R Reactor
E101611
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| R Reactor canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T842137 — 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: R Reactor Context triple: [Savannah River Site, formerFacility, R Reactor]
-
A.
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.
-
B.
H Reactor
H Reactor was one of the plutonium-producing nuclear reactors at the Hanford Site in Washington, built during the Cold War as part of the U.S. nuclear weapons program.
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C.
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.
-
D.
B Reactor
B Reactor is the world’s first full-scale plutonium production reactor, built during the Manhattan Project at the Hanford Site in Washington State.
-
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: R Reactor Target entity description: 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.
-
A.
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.
-
B.
H Reactor
H Reactor was one of the plutonium-producing nuclear reactors at the Hanford Site in Washington, built during the Cold War as part of the U.S. nuclear weapons program.
-
C.
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.
-
D.
B Reactor
B Reactor is the world’s first full-scale plutonium production reactor, built during the Manhattan Project at the Hanford Site in Washington State.
-
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 (46)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear reactor
ⓘ
plutonium production reactor ⓘ production reactor ⓘ tritium production reactor ⓘ |
| associatedWith | Savannah River National Laboratory ⓘ |
| coLocatedWith |
C Reactor
ⓘ
K Reactor ⓘ L Reactor ⓘ P Reactor ⓘ |
| constructionStart | early 1950s ⓘ |
| coolant | heavy water ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| currentUse | non-operational, decommissioned facility ⓘ |
| decommissioningStart | 1960s ⓘ |
| designedBy | DuPont ⓘ |
| endOfOperation | 1964 ⓘ |
| environmentalConcern | radioactive contamination risk ⓘ |
| firstCriticality | 1953 ⓘ |
| fuelType | natural uranium ⓘ |
| historicalPeriod | Cold War ⓘ |
| legacy | Cold War nuclear materials production facility ⓘ |
| locatedIn | South Carolina ⓘ |
| locatedNear | Aiken, South Carolina ⓘ |
| location | Savannah River Site ⓘ |
| moderator | heavy water ⓘ |
| notableFor | production of plutonium and tritium during the Cold War ⓘ |
| operator |
U.S. Atomic Energy Commission
ⓘ
linked to:
United States Atomic Energy Commission
U.S. Department of Energy ⓘ |
| ownership | U.S. Department of Energy ⓘ |
| partOf |
Cold War nuclear weapons infrastructure
ⓘ
Savannah River Site production reactor complex ⓘ U.S. nuclear weapons program ⓘ |
| precededBy | Hanford production reactors ⓘ |
| primaryProduct |
plutonium-239
ⓘ
tritium ⓘ |
| purpose |
production of tritium for nuclear weapons
ⓘ
production of weapons-grade plutonium ⓘ |
| reactorType | heavy-water moderated reactor ⓘ |
| regulatoryBody | U.S. Department of Energy ⓘ |
| safetyFeature | water-cooled design ⓘ |
| site | Savannah River Site ⓘ |
| startOfOperation | 1953 ⓘ |
| status |
decommissioned
ⓘ
shutdown ⓘ |
| usedFor |
production of special nuclear materials
ⓘ
support of U.S. nuclear weapons stockpile ⓘ |
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: R Reactor Description of subject: 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.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.