D Reactor
E6773
Manhattan Project facility
graphite-moderated nuclear reactor
military nuclear facility
plutonium production 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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| D Reactor canonical | 6 |
| DR Reactor | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T63447 — 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: D Reactor Context triple: [Hanford Site, reactor, D Reactor]
-
A.
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.
-
B.
DART Victory Station
DART Victory Station is a Dallas Area Rapid Transit rail station serving the Victory Park area, including major venues like the American Airlines Center.
-
C.
Hanford Site, Washington
Hanford Site, Washington is a large decommissioned nuclear production complex along the Columbia River that was central to U.S. plutonium production during and after World War II and is now one of the nation’s most challenging environmental cleanup sites.
-
D.
Ruckelshaus
Ruckelshaus is the surname of William D. Ruckelshaus, a prominent American lawyer and public official best known as the first head of the U.S. Environmental Protection Agency and a key figure in the Watergate-era "Saturday Night Massacre."
-
E.
Bardeen
Bardeen is a surname most notably associated with John Bardeen, the American physicist who won the Nobel Prize in Physics twice for his work on the transistor and superconductivity.
- 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: D Reactor Target entity description: 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.
-
A.
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.
-
B.
DART Victory Station
DART Victory Station is a Dallas Area Rapid Transit rail station serving the Victory Park area, including major venues like the American Airlines Center.
-
C.
Hanford Site, Washington
Hanford Site, Washington is a large decommissioned nuclear production complex along the Columbia River that was central to U.S. plutonium production during and after World War II and is now one of the nation’s most challenging environmental cleanup sites.
-
D.
Ruckelshaus
Ruckelshaus is the surname of William D. Ruckelshaus, a prominent American lawyer and public official best known as the first head of the U.S. Environmental Protection Agency and a key figure in the Watergate-era "Saturday Night Massacre."
-
E.
Bardeen
Bardeen is a surname most notably associated with John Bardeen, the American physicist who won the Nobel Prize in Physics twice for his work on the transistor and superconductivity.
- F. None of above. chosen
Statements (37)
| Predicate | Object |
|---|---|
| instanceOf |
Manhattan Project facility
ⓘ
graphite-moderated nuclear reactor ⓘ military nuclear facility ⓘ plutonium production reactor ⓘ |
| associatedWith |
plutonium production for early U.S. nuclear weapons
ⓘ
plutonium production for the Trinity test ⓘ |
| builtFor | U.S. nuclear weapons program ⓘ |
| commissioned | 1944 ⓘ |
| completionDate | 1944 ⓘ |
| constructionStartDate | 1943 ⓘ |
| coolingMethod | once-through water cooling ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| currentUse | historic industrial facility ⓘ |
| designedBy | DuPont ⓘ |
| firstCriticalityDate | 1944 ⓘ |
| followedBy | F Reactor ⓘ |
| fuelType | natural uranium ⓘ |
| historicalPeriod |
Cold War
ⓘ
World War II ⓘ |
| locatedIn |
Benton County, Washington
ⓘ
Hanford Site, Washington ⓘ
surface form:
Hanford Site
Washington ⓘ
surface form:
Washington State
|
| moderator | graphite ⓘ |
| near | Columbia River ⓘ |
| operator |
DuPont
ⓘ
U.S. Army Corps of Engineers ⓘ |
| ownedBy |
United States government
ⓘ
surface form:
U.S. federal government
|
| partOf |
Hanford Site, Washington
ⓘ
surface form:
Hanford Engineer Works
Hanford Site, Washington ⓘ
surface form:
Hanford Nuclear Reservation
Manhattan Project ⓘ |
| partOfSeries | Hanford production reactors ⓘ |
| precededBy | B Reactor ⓘ |
| purpose | plutonium production for nuclear weapons ⓘ |
| safetyMeasures | remote desert location to limit population exposure ⓘ |
| shutdownDate | 1967 ⓘ |
| siteType | restricted access nuclear site ⓘ |
| status | decommissioned ⓘ |
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: D Reactor Description of subject: 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.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Hanford Site
subject surface form:
Hanford Site
this entity surface form:
DR Reactor