Oak Ridge Gaseous Diffusion Plant

E168165

Manhattan Project facility industrial facility uranium enrichment plant

The Oak Ridge Gaseous Diffusion Plant was a major U.S. uranium enrichment facility in Oak Ridge, Tennessee, built during the Manhattan Project and later used for Cold War nuclear fuel production.

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All labels observed (8)

Label	Occurrences
Oak Ridge Gaseous Diffusion Plant canonical	3
K-25 Site	2
K-25 gaseous diffusion plant	2
Oak Ridge gaseous diffusion complex	2
K-25 Plant	1
K-25 plant at Oak Ridge	1
National Historic Chemical Landmark (as K-25)	1
Oak Ridge gaseous diffusion plants	1

How this entity was disambiguated

This entity first appeared as the object of triple T1363756 — 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: Oak Ridge Gaseous Diffusion Plant
Context triple: [East Tennessee Technology Park, formerlyKnownAs, Oak Ridge Gaseous Diffusion Plant]

A. Paducah Gaseous Diffusion Plant
The Paducah Gaseous Diffusion Plant is a former U.S. Department of Energy uranium enrichment facility in western Kentucky that played a major role in producing enriched uranium for nuclear power and defense.
B. Portsmouth Gaseous Diffusion Plant (historical)
The Portsmouth Gaseous Diffusion Plant was a major U.S. uranium enrichment facility in Ohio that played a key role in producing enriched uranium for nuclear weapons and commercial nuclear power during the Cold War.
C. Y-12 National Security Complex
The Y-12 National Security Complex is a U.S. Department of Energy facility central to nuclear weapons production, uranium processing, and national security operations.
D. Oak Ridge Reservation
Oak Ridge Reservation is a large U.S. Department of Energy site in Oak Ridge, Tennessee, historically central to the Manhattan Project and now a major center for nuclear research, environmental management, and national security work.
E. Savannah River Site
Savannah River Site is a U.S. Department of Energy nuclear reservation in South Carolina historically used for producing materials for nuclear weapons and now focused on environmental cleanup and nuclear materials management.
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: Oak Ridge Gaseous Diffusion Plant
Target entity description: The Oak Ridge Gaseous Diffusion Plant was a major U.S. uranium enrichment facility in Oak Ridge, Tennessee, built during the Manhattan Project and later used for Cold War nuclear fuel production.

A. Paducah Gaseous Diffusion Plant
The Paducah Gaseous Diffusion Plant is a former U.S. Department of Energy uranium enrichment facility in western Kentucky that played a major role in producing enriched uranium for nuclear power and defense.
B. Portsmouth Gaseous Diffusion Plant (historical)
The Portsmouth Gaseous Diffusion Plant was a major U.S. uranium enrichment facility in Ohio that played a key role in producing enriched uranium for nuclear weapons and commercial nuclear power during the Cold War.
C. Y-12 National Security Complex
The Y-12 National Security Complex is a U.S. Department of Energy facility central to nuclear weapons production, uranium processing, and national security operations.
D. Oak Ridge Reservation
Oak Ridge Reservation is a large U.S. Department of Energy site in Oak Ridge, Tennessee, historically central to the Manhattan Project and now a major center for nuclear research, environmental management, and national security work.
E. Savannah River Site
Savannah River Site is a U.S. Department of Energy nuclear reservation in South Carolina historically used for producing materials for nuclear weapons and now focused on environmental cleanup and nuclear materials management.
F. None of above. chosen

Statements (46)

Predicate	Object
instanceOf	Manhattan Project facility ⓘ industrial facility ⓘ uranium enrichment plant ⓘ
alsoKnownAs	Oak Ridge Gaseous Diffusion Plant ⓘ surface form: K-25 Plant Oak Ridge Gaseous Diffusion Plant ⓘ surface form: K-25 Site
associatedWith	Little Boy ⓘ surface form: Little Boy (Hiroshima uranium bomb) U.S. nuclear weapons complex ⓘ
builtDuring	World War II ⓘ
city	Oak Ridge, Tennessee ⓘ surface form: Oak Ridge
constructionStart	1943 ⓘ
continent	North America ⓘ
country	United States of America ⓘ surface form: United States
demolitionCompleted	2013 ⓘ
environmentalIssue	chemical contamination ⓘ radiological contamination ⓘ
eraOfOperation	Cold War ⓘ World War II ⓘ
heritageDesignation	Oak Ridge Gaseous Diffusion Plant self-linksurface differs ⓘ surface form: National Historic Chemical Landmark (as K-25)
locatedIn	Oak Ridge, Tennessee ⓘ Tennessee ⓘ United States of America ⓘ surface form: United States
locatedNear	Clinch River ⓘ
managedBy	Union Carbide Corporation ⓘ surface form: Union Carbide (historical operator under contract)
operator	U.S. Army Corps of Engineers ⓘ surface form: U.S. Army Corps of Engineers (during World War II) United States Atomic Energy Commission ⓘ surface form: U.S. Atomic Energy Commission U.S. Department of Energy ⓘ
ownedBy	United States government ⓘ surface form: U.S. government
partOf	Manhattan Project ⓘ Oak Ridge Reservation ⓘ U.S. nuclear fuel cycle infrastructure ⓘ
purpose	enrichment of uranium-235 ⓘ production of enriched uranium for nuclear reactors ⓘ production of highly enriched uranium for nuclear weapons ⓘ
relatedTo	Paducah Gaseous Diffusion Plant ⓘ Portsmouth Gaseous Diffusion Plant (historical) ⓘ surface form: Portsmouth Gaseous Diffusion Plant
safetyConcern	worker exposure to uranium and chemicals ⓘ
significance	one of the largest buildings in the world at the time of construction ⓘ
state	Tennessee ⓘ
status	decommissioned ⓘ demolished ⓘ
subjectOf	environmental remediation projects ⓘ
technologyUsed	gaseous diffusion ⓘ
usedBy	Department of Defense ⓘ surface form: U.S. Department of Defense U.S. civilian nuclear power sector (fuel supply) ⓘ
usedFor	Cold War nuclear fuel production ⓘ production of uranium for the first atomic bombs ⓘ

How these facts were elicited

Referenced by (13)

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

East Tennessee Technology Park → formerlyKnownAs → Oak Ridge Gaseous Diffusion Plant ⓘ

K-25 Project → partOf → Oak Ridge Gaseous Diffusion Plant ⓘ

this entity surface form: Oak Ridge gaseous diffusion complex

K-25 Project → successor → Oak Ridge Gaseous Diffusion Plant ⓘ

Paducah Gaseous Diffusion Plant → sisterFacility → Oak Ridge Gaseous Diffusion Plant ⓘ

S-50 thermal diffusion plant → adjacentTo → Oak Ridge Gaseous Diffusion Plant ⓘ

this entity surface form: K-25 gaseous diffusion plant

Heritage Center → formerName → Oak Ridge Gaseous Diffusion Plant ⓘ

this entity surface form: K-25 Site

Oak Ridge Gaseous Diffusion Plant → alsoKnownAs → Oak Ridge Gaseous Diffusion Plant ⓘ

this entity surface form: K-25 Plant

Oak Ridge Gaseous Diffusion Plant → alsoKnownAs → Oak Ridge Gaseous Diffusion Plant ⓘ

this entity surface form: K-25 Site

Oak Ridge Gaseous Diffusion Plant → heritageDesignation → Oak Ridge Gaseous Diffusion Plant self-linksurface differs ⓘ

this entity surface form: National Historic Chemical Landmark (as K-25)

Kellex Corporation → notableWork → Oak Ridge Gaseous Diffusion Plant ⓘ

this entity surface form: K-25 gaseous diffusion plant

Kellex Corporation → associatedWith → Oak Ridge Gaseous Diffusion Plant ⓘ

this entity surface form: K-25 plant at Oak Ridge

K-27 plant → partOf → Oak Ridge Gaseous Diffusion Plant ⓘ