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

Table 3

Extended SBO sequence of event.

Event summary	No CFVS	CFVS @ 0.9 MPa	CFVS @ 0.5 MPa
SBO occurs; Rx Scram; No ECCS/spray/aux feed available	0.0 sec
2nd safetyv cycling	9.0 sec
SG dryout	50 min
Primary safety valve cycling	50 min
Core uncover	1.6 Hr
CET > 1200 F (SAMG entry)	2.0 Hr
Vessel failure	3.3 Hr
CFVS opening/closing	—	36.8 Hrs/39.0 Hrs; 90.1 Hrs/92.2 Hrs	8.4 Hrs/17.5 Hrs; 74.6 Hrs/80.0 Hrs; 149.2 Hrs/153.5 Hrs
Containment failure	58.4 Hrs	No fail	No fail
Calc. end	168 Hr