 4.54 × 10−12 | 1.23 × 10−12 | 8.57 × 10−11 | | Digital | 2.60 × 10−7 | 1.02 × 10−8 | 7.57 × 10−7 | 1.03 × 10−13 | 2.91 × 10−14 | 1.97 × 10−12 | | Thermocouple | 1.47 × 10−6 | 5.98 × 10−8 | 4.63 × 10−6 | 2.12 × 10−11 | 5.74 × 10−12 | 3.83 × 10−10 |
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