🇺🇸

USA

Nuclear reactor fleet

Total reactors

Operating

Operating capacity

2,234 MWe

Pipeline

4,286 MWe

Operating (12)

Reactor	Type	MWe	Operator	Status
Advanced Test Reactor (ATR)	Tank	—	Idaho National Laboratory	Operating
High Flux Isotope Reactor (HFIR)	Flux trap	—	Oak Ridge National Laboratory	Operating
Kansas State University TRIGA (TRIGA Mark II)	TRIGA	—	Kansas State University	Operating
Missouri University Research Reactor (MURR)	Pool	—	University of Missouri	Operating
MIT Research Reactor (MITR-II)	Tank	—	Massachusetts Institute of Technology	Operating
NIST Center for Neutron Research (NCNR)	Pool	—	National Institute of Standards and Technology	Operating
Oregon State TRIGA Reactor (OSTR)	TRIGA	—	Oregon State University	Operating
Penn State Breazeale Reactor (PSBR)	TRIGA	—	Penn State University	Operating
Rhode Island Nuclear Science Center (RINSC)	Pool	—	Rhode Island Nuclear Science Center	Operating
Transient Reactor Test Facility (TREAT)	Graphite	—	Idaho National Laboratory	Operating
Vogtle Unit 3	AP1000	1,117	—	Operating
Vogtle Unit 4	AP1000	1,117	—	Operating

Reactor	Type	MWe	Operator	Status
Aalo-X	Sodium-cooled fast reactor	10	—	Construction
Aurora	Sodium-cooled fast reactor	15	—	Construction
Aurora (Oklo)	Microreactor	15	—	Construction
Hermes	Fluoride salt-cooled reactor	35	—	Construction
Isotope Production Reactor	Heat pipe microreactor	—	—	Construction
Mark-0	Sodium heat pipe microreactor	—	—	Construction
Palisades	PWR	805	—	Construction

Reactor	Type	MWe	Operator	Status
Autonomous Microreactor	Heat pipe microreactor	—	—	Conceptual
BANR	Heat pipe microreactor	2	—	Conceptual
EM2	Gas-cooled fast reactor	265	—	Conceptual
Gen4 Module	Lead-bismuth fast reactor	25	—	Conceptual
Gravity Nuclear Reactor	Borehole fast reactor	10	—	Conceptual
Halo MMR	Pressurized water reactor	—	—	Conceptual
Kaleidos	TRISO gas-cooled microreactor	1	—	Conceptual
LFTR	Liquid fluoride thorium reactor	—	—	Conceptual
Micro-Modular Reactor	TRISO gas-cooled microreactor	15	—	Conceptual
Microreactor	Heat pipe microreactor	—	—	Conceptual
NARES	Fluoride salt-cooled reactor	—	—	Conceptual
Orbitron	Inertial electrostatic confinement	—	—	Conceptual
SMR-160	Integral PWR	160	—	Conceptual
Transportable Microreactor (Deployable Energy)	Heat pipe microreactor	—	—	Conceptual
Transportable Microreactor (REPLOY)	Heat pipe microreactor	—	—	Conceptual
ZEUS / ODIN	Heat pipe microreactor	2	—	Conceptual
AP300	Pressurized water reactor	300	—	Planned
BWRX-300 (GEH, multiple sites)	BWR-SMR	300	—	Planned
eVinci	Heat pipe microreactor	5	—	Planned
Hermes (Kairos Power)	FHR-SMR	35	—	Planned
Natrium	Sodium-cooled fast reactor	345	—	Planned
Natrium (TerraPower, Kemmerer WY)	SFR	345	—	Planned
NEXT Lab MSR	Molten salt reactor	1	—	Planned
SMR-300	Integral PWR	300	—	Planned
SMR-300 (Holtec)	PWR-SMR	300	—	Planned
Three Mile Island Unit 1 (restart)	PWR	835	—	Planned
Xe-100	Pebble bed HTGR	80	—	Planned
Xe-100 (X-energy / Dow)	HTGR-SMR	80	—	Planned

Reactor	Type	MWe	Operator	Status
VOYGR	Integral PWR	77	—	Cancelled