Containment

Containment refers to several layers of structure meant to contain reactor coolant during design bases accidents. Containment starts after the reactor vessel.

The main two systems is Primary Containment meant to contain liquid coolant outside the reactor vessel and Secondary Containment meant to contain gas effluent.

• Ambient Pressure (24)
• Mark I (17)
• Mark II (6)
• Ice condenser (4)
• Mark III (4)
• Subatmospheric (3)

Primary Containment subsystems

• Drywell
• Suppression Pool
• Primary Containment Valves

Secondary Containment subsystems

• Reactor Building / Steam Dome
• Standby Gas Treatment

	Containment type	Region	State	Reactor type
Millstone	Ambient Pressure Subatmospheric	NRC Region 1	Connecticut	CE GE-3 Westinghouse PWR 4-Loop
Calvert Cliffs	Ambient Pressure	NRC Region 1	Maryland	CE
Seabrook	Ambient Pressure	NRC Region 1	New Hampshire	Westinghouse PWR 4-Loop
Salem	Ambient Pressure	NRC Region 1	New Jersey	Westinghouse PWR 4-Loop
Indian Point	Ambient Pressure	NRC Region 1	New York	Westinghouse PWR 4-Loop
Ginna	Ambient Pressure	NRC Region 1	New York	Westinghouse PWR 2-Loop
Three Mile Island	Ambient Pressure	NRC Region 1	Pennsylvania	B&W-L-LP
Farley	Ambient Pressure	NRC Region 2	Alabama	Westinghouse PWR 3-Loop
Saint Lucie	Ambient Pressure	NRC Region 2	Florida	CE
Turkey Point	Ambient Pressure	NRC Region 2	Florida	Westinghouse PWR 3-Loop AP1000
Vogtle	Ambient Pressure	NRC Region 2	Georgia	W-AP1000 Westinghouse PWR 4-Loop
Harris	Ambient Pressure	NRC Region 2	North Carolina	Westinghouse PWR 3-Loop
Oconee	Ambient Pressure	NRC Region 2	South Carolina	B&W-L-LP
Summer	Ambient Pressure	NRC Region 2	South Carolina	Westinghouse PWR 3-Loop
Robinson	Ambient Pressure	NRC Region 2	South Carolina	Westinghouse PWR 3-Loop
Byron	Ambient Pressure	NRC Region 3	Illinois	Westinghouse PWR 4-Loop
Braidwood	Ambient Pressure	NRC Region 3	Illinois	Westinghouse PWR 4-Loop
Palisades	Ambient Pressure	NRC Region 3	Michigan	CE
Prairie Island	Ambient Pressure	NRC Region 3	Minnesota	Westinghouse PWR 2-Loop
Davis Besse	Ambient Pressure	NRC Region 3	Ohio	B&W-R-LP
Point Beach	Ambient Pressure	NRC Region 3	Wisconsin	Westinghouse PWR 2-Loop
Palo Verde	Ambient Pressure	NRC Region 4	Arizona	CE
Arkansas Nuclear	Ambient Pressure	NRC Region 4	Arkansas	CE B&W-L-LP
Diablo Canyon	Ambient Pressure	NRC Region 4	California	Westinghouse PWR 4-Loop
Wolf Creek	Ambient Pressure	NRC Region 4	Kansas	Westinghouse PWR 4-Loop
Waterford	Ambient Pressure	NRC Region 4	Louisiana	CE
Callaway	Ambient Pressure	NRC Region 4	Missouri	Westinghouse PWR 4-Loop Evolutionary Power Reactor
Fort Calhoun	Ambient Pressure	NRC Region 4	Nebraska	CE
South Texas	Ambient Pressure	NRC Region 4	Texas	Westinghouse PWR 4-Loop
Comanche Peak	Ambient Pressure	NRC Region 4	Texas	Westinghouse PWR 4-Loop Advanced Pressurized Water Reactor
McGuire	Ice condenser	NRC Region 2	North Carolina	Westinghouse PWR 4-Loop
Catawba	Ice condenser	NRC Region 2	South Carolina	Westinghouse PWR 4-Loop
Watts Bar	Ice condenser	NRC Region 2	Tennessee	Westinghouse PWR 4-Loop
Sequoyah	Ice condenser	NRC Region 2	Tennessee	Westinghouse PWR 4-Loop
Cook	Ice condenser	NRC Region 3	Michigan	Westinghouse PWR 4-Loop
Fukushima Dai-Ichi	Mark I Mark II	Japan	Fukushima Dai-Ichi	GE-4 GE-5 GE-3
Pilgrim	Mark I	NRC Region 1	Massachusetts	GE-3
Hope Creek	Mark I	NRC Region 1	New Jersey	GE-4
Oyster Creek	Mark I	NRC Region 1	New Jersey	GE-2
FitzPatrick	Mark I	NRC Region 1	New York	GE-4
Nine Mile Point	Mark I Mark II	NRC Region 1	New York	GE-5 GE-2 European Pressurized Reactor
Peach Bottom	Mark I	NRC Region 1	Pennsylvania	GE-4 HTGR
Vermont Yankee	Mark I	NRC Region 1	Vermont	GE-4
Browns Ferry	Mark I	NRC Region 2	Alabama	GE-4
Hatch	Mark I	NRC Region 2	Georgia	GE-4
Brunswick	Mark I	NRC Region 2	North Carolina	GE-4
Dresden	Mark I	NRC Region 3	Illinois	GE-3 GE-1
Duane Arnold	Mark I	NRC Region 3	Iowa	GE-4
Fermi	Mark I	NRC Region 3	Michigan	GE-4 Economic Simplified Boiling Water Reactor
Monticello	Mark I	NRC Region 3	Minnesota	GE-3
Quad Cities	Mark I	NRC Region 4	Illinois	GE-3
Cooper	Mark I	NRC Region 4	Nebraska	GE-4
Shoreham	Mark II	NRC Region 1	New York	GE-5
Susquehanna	Mark II	NRC Region 1	Pennsylvania	GE-4
Limerick	Mark II	NRC Region 1	Pennsylvania	GE-4
LaSalle	Mark II	NRC Region 3	Illinois	GE-5
Columbia	Mark II	NRC Region 4	Washington	GE-5
Clinton	Mark III	NRC Region 3	Illinois	GE-6
Perry	Mark III	NRC Region 3	Ohio	GE-6
River Bend	Mark III	NRC Region 4	Louisiana	GE-6 Economic Simplified Boiling Water Reactor
Grand Gulf	Mark III	NRC Region 4	Mississippi	GE-6
Beaver Valley	Subatmospheric	NRC Region 1	Pennsylvania	Westinghouse PWR 3-Loop
Surry	Subatmospheric	NRC Region 2	Virginia	Westinghouse PWR 3-Loop
North Anna	Subatmospheric	NRC Region 2	Virginia	Westinghouse PWR 3-Loop