Rocky Flats Plant (historical)
E128187
Rocky Flats Plant (historical) was a major U.S. nuclear weapons production facility near Denver, Colorado, primarily responsible for manufacturing plutonium triggers for nuclear warheads and later notorious for environmental contamination and safety violations.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Rocky Flats Environmental Technology Site (cleanup successor) | 1 |
| Rocky Flats Plant | 1 |
| Rocky Flats Plant (historical) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1114541 — 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: Rocky Flats Plant (historical) Context triple: [United States nuclear weapons complex, includesFacility, Rocky Flats Plant (historical)]
-
A.
Pantex Plant
Pantex Plant is a U.S. nuclear weapons facility in Texas responsible for the assembly, disassembly, and maintenance of the nation’s nuclear warheads.
-
B.
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.
-
C.
Nevada National Security Site
The Nevada National Security Site is a U.S. Department of Energy reservation in southern Nevada historically used for nuclear weapons testing and now for national security research, training, and hazardous materials experiments.
-
D.
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.
-
E.
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.
- 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: Rocky Flats Plant (historical) Target entity description: Rocky Flats Plant (historical) was a major U.S. nuclear weapons production facility near Denver, Colorado, primarily responsible for manufacturing plutonium triggers for nuclear warheads and later notorious for environmental contamination and safety violations.
-
A.
Pantex Plant
Pantex Plant is a U.S. nuclear weapons facility in Texas responsible for the assembly, disassembly, and maintenance of the nation’s nuclear warheads.
-
B.
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.
-
C.
Nevada National Security Site
The Nevada National Security Site is a U.S. Department of Energy reservation in southern Nevada historically used for nuclear weapons testing and now for national security research, training, and hazardous materials experiments.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
former industrial facility
ⓘ
nuclear weapons production facility ⓘ |
| addedToSuperfund | 1989 ⓘ |
| cleanupCompletionDate | 2005 ⓘ |
| cleanupCost | approximately $7 billion ⓘ |
| cleanupStartDate | 1990s ⓘ |
| closureDate | 2005 ⓘ |
| constructionStartDate | 1951 ⓘ |
| contaminant |
americium
ⓘ
hazardous waste ⓘ plutonium ⓘ uranium ⓘ volatile organic compounds ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| endOfWeaponsProduction | 1989 ⓘ |
| environmentalImpact |
airborne radioactive releases
ⓘ
groundwater contamination ⓘ soil contamination ⓘ |
| era | Cold War ⓘ |
| historicalPeriod | 1950s–1990s ⓘ |
| inception | 1952 ⓘ |
| legalStatus | Superfund site ⓘ |
| locatedIn | Jefferson County, Colorado ⓘ |
| locatedNear |
Boulder, Colorado
ⓘ
Denver, Colorado ⓘ |
| managedBy | U.S. Fish and Wildlife Service ⓘ |
| nearbyCity |
Arvada
ⓘ
surface form:
Arvada, Colorado
Westminster, Colorado ⓘ |
| notableFor |
FBI and EPA raid in 1989
ⓘ
environmental contamination ⓘ industrial safety violations ⓘ radiological pollution ⓘ |
| operatedBy |
United States Atomic Energy Commission
ⓘ
surface form:
Atomic Energy Commission
Dow Chemical Company ⓘ EG&G ⓘ Kaiser-Hill Company ⓘ Rockwell International ⓘ U.S. Department of Energy ⓘ |
| ownedBy |
United States government
ⓘ
surface form:
U.S. federal government
|
| partOf | U.S. nuclear weapons complex ⓘ |
| primaryFunction |
manufacture of plutonium pits
ⓘ
production of nuclear weapons components ⓘ |
| product |
beryllium components
ⓘ
plutonium triggers for nuclear warheads ⓘ uranium components ⓘ |
| redevelopedAs | Rocky Flats National Wildlife Refuge ⓘ |
| regulator |
Colorado Department of Public Health and Environment
ⓘ
United States Environmental Protection Agency ⓘ
surface form:
Environmental Protection Agency
|
| safetyIncident | major plutonium fires in 1957 and 1969 ⓘ |
| startOfOperations | 1953 ⓘ |
| subjectOf |
FBI Operation Desert Glow
ⓘ
environmental health studies ⓘ nuclear weapons policy debates ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Rocky Flats Plant (historical) Description of subject: Rocky Flats Plant (historical) was a major U.S. nuclear weapons production facility near Denver, Colorado, primarily responsible for manufacturing plutonium triggers for nuclear warheads and later notorious for environmental contamination and safety violations.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Rocky Flats Environmental Technology Site (cleanup successor)
this entity surface form:
Rocky Flats Plant