List of nuclear research reactors
This is an annotated list of all the nuclear research reactors in the world, sorted by country, with operational status. For power reactors, see List of nuclear reactors.
Algeria
- Es Salam, 15 MW heavy-water nuclear reactor for research, located in Aïn Oussera, in service since 1993
- Nur, research reactor built by Argentine INVAP
Antarctica
Argentina
Name | Location | Reactor type | Purpose | Status | Capacity | Construction start date | Operation date | Closure | Operator and owner |
RA-0 | Tank type | 0.001 | 1958 | Universidad Nacional de Córdoba | |||||
RA-1 Enrico Fermi | Tank type | 40 | May 1957 | 17 January 1958 | National Atomic Energy Commission | ||||
RA-2 | Critical assembly type | 0.03 | 19 July 1966 | September 1983 | National Atomic Energy Commission | ||||
RA-3 | Pool type | 10,000 | 20 December 1967 | National Atomic Energy Commission | |||||
RA-4 | HOMOG type | 0.001 | September 1971 | Universidad Nacional de Rosario | |||||
RA-6 | Pool type | 3,000 | 1 September 1978 | 23 September 1982 | National Atomic Energy Commission | ||||
RA-8 | Critical assembly type | 0.01 | 16 June 1997 | 2001 | National Atomic Energy Commission | ||||
RA-10 | 30,000 | March 2016 | National Atomic Energy Commission |
Australia
- High Flux Australian Reactor, a 10 MW DIDO class reactor in Lucas Heights, New South Wales that produced nuclear medicine for the diagnosis and treatment of major diseases such as cancer and heart disease. HIFAR also produced neutron beams for research, particularly neutron diffraction analysis of crystal structures, and irradiation facilities for various purposes especially materials testing and chemical analysis. It first went critical on 26 January 1958, was shut down in January 2007 and is currently under a care and maintenance program.
- MOATA, 100 kW Argonaut class reactor, dismantled in 2009.
- Open-pool Australian lightwater reactor, 20 MW, a replacement for the High Flux Australian Reactor supplied by INVAP of Argentina. This facility first went critical at 11.25pm on 12 August 2006 and achieved full power for the first time on 3 November 2006.
Austria
- Austrian Research Centers at Seibersdorf — 10 MW ASTRA research reactor
- Atomic Institute of the Austrian Universities in Vienna — 250 kW TRIGA Mark II research reactor
- Reactor Institute of the Technical University in Graz — 10 kW Siemens Argonaut research reactor
Bangladesh
- Savar – TRIGA Mark II, Atomic Energy Research Establishment
Belarus
- Sosny, Minsk
- * IRT research reactor
- * "Pamir" - mobile nuclear power reactor test
Belgium
- BR-1 – 4MWt air-cooled, graphite moderated research reactor at SCK•CEN, Mol
- BR-2 – 125MWt water-cooled, beryllium moderated material testing research reactor at SCK•CEN, Mol
- BR-3 – 11MWe PWR reactor at SCK•CEN, Mol
- VENUS – zero power critical facility, converted to GUINEVERE, at SCK•CEN, Mol
- GUINEVERE – fast, accelerator driven, lead-cooled reactor at SCK•CEN, Mol
- Thetis reactor – 250kWt pool type reactor at Ghent university
Brazil
- IEA-R1 – 5MW Pool-type reactor, – IPEN-Instituto de Pesquisas Energéticas e Nucleares, São Paulo
- IPR-R1 – 250 kW TRIGA Mark I, – CDTN-Centro de Desenvolvimento de Tecnologia Nuclear, Belo Horizonte
- ARGONAUTA – 100 kW Argonaut class reactor, – IEN-Instituto de Engenharia Nuclear, Rio de Janeiro
- IPEN/MB-01 – 0.1 kW Critical assembly, – IPEN-Instituto de Pesquisas Energéticas e Nucleares, São Paolo
Bulgaria
- Bulgarian Academy of Sciences – IRT-200 research reactor, partially decommissioned in 2009, shut down
Canada
Name | Reactor Type | Status | Capacity | Operation Date | Closure | Operator and Owner | Notes |
MAPLE 1 | Medical isotope production reactor | Never Operated | 2000 | Chalk River Laboratories | Incomplete commissioning, never completed testing. However, criticality was achieved | ||
MAPLE 2 | Medical isotope production reactor | Never Operated | 2003 | Chalk River Laboratories | Incomplete commissioning, never completed testing. However, criticality was achieved | ||
NRU | Heavy water cooled/moderated | Shut Down | 135 MW | 1957 | 2018 | Chalk River Laboratories | |
NRX | Heavy water moderated, light water cooled | Shut Down | 42 MW | 1947 | 1993 | Chalk River Laboratories | One of the highest flux reactors in the world until shut down |
SLOWPOKE-1 prototype | Pool Type | Shut Down | 5 kW | Chalk River Laboratories, University of Toronto | The prototype was moved to the University of Toronto in 1971 | ||
PTR | Pool type | Shut Down | 1990 | Chalk River Laboratories | |||
ZED-2 | Operational | 200 Wth | 1960 | Chalk River Laboratories | |||
ZEEP | Heavy water | Shut Down | 0 | 1945 | 1973 | Chalk River Laboratories | The first nuclear reactor in Canada, and first outside the United States |
WR-1 | Organiclly-cooled CANDU | Shut Down | 1965 | 1985 | Whiteshell Laboratories | Coolant leak of 2,739 litres in Nov. 1978. | |
SLOWPOKE-3 demonstration | Pool type | Shut Down | 2 MWth | 1987 | 1989 | Whiteshell Laboratories | |
SLOWPOKE-2 | Pool type | Operational | 0 | 1981 | Saskatchewan Research Council | On 17 January 2018, the reactor surpassed 20,000 hours of operation | |
SLOWPOKE-2 | Pool type | Shut Down | 20 kW | 1984 | 1989 | Nordion | |
SLOWPOKE-2 prototype | Pool type | Shut Down | 20 kW | 1971 | Tunney's Pasture | ||
SLOWPOKE-2 | Pool type | Shut Down | 20 kW | 1976 | Dalhousie University | ||
Pool type | Operational | 0 | 1976 | École Polytechnique de Montréal | |||
McMaster Nuclear Reactor | SLOWPOKE-2 pool type | Operational | 5 MWth | 1959 | McMaster University | ||
SLOWPOKE-2 | Pool type | Operational | 20 kW | 1985 | Royal Military College | ||
SLOWPOKE-2 | Pool type | Shut Down | 20 kW | 1977 | 2017 | University of Alberta | |
SLOWPOKE-2 | Pool type | Shut Down | 20 kW | 1976 | 2001 | University of Toronto | Rebuilt from SLOWPOKE-1 |
Chile
- RECH 1 – Pool-type reactor, 5 MW MTR – Comisión Chilena de Energía Nuclear, Santiago
- RECH 2 – Pool-type reactor, 10 MW MTR – Comisión Chilena de Energía Nuclear, Santiago, currently in extended shutdown
China
- CEFR Chinese Experimental Fast Reactor. Located at CIAE Beijing, construction started May 2000, first criticality July 2010.
Colombia
- Bogotá – IAN-R1, 100 kW – TRIGA, Institute of Nuclear Science
Democratic Republic of the Congo
- TRICO I – TRIGA reactor, CREN-K, 50 kW
- TRICO II – TRIGA reactor, CREN-K, 1 MW
Czech Republic
- Řež – 2 research reactors
- Prague – training reactor VR-1 at Czech Technical University
Denmark
- Risø – DR-3 DIDO class experimental reactor
- Risø – DR-2 experimental reactor
- Risø – DR-1 experimental reactor
Egypt
- Nuclear Research Center at Inshas:
- * ETRR-1 – 2 MW LWR
- * ETRR-2 – 22 MW reactor, built by Argentine INVAP
Estonia
- Paldiski – 2 PWR naval training reactors
Finland
- FiR 1 – TRIGA Mark II, VTT Technical Research Centre of Finland, Espoo
France
- Zoé, the first French nuclear reactor
- Eau lourde n°2
- Aquilon
- Eau lourde n°3
- Rubéole
- Mélusine
- Proserpine
- PEG
- Alizé
- Minerve
- Triton
- Néréide
- Marius
- Ulysse
- Peggy
- Rachel
- Siloé
- Pégase
- Siloette
- Prototype à terre
- Cesar
- Marius
- Harmonie
- Osiris
- Réacteur universitaire de Strasbourg
- Rhapsodie
- Eau lourde n°4
- Celestin I
- Celestin II
- Prospero
- Caliban
- Phénix
- Silène
- Chaufferie avancée prototype
- Phébus
- Réacteur nouvelle génération
- Azur at Cadarache
- Cabri at Cadarache
- Eole at Cadarache
- Isis at Saclay Nuclear Research Centre
- Masurca at Cadarache
- Réacteur à Haut Flux at Institut Laue-Langevin, currently the world's most intense source of neutrons and the source of the most intense neutron flux
- Minerve at Cadarache
- Orphée at Saclay Nuclear Research Centre
Germany
- AKR II – Ausbildungskernreaktor II, Technische Universität Dresden; rating: 2 W, commissioned 2005
- AVR – Arbeitsgemeinschaft Versuchsreaktor, Forschungszentrum Jülich; rating: 15 MW, commissioned 1969; closed 1988
- BER II – Berliner-Experimentier-Reaktor II, Helmholtz-Zentrum Berlin für Materialien und Energie; rating: 10 MW, commissioned 1990
- FRG-1 – Geesthacht; rating: 5 MW, commissioned 1958
- FRM II – Technische Universität München; rating: 20 MW, commissioned 2004
- FRMZ – TRIGA of the University of Mainz, Institute of Nuclear Chemistry; continuous rating: 0.10 MW, pulse rating for 30ms: 250 MW; commissioned 1965
- FR2 - Forschungsreaktor 2; rating: 44 MW; commissioned 1957; closed: 1981
Planned
- Wyhl, planned nuclear plant that was never built because of long-time resistance by the local population and environmentalists.
Greece
- GRR-1 – 5 MW research reactor at Demokritos National Centre for Scientific Research, Athens.
Hungary
- Budapest
- * Technical University of Budapest –
- * KFKI Atomic Energy Research Institute –
India
- Bhabha Atomic Research Center – Trombay
- * Apsara reactor – Asia's first nuclear reactor. 1 MW, pool type, light water moderated, enriched uranium fuel supplied by France
- * CIRUS reactor – 40 MW, supplied by Canada, heavy water moderated, uses natural uranium fuel
- * Dhruva reactor – 100 MW, heavy water moderated, uses natural uranium fuel
- * Purnima series
- Indira Gandhi Center for Atomic Research – Kalpakkam
- *PFBR – 500MWe Sodium cooled fast breeder nuclear reactor, under construction. Expected completion 2015.
- * FBTR – 40 MW Fast Breeder Test Reactor, uses mixed carbide fuel
- * KAMINI –30 kW, uses U-233 fuel
Indonesia
- Bandung – TRIGA Mark II
- Yogyakarta – TRIGA Mark II
- Serpong, South Tangerang – SIWABESSY 30MWh Multi-Purpose Reactor
Iran
- Tehran – AMF reactor at Tehran Nuclear Research Center
- Isfahan, Nuclear Technology Center
- * MNSR – 27 kW Miniature Neutron Source Reactor
- * Light Water Subcritical Reactor
- * Heavy Water Zero Power Reactor
- * Graphite Subcritical Reactor
- Arak – IR-40 Heavy water-moderated reactor
Iraq
- IRT-5000 5 MW Destroyed in Operation Desert Storm and Operation Iraqi Liberation
- Tamuz-1 40 MW thermal tank-pool research reactor. Destroyed in Operation Scorch Sword and Operation Opera
- Tamuz-2 500 KW ISIS neutron modelling module. Destroyed in Operation Desert Storm and Operation Iraqi Liberation
Israel
- Negev Nuclear Research Center – EL-102 uranium/heavy water research reactor, originally 24 MW
- Soreq Nuclear Research Center – 5 MW light water research reactor
Italy
- Brasimone – PEC : ENEA Ente Nazionale Energia Atomica - National Atomic Energy Agency - Brasimone Research Center
- Ispra – ISPRA-1 : European Commission Joint Research Centre
- Ispra – ECO : European Commission Joint Research Centre
- Ispra – ESSOR : European Commission Joint Research Centre
- Legnaro - RTS-1: INFN Istituto Nazionale di Fisica Nucleare - National Institute for Nuclear Physic
- Milano - L-54 : CeSNEF Centro Studi Nucleari "Enrico Fermi" - Politecnico di Milano
- Montecuccolino - RB-1 : University of Bologna
- Montecuccolino - RB-2 : University of Bologna
- Montecuccolino - RB-3 - Aquilone 11 : University of Bologna
- Pavia – TRIGA LENA : University of Pavia
- Palermo - AGN-201 "Costanza" : University of Palermo
- Saluggia - AVOGADRO RS-1 : FIAT/Montecatini
- San Piero a Grado – RTS-1 "Galileo Galilei" : CAMEN Centro Applicazioni Militari Energia Nucleare - Center for Military Applications of Nuclear Energy
- Santa Maria di Galeria – ROSPO-2 : ENEA Ente Nazionale Energia Atomica - Casaccia Research Center
- Santa Maria di Galeria – TRIGA RC-1 : ENEA Ente Nazionale Energia Atomica - Casaccia Research Center
- Santa Maria di Galeria – RC-4 RITMO : ENEA Ente Nazionale Energia Atomica - Casaccia Research Center
- Santa Maria di Galeria – RANA : ENEA Ente Nazionale Energia Atomica - Casaccia Research Center
- Santa Maria di Galeria – TAPIRO : ENEA Ente Nazionale Energia Atomica - Casaccia Research Center
Jamaica
- SLOWPOKE-2 reactor – Kingston, Jamaica
Japan
- Japan Atomic Energy Agency Reactors
- * Tōkai JRR-1
- * Tōkai JRR-2
- * Tōkai JRR-3
- * Tōkai JRR-4
- * Tōkai JPDR
- * Ōarai High-temperature engineering test reactor
- * Ōarai JMTR
- * Naka JT-60 fusion reactor
- * Nuclear Safety Research Reactor
- * Fugen
- * Jōyō
- * Monju
- Kinki University
- * UTR-KINKI
- Kyoto University
- * KUR
- Musashi Institute of Technology
- * MITRR
- Rikkyo University
- * RUR
- University of Tokyo
- * Yayoi
Jordan
- Jordan University of Science and Technology – Ar Ramtha
- * Jordan Research and Training Reactor – Jordan's first nuclear reactor, 5 MW research reactor, supplied by South Korea, first critical 2015, operational 2016.
Kazakhstan
- Alatau, Institute of Nuclear Physics of the National Nuclear Center
- * VVR-K – 10 MWe reactor
- Kurchatov, National Nuclear Center, Semipalatinsk Test Site
- * IVG-1M – 60 MW reactor
- * RA – zirconium hydride moderated reactor
- * IGR – 50 MW reactor
Latvia
- Salaspils, Nuclear Research Center
- *5 MWe research reactor
Libya
- Tajura Nuclear Research Center, REWDRC – 10 MW research reactor
Malaysia
- Kuala Lumpur - TRIGA Mark II, Malaysian Institute of Nuclear Technology Research
Mexico
- Mexico City - TRIGA Mark III, National Institute for Nuclear Research
- Mexico City - National Polytechnic Institute - "Nuclear-Chicago Modelo 9000" subcritical research reactor
- Zacatecas - Autonomous University of Zacatecas - Subcritical research reactor
Morocco
- Rabat - TRIGA
Netherlands
- Reactor Institute Delft, part of Delft University of Technology
- Petten nuclear reactor in Petten
- Biologische Agrarische Reactor Nederland, part of Wageningen University, shut down in 1980
- ATHENE nuclear reactor, at the Eindhoven University of Technology, shut down
- KEMA Suspensie Test Reactor, test reactor at KEMA, Arnhem, disassembled 2003
North Korea
- Yongbyon
- * IRT-2000 - 8 MW heavy-water moderated research reactor
- * Yongbyon 1 - 5 MWe Magnox reactor, provides power and district heating
Norway
- Kjeller reactors
- * NORA
- * JEEP I
- *JEEP II
- Halden Reactor
- * HBWR - Halden boiling water reactor
Pakistan
Reactor | Type | MW | Location | Status |
PARR I | Pool-type reactor | 10 | Islamabad | Operational since 1965 |
PARR II | Pool-type reactor | 30 kW | Islamabad | Operational since 1974 |
Not under IAEA safeguards
Reactor | Type | MW | Location | Status |
Khushab-I | HWR | Classified. Estimated: 50-70 | Khushab | Operational since 1998 |
Khushab-II | HWR | Classified | Khushab | Operational since 2010 |
Khushab-III | HWR | Classified | Khushab | Under construction |
Khushab-IV | HWR | Classified | Khushab | Under construction |
Panama
- USS Sturgis - floating nuclear power plant for Panama Canal
Peru
- RP-0 - 1 W critical assembly, located in Lima, built by Argentine INVAP. First criticality in 1978.
- RP-10 - 10 MW pool-type material test reactor, located in Huarangal built by Argentine INVAP. First criticality in 1989.
Philippines
- PRR-1 - 3 MW TRIGA-converted reactor, Quezon City. Managed by the Philippine Nuclear Research Institute. 1st criticality in August 1963, reactor conversion in March 1984, criticality after conversion in April 1988, shut down since 1988 for pool repairs, on extended shutdown at present.
Poland
- Ewa reactor - 10 MW VVR-SM research reactor
- Maria reactor - 30 MW research reactor
- Anna reactor - 10 kW research reactor
- Agata reactor - 10 W zero-power research reactor
- Maryla reactor - 100 W zero-power research reactor
- UR-100 reactor - 100 kW training reactor
Portugal
- Sacavem - RPI, Portuguese Research Reactor - 1 MW pool type, Instituto Tecnológico e Nuclear
Puerto Rico
- Mayagüez - TRIGA reactor
- Boiling Nuclear Superheater Reactor Facility, BONUS - superheated BWR. Listed on the U.S. National Register of Historic Places.
Romania
- Institute for Nuclear Research, Mioveni, 110 km northwest of Bucharest - TRIGA reactor
- National Institute for Research and Isotopic Separation, Govora, 170 km west of Bucharest - no research reactors, but instead devoted to heavy water production
- National Institute for Physics and Nuclear Engineering, IFIN-HH, Mǎgurele, 5 km southwest of Bucharest - a 2 MW VVR-S research reactor
Russia
- T-15 fusion reactor at Kurchatov Institute
- VVR-M 18 MW reactor at St. Petersburg Institute of Nuclear Physics
Serbia
- Vinca Nuclear Institute, Vinča
- * RA - Reaktor A - 6.5 MW heavy water moderated and cooled research reactor
- *RB - Reaktor B - At the very beginning the RB reactor was designed and constructed as an unreflected zero power heavy water - natural uranium critical assembly. First criticality was reached in April 1958. Later, the 2% enriched metal uranium fuel and 80% enriched UO2 fuel were obtained and used in the reactor core. Modifications of the reactor control, safety and dosimetry systems converted the RB critical assembly to a flexible heavy water reflected experimental reactor with 1 W nominal power, operable up to 50 W. Several coupled fast-thermal systems were designed and constructed at RB reactor in the early 1990s, for research in fast reactors physics.
Slovenia
- Ljubljana - 250 kW TRIGA Mark II research reactor, Jožef Stefan Institute
South Africa
- Pelindaba - Pelindaba Nuclear Research Center near Pretoria
- * SAFARI-1 20MW open pool reactor
South Korea
- Aerojet General Nucleonics Model 201 Research reactor
- High-Flux Advanced Neutron Application Reactor, MAPLE class reactor
- TRIGA General Atomics Mark II Research Reactor
- TRIGA General Atomics Mark III Research Reactor
Spain
- Argos 10 kW Argonaut reactor - Polytechnic University of Catalonia, Barcelona
- CORAL-I reactor
Sweden
Name | Location | Description | Power | Operational | Current status |
R1 | KTH, Stockholm | Research | 1 MW | 1954–1970 | dismantled |
R2 | Studsvik | Research, production of isotopes for industry | 50 MW | 1960–2005 | shut down |
R2-0 | Studsvik | Research, production of isotopes for industry | 1 MW | 1960–2005 | shut down |
Ågestaverket | Farsta, Stockholm | District heating | 80 MW | 1963–1973 | shut down |
R4 | Marviken, Norrköping | Research, plutonium production | — | never completed | abandoned in 1970 |
FR-0 | Studsvik | Research, zero-power fast reactor | low | 1964–1971 | dismantled |
Switzerland
- SAPHIR - Pool reactor. First criticality: 30 April 1957. Shut down 1993. Paul Scherrer Institut
- DIORIT - HW cooled and moderated. First criticality: 15 April 1960. Shut down 1977. Paul Scherrer Institut
- Proteus - Null-power reconfigurable reactor. Shut down 2012. Paul Scherrer Institut
- Lucens - Prototype power reactor 30 MWh/6 MWe. Shut down in 1969 after accident. Site decommissioned.
- CROCUS - Null-power light water reactor. In operation. École polytechnique fédérale de Lausanne
Syria
- Miniature neutron source reactor
Taiwan
- Hsinchu - TRIGA, National Tsing Hua University
Thailand
- Thai Research Reactor 1/Modification 1 Thailand Institute of Nuclear Technology Bangkok - TRIGA Mark III
- TRIGA MPR 10, Ongkharak Nuclear Research Center
Turkey
- TR-1 Research Reactor
- TR-2 Research Reactor
- TRIGA MARK II Research Reactor
Fuel pilot plants
- TRD Fuel Pilot Plant
Ukraine
- Kiev Institute for Nuclear Research
- Sevastopol Institute of Nuclear Energy and Industry
United Kingdom
- Aldermaston - VIPER - Atomic Weapons Establishment
- Ascot - CONSORT reactor, Imperial College London, Silwood Park campus
- Billingham - TRIGA Mark I reactor, ICI Physics and Radioisotopes Dept of ICI R&D, Billingham
- Culham - JET fusion reactor
- Derby - Neptune - Rolls-Royce Marine Power Operations Ltd, Raynesway
- Dounreay
- *The Shore Test Facility at VULCAN
- *DSMP1 at VULCAN
- *DMTR
- *Dounreay Fast Reactor - Fast breeder reactor
- *Prototype Fast Reactor
- East Kilbride - Scottish Universities Research and Reactor Centre
- Harwell AERE
- *GLEEP
- *BEPO
- *LIDO
- *DIDO
- *PLUTO
- London
- *Greenwich - JASON 10 kW Argonaut class reactor
- *Stratford Marsh - Queen Mary College
- Risley - Universities Research Reactor
- Sellafield
- *PILE 1
- *PILE 2
- *WAGR
- Winfrith - Dorchester, Dorset, 9 reactors, shut down 1990
- *Dragon reactor
United States
Plutonium production reactors
- Hanford Site, Washington
- *B-Reactor - Preserved as a museum
- * - Cocooned
- * - Cocooned
- * - Cocooned
- * - Cocooned
- * - Cocooned
- * - Being cocooned
- * - Being cocooned
- *N-Reactor - Cocooned
- Savannah River Site, South Carolina
- *R-Reactor - S&M mode
- *P-Reactor - S&M mode
- *L-Reactor - S&M mode
- *K-Reactor - S&M mode
- *C-Reactor - S&M mode
Army Nuclear Power Program
- SM-1
- SM-1A
- PM-2A
- PM-1
- PM-3A
- MH-1A
- SL-1
- ML-1
United States Naval reactors
- Knolls Atomic Power Laboratory
- *Prototype S8G Reactor
- *MARF prototype reactor
- *D1G prototype
- *S3G prototype, Ballston Spa, New York
- Nuclear Power Training Unit, Charleston, South Carolina
- USS Daniel Webster
- USS Sam Rayburn
Research reactors
- Arkansas-Southwest Experimental Fast Oxide Reactor, Arkansas
- *SEFOR - Shut down
- Argonne National Laboratory, Illinois
- *ALPR; see also SL-1/ALPR - Facility was turned over to the U.S. Army, was destroyed in an accident
- *AFSR - Shut down
- *BORAX-I - intentionally exploded
- *BORAX-II - Shut down
- *BORAX-III - Shut down
- *BORAX-IV - Shut down
- *BORAX-V - Shut down
- *CP-1 - Chicago Pile 1 - Shut down,
- *CP-3 - Chicago Pile 3 - Shut down
- *CP-5 - Chicago Pile 5 - Shut down
- *EBR-I - Experimental Breeder Reactor I - Shut down
- *EBR-II - Experimental Breeder Reactor II - Shut down
- *EBWR - Experimental Boiling Water Reactor - Shut down
- *LMFBR - Liquid Metal Fast Breeder Reactor - Shut down
- *JANUS reactor - Shut down
- *JUGGERNAUT - Shut down
- *IFR - Integral Fast Reactor - Never operated
- *MTR - Shut down
- *SL-1/ALPR - Stationary Low Power Plant - Shut down
- *S1W/STR - Shut down
- *Transient Reactor Test Facility - Currently shut down, restart activities have begun.
- *ZPPR - Zero Power Physics Reactor - Standby,
- *ZPR-III - Shut down
- *ZPR-6 - Shut down in 1982
- *ZPR-7 - Shut down
- *ZPR-9 - Shut down in 1981
- Brookhaven National Laboratory, Upton, New York
- *High Flux Beam Reactor - Shut down
- *Medical Research Reactor - Shut down
- *Brookhaven Graphite Research Reactor - Shut down
- Hanford Site, Washington
- *Fast Flux Test Facility - Core drilled
- Idaho National Laboratory, Idaho
- *ARMF-I - Shut down
- *AMRF-II - Shut down
- *ATR - Operating
- *ATRC - Operating
- *CRCE - Shut down
- *CFRMF - Shut down
- *CET - Shut down
- *Experimental Test Reactor - Shut down
- *ETRC - Shut down
- *EBOR - Never operated
- *ECOR - Never operated
- *710 - Shut down
- *GCRE - Gas Cooled Reactor Experiment - shut down
- *HTRE-1 - Heat Transfer Reactor Experiment 1 - shut down
- *HTRE-2 - Heat Transfer Reactor Experiment 2 - shut down
- *HTRE-3 - Heat Transfer Reactor Experiment 3 - shut down
- *603-A - Shut down
- *HOTCE - Shut down
- *A1W-A - Shut down
- *A1W-B - Shut down
- *LOFT - Shut down
- *ML-1 - Mobil Low Power Plant - shut down
- *S5G - Shut down
- *NRAD - Operating
- *FRAN - Shut down
- *OMRE - Shut down
- *PBF - Shut down
- *RMF - Shut down
- *SUSIE - Operating
- *SPERT-I - Shut down
- *SPERT-II - Shut down
- *SPERT-III - Shut down
- *SPERT-IV - Shut down
- *SCRCE - Shut down
- *SNAPTRAN-1 - Shut down
- *SNAPTRAN-2 - Shut down
- *SNAPTRAN-3 - Shut down
- *THRITS - Shut down
- Los Alamos National Laboratory, New Mexico
- *UHTREX - Shut down
- *Omega West - Shut down
- *Clementine - Shut down
- Nevada Test Site, Nevada
- *BREN Tower
- *Demonstration Using Flattop Fission - Operated 2012-2012
- Oak Ridge National Laboratory, Tennessee
- *X-10 Graphite Reactor - Shut down, operated 1943-1963
- *Homogeneous Reactor Experiment - Shut down, operated 1952-1954
- *Homogeneous Reactor Test - Shut down, operated 1957-1961
- *Aircraft Reactor Experiment - Shut down, operated 1954-1955
- *Molten Salt Reactor Experiment - Shut down, operated 1965-1969
- *Health Physics Research Reactor - Shut down, operated 1963-1987
- *Low-Intensity Test Reactor - Shut down, operated 1950-1968
- *Bulk Shielding Reactor - Shut down, operated 1950-1987
- *Geneva Conference Reactor - Shut down, operated 1955
- *Tower Shielding Reactor-I - Shut down, operated 1954-1958
- *Tower Shielding Reactor-II - Shut down, operated 1958-1982
- *Oak Ridge Research Reactor - Shut down, operated 1958-1987
- *High Flux Isotope Reactor - Operating, started 1965
- *Pool Critical Assembly - Shut down, operated 1958 - 1987
- *Experimental Gas Cooled Reactor - Constructed, but never operated
- Savannah River Site, South Carolina
- *HWCTR - Heavy Water Components Test Reactor - Partial decommissioning
- Santa Susana Field Laboratory, Simi Hills California
- *Sodium Reactor Experiment
- *SNAP-10A
Civilian research and test reactors licensed to operate
Under decommission orders or license amendments
- General Atomics, San Diego, California
- National Aeronautics and Space Administration, Sandusky, Ohio
- University of Illinois at Urbana–Champaign, Urbana, Illinois
- University of Michigan, Ann Arbor, Michigan
With possession-only licenses
- General Electric Company, Sunol, California
- Nuclear Ship Savannah, James River Reserve Fleet, Virginia
- University at Buffalo
- U.S. Veterans Administration, Omaha, NE
- Worcester Polytechnic Institute, Worcester, MA
Uruguay
- URR reactor - A small pool-type research reactor placed in Centro de Investigaciones Nucleares. In operation since the early 1970s up until 1997 when it was dismantled and returned to United States due to a 1997 law against use of nuclear energy in Uruguay.
Uzbekistan
- Ulugbek, Tashkent- WWR-SM tank reactor
Venezuela
- RV-1 nuclear reactor - 3MW pool-type reactor at Venezuelan Institute for Scientific Research
Vietnam
- Da Lat - TRIGA Mark II