The Investigation of Nonavailability of Passive Safety Systems Effects on Small Break LOCA Sequence in AP1000 Using RELAP5 MOD 4.0

Table 3

Accident sequence during small break LOCA.

Safety system actuation	Time (s)
LOCA starts	0
Reactor trip	4.9
Generation of “S” signal	6.7
Primary coolant pumps trip	12.7
Accumulator injection	95.2
ADS-1 actuation	735
ADS-2 actuation	805
ADS-3 actuation	925
ADS-4 actuation	1270
IRWST injection	1786