C Reactor
E104877
C Reactor is a decommissioned nuclear production reactor at the Savannah River Site in South Carolina that was used primarily for producing materials for nuclear weapons during the Cold War.
All labels observed (1)
| Label | Occurrences |
|---|---|
| C Reactor canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T842140 — 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: C Reactor Context triple: [Savannah River Site, formerFacility, C Reactor]
-
A.
C Reactor
C Reactor is one of the early plutonium production reactors built and operated at the Hanford Site in Washington as part of the U.S. Manhattan Project and Cold War nuclear weapons program.
-
B.
L Reactor
L Reactor was a heavy water–moderated nuclear production reactor at the Savannah River Site in South Carolina, historically used to produce materials such as plutonium and tritium for the U.S. nuclear weapons program.
-
C.
F Reactor
F 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.
-
D.
P Reactor
P Reactor was a plutonium and tritium production nuclear reactor at the U.S. Department of Energy’s Savannah River Site in South Carolina, built during the Cold War to support the nation’s nuclear weapons program.
-
E.
R Reactor
R Reactor was one of the plutonium and tritium production nuclear reactors that operated at the U.S. Department of Energy’s Savannah River Site during the Cold War.
- 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: C Reactor Target entity description: C Reactor is a decommissioned nuclear production reactor at the Savannah River Site in South Carolina that was used primarily for producing materials for nuclear weapons during the Cold War.
-
A.
C Reactor
C Reactor is one of the early plutonium production reactors built and operated at the Hanford Site in Washington as part of the U.S. Manhattan Project and Cold War nuclear weapons program.
-
B.
L Reactor
L Reactor was a heavy water–moderated nuclear production reactor at the Savannah River Site in South Carolina, historically used to produce materials such as plutonium and tritium for the U.S. nuclear weapons program.
-
C.
F Reactor
F 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.
-
D.
P Reactor
P Reactor was a plutonium and tritium production nuclear reactor at the U.S. Department of Energy’s Savannah River Site in South Carolina, built during the Cold War to support the nation’s nuclear weapons program.
-
E.
R Reactor
R Reactor was one of the plutonium and tritium production nuclear reactors that operated at the U.S. Department of Energy’s Savannah River Site during the Cold War.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
decommissioned nuclear reactor
ⓘ
nuclear production reactor ⓘ plutonium production reactor ⓘ |
| associatedWithProgram |
United States nuclear weapons complex
ⓘ
surface form:
United States nuclear weapons program
|
| coolant | heavy water ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| environmentalStatus | under decommissioning and cleanup oversight ⓘ |
| fuelType | natural uranium ⓘ |
| gridConnection | no commercial electricity production ⓘ |
| historicalPeriod | Cold War nuclear weapons program ⓘ |
| locatedIn |
Savannah River Site
ⓘ
South Carolina ⓘ United States of America ⓘ
surface form:
United States
|
| locatedNear | Savannah River ⓘ |
| managedBy | U.S. Department of Energy ⓘ |
| moderator | heavy water ⓘ |
| owner |
United States government
ⓘ
surface form:
U.S. government
|
| partOf |
Savannah River Site
ⓘ
surface form:
Savannah River Site reactor complex
U.S. Cold War infrastructure ⓘ |
| primaryUse | production of materials for nuclear weapons ⓘ |
| purpose |
production of tritium
ⓘ
production of weapons-grade plutonium ⓘ |
| reactorType | heavy-water moderated reactor ⓘ |
| region |
Aiken County, South Carolina
ⓘ
Barnwell County, South Carolina ⓘ |
| regulatoryAuthority |
Office of Environmental Management
ⓘ
surface form:
U.S. Department of Energy Office of Environmental Management
|
| safetyFunction | production reactor, not power reactor ⓘ |
| siteOperator | U.S. Department of Energy ⓘ |
| status | decommissioned ⓘ |
| usedDuring | Cold War ⓘ |
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: C Reactor Description of subject: C Reactor is a decommissioned nuclear production reactor at the Savannah River Site in South Carolina that was used primarily for producing materials for nuclear weapons during the Cold War.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.