Research Article
PSO Based Optimization of Testing and Maintenance Cost in NPPs
Table 7
Constraint on preventive maintenance intervals.
| Maintenance period | Valve | Pump | Relationship | Permitted range |
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| V1–V7 — | — PA, PB, PC | = · — | 2 ≤ ≤ 20 | 720 ≤ ≤ 20280 | 720 ≤ ≤ 20280 |
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