Extended Station Blackout Coping Capabilities of APR1400

Table 3

Major sequences of events.

Event	SBO w/o TDP	SBO w/ TDP	Secondary injection	Primary injection
Rx trip	0.0 sec	0.0 sec	0.0 sec	0.0 sec
Main steam safety valve open	8.5 sec	8.5 sec	8.5 sec	8.5 sec
TDP actuation	—	1800 sec	1800 sec	1800 sec
TDP termination	—	8.5 hrs	8.5 hrs	8.5 hrs
SG dryout	1.2 hrs	10.9 hrs	10.9 hrs	10.9 hrs
POSRV open	1.3 hrs	11.6 hrs	11.6 hrs	11.6 hrs
Core uncovered	1.9 hrs	12.0 hrs	12.0 hrs	12.0 hrs
SAMG entry	2.2 hrs	12.6 hrs	12.6 hrs	12.6 hrs
External injection	—	—	13.1 hrs	13.1 hrs
SIT actuation	—	—	14.8 hrs	13.6 hrs
Relocation to lower head	3.7 hrs	15.0 hrs	—	—
Rx failure	3.7 hrs	15.0 hrs	—	—