Containment Depressurization Capabilities of Filtered Venting System in 1000 MWe PWR with Large Dry Containment

Table 4

LBLOCA sequence of event.

Event summary	No CFVS	CFVS @ 0.9 MPa	CFVS @ 0.5 MPa
Cold leg LBLOCA occurs; Rx Scram; No CTMT spray/aux feed available	0.0 sec
PZR empty	7.0 sec
Core uncovery	8.0 sec
Accumulator empty	41.0 sec
Relocation to lower head	1.4 Hrs
Vessel failure	2.4 Hrs
CFVS opening/closing		28 Hrs/30.3 Hrs; 88.1 Hrs/90.2 Hrs; 151.8 Hrs/153.8 Hrs	4.4 Hrs/14.0 Hrs; 68.0 Hrs/73.3 Hrs; 137.5 Hrs/141.9 Hrs
Containment failure	53.8 Hrs	No fail	No fail
Calc. end	168 Hr