Open Access
Table 4
Sequence of turbine trip accident.
| Time | Event |
|---|---|
| 0 s | Turbine trip |
| 0.15 s | Steam line and feedwater line isolation |
| 3 s | Station blackout. Coolant pumps coast down with their inertia. Minimum DNBR is reached (3.87) |
| 4.6 s | Reactor scram actuated by pumps low speed |
| 6 s | Emergency condensers are connected to SGs |
| 7.3 s | Maximum primary pressure and temperature are reached (167 bar, 322 °C) |
| 14 s | Maximum secondary pressure and temperature are reached (83 bar, 298 °C) |
| 8 min | Heat removed by ECs becomes greater than heat removed by SGs which is greater than decay heat |
| 90 min | Low pressurizer level leads to CMTs injection and passive primary cooling actuation |
| 100 min | Primary temperature falls below 215 °C |
| 150 min | CMTs natural circulation stops |
| 167 min | End of simulation |
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