Open Access

Table 6

Sequence of small break loss of coolant accident.

Time Event
0 s Small break (10 mm diameter) on DVI line B
188 s Low PRZ level leads to CMTs injection, PPHX actuation and coolant pumps stop
190 s Reactor scram triggered by pumps low speed (90%)
193 s Low PRZ pressure actuates reactor protection signal which triggers secondary lines isolation
194 s Emergency condensers are connected to SGs
5 min Apparition of a vapour phase in vessel upper head. Bulk boiling occurs in the reactor vessel
25 min Flashing of water into steam in the CMTs
47 min Low CMT levels actuate ADS opening
58 min ADS final stage opening
59 min Break flow turns into vapour phase. Beginning of accumulators injection (finished 100 s later)
1 h 4 min Beginning of safety tanks injection
2 h 47 min End of simulation

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