Containment

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

• Containment building

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