P Reactor
E100463
nuclear reactor
plutonium production reactor
production reactor
research and defense facility
tritium production 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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| P Reactor canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T842136 — 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: P Reactor Context triple: [Savannah River Site, formerFacility, P Reactor]
-
A.
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.
-
B.
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.
-
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.
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.
-
E.
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.
- 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: P Reactor Target entity description: 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.
-
A.
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.
-
B.
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.
-
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.
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.
-
E.
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.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear reactor
ⓘ
plutonium production reactor ⓘ production reactor ⓘ research and defense facility ⓘ tritium production reactor ⓘ |
| associatedWith |
Cold War plutonium production
ⓘ
Cold War tritium production ⓘ |
| builtFor | U.S. national defense ⓘ |
| commissioned | 1954 ⓘ |
| constructionStart | early 1950s ⓘ |
| coolant | heavy water ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| decommissioningStatus | under decommissioning and deactivation ⓘ |
| designedFor | high neutron flux for isotope production ⓘ |
| era | Cold War ⓘ |
| fuelType | natural uranium ⓘ |
| historicalSignificance | part of early U.S. production reactors for nuclear weapons ⓘ |
| locatedIn |
Savannah River Site
ⓘ
South Carolina ⓘ United States of America ⓘ
surface form:
United States
|
| locatedOn | Savannah River ⓘ |
| managedBy |
United States Atomic Energy Commission
ⓘ
surface form:
U.S. Atomic Energy Commission
|
| moderator | heavy water ⓘ |
| neighboringFacilities |
C Reactor
ⓘ
D Reactor ⓘ K Reactor ⓘ L Reactor ⓘ R Reactor ⓘ |
| operatedBy | U.S. Department of Energy ⓘ |
| ownedBy | U.S. Department of Energy ⓘ |
| partOf |
Savannah River Site
ⓘ
surface form:
Savannah River Site reactor complex
|
| partOfProgram |
United States nuclear weapons complex
ⓘ
surface form:
U.S. nuclear weapons complex
|
| permanentShutdown | 1991 ⓘ |
| primaryProduct |
tritium for nuclear weapons
ⓘ
weapons-grade plutonium ⓘ |
| purpose |
plutonium production for nuclear weapons
ⓘ
support U.S. nuclear weapons program ⓘ tritium production for nuclear weapons ⓘ |
| reactorType | pressurized heavy water reactor ⓘ |
| region |
Aiken County, South Carolina
ⓘ
Barnwell County, South Carolina ⓘ |
| regulatoryOversight | U.S. Department of Energy ⓘ |
| safetyStatus | permanently shut down ⓘ |
| shutdown | 1991 ⓘ |
| site |
Savannah River Site
ⓘ
surface form:
Savannah River Site 100-P Area
|
| startOfOperation | 1954 ⓘ |
| successorManagingAgency | U.S. Department of Energy ⓘ |
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: P Reactor Description of subject: 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.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.