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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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