Research Article
Analysis of Loss of Flow Events on Brazilian Multipurpose Reactor Using the Relap5 Code
Table 1
Initiating Events Frequency for OPAL Reactor (adapted from [
26]).
| | Group/ID | Description | Initiating event frequency (per year) | | 5th percentile | Mean | 95th percentile |
| | A | Reactivity transients | 7.3 × 10−4 | 1.6 × 10−3 | 3.1 × 10−3 | | B | Loss of flow | | | | | B/B1 | Core bypass | 2.9 × 10−7 | 7.4 × 10−5 | 2.6 × 10−4 | | B/B2 | Loss of main power supply | 2.0 | 3.0 | 4.2 | | B/B3 | Primary pump failure | 4.6 × 10−2 | 7.0 × 10−2 | 9.9 × 10−2 | | B/B4 | Primary isolation valve undesired closure | 3.4 × 10−5 | 2.8 × 10−4 | 8.5 × 10−4 | | B/B5 | Fuel channel local blockage | | 1.3 × 10−5 | | | C | Loss of coolant | 1.2 × 10−6 | 3.0 × 10−4 | 1.1 × 10−3 | | D | Loss of heat sink | 1.2 × 10−2 | 4.4 × 10−2 | 1.4 × 10−1 | | E | Mechanical damage to fuel assemblies | 3.0 × 10−4 | 3.0 × 10−2 | 3.0 × 10−2 | | F | Heavy water leak | | | | | G | Events related to reactor utilization | 7.4 × 10−5 | 1.5 × 10−4 | 1.1 × 10−3 |
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