Advanced Test Reactor

E99195

materials testing reactor research nuclear reactor test reactor

The Advanced Test Reactor is a high-flux research nuclear reactor used primarily for materials testing and irradiation experiments, located at the Idaho National Laboratory in the United States.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

AI illustration

All labels observed (3)

Label	Occurrences
Advanced Test Reactor canonical	2
Advanced Test Reactor Critical Facility	1
Advanced Test Reactor National Scientific User Facility	1

How this entity was disambiguated

This entity first appeared as the object of triple T854082 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Advanced Test Reactor
Context triple: [Idaho National Engineering Laboratory, hasFacility, Advanced Test Reactor]

A. TRIGA research reactor
The TRIGA research reactor is a small, inherently safe nuclear reactor design widely used in universities and research institutions for education, training, and scientific experiments.
B. K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
C. X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
D. N Reactor
N Reactor was a dual-purpose plutonium production and power-generating nuclear reactor at the Hanford Site in Washington, notable for its graphite-moderated, water-cooled design and role in the U.S. Cold War weapons program.
E. D Reactor
D Reactor was one of the early plutonium production reactors at the Hanford Site in Washington, built during the Manhattan Project to support the U.S. nuclear weapons program.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Advanced Test Reactor
Target entity description: The Advanced Test Reactor is a high-flux research nuclear reactor used primarily for materials testing and irradiation experiments, located at the Idaho National Laboratory in the United States.

A. TRIGA research reactor
The TRIGA research reactor is a small, inherently safe nuclear reactor design widely used in universities and research institutions for education, training, and scientific experiments.
B. K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
C. X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
D. N Reactor
N Reactor was a dual-purpose plutonium production and power-generating nuclear reactor at the Hanford Site in Washington, notable for its graphite-moderated, water-cooled design and role in the U.S. Cold War weapons program.
E. D Reactor
D Reactor was one of the early plutonium production reactors at the Hanford Site in Washington, built during the Manhattan Project to support the U.S. nuclear weapons program.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	materials testing reactor ⓘ research nuclear reactor ⓘ test reactor ⓘ
abbreviation	ATR ⓘ
commissioningDate	1967 ⓘ
constructionStartDate	1961 ⓘ
coolant	light water ⓘ
coolantPressure	approximately 2.8 MPa ⓘ
coreShape	four-leaf clover ⓘ serpentine ⓘ
country	United States ⓘ linked to: United States of America
designedBy	Idaho National Laboratory ⓘ linked to: Idaho National Engineering Laboratory
firstCriticalityDate	1967 ⓘ
fuelType	highly enriched uranium ⓘ
hasFacility	Advanced Test Reactor Critical Facility ⓘ linked to: Advanced Test Reactor
hasNeutronSpectrum	epithermal ⓘ fast ⓘ thermal ⓘ
locatedIn	Idaho Falls, Idaho ⓘ linked to: Idaho Falls, Idaho area
location	Idaho National Laboratory ⓘ linked to: Idaho National Engineering Laboratory
managedBy	Battelle Energy Alliance ⓘ
moderator	light water ⓘ
neutronFlux	high-flux ⓘ
notableFeature	multiple independent flux traps and irradiation positions ⓘ very high neutron flux compared to power reactors ⓘ
operator	Idaho National Laboratory ⓘ linked to: Idaho National Engineering Laboratory
owner	United States Department of Energy ⓘ linked to: U.S. Department of Energy
partOf	United States Department of Energy nuclear research infrastructure ⓘ
primaryUse	irradiation experiments ⓘ materials testing ⓘ neutron irradiation of fuels and materials ⓘ
produces	medical isotopes ⓘ radioisotopes ⓘ
reactorType	light water reactor ⓘ pressurized water reactor ⓘ
regulatoryBody	United States Nuclear Regulatory Commission ⓘ linked to: U.S. Nuclear Regulatory Commission
researchField	nuclear materials ⓘ radiation effects on materials ⓘ reactor fuels ⓘ
safetyFeature	multiple redundant shutdown systems ⓘ pressurized water containment systems ⓘ
status	operational ⓘ
supportsProgram	isotope production ⓘ naval nuclear propulsion materials testing ⓘ space nuclear power materials testing ⓘ
thermalPower	250 MWth ⓘ
usedBy	government researchers ⓘ industry researchers ⓘ university researchers ⓘ

How these facts were elicited

Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

Idaho National Engineering Laboratory → hasFacility → Advanced Test Reactor ⓘ

Advanced Test Reactor → hasFacility → Advanced Test Reactor Critical Facility ⓘ

linked to: Advanced Test Reactor

ATR → fullName → Advanced Test Reactor ⓘ

ATR → hasOrganization → Advanced Test Reactor National Scientific User Facility ⓘ