Sequence of turbine trip accident.
|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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