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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