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Table 5

Sequence of large break loss of coolant accident (LOCA).

Time Event
0 s Double-ended guillotine break of cold leg A
0.1 s Chain reaction is stopped by lack of moderation
3 s Low PRZ pressure causes a reactor protection signal
3.15 s Steam line and feedwater line isolation
4 s Reactor scram
4.5 s Reactor vessel has lost all coolant
5 s Opening of CMT injection valves
5.5 s Accumulators injection starts
6 s Coolant pumps stop on their inertia
9 s Passive primary cooling actuation
9.5 s Emergency condensers (ECs) are connected to steam generators (SGs)
45 s Maximum clad surface temperature reached (725 °C)
77 s End of accumulators injection
98 s CMTs injection starts
13 min CMTs low level causes opening of the ADS 1st stage
15 min Opening of the ADS 2nd stage
16 min Core is flooded again by primary coolant
43 min Opening of the ADS final stage
90 min End of simulation

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