K-East Reactor
E8827
K-East Reactor was one of the plutonium production reactors at the Hanford Site in Washington State, built during the Cold War to support the U.S. nuclear weapons program.
All labels observed (1)
| Label | Occurrences |
|---|---|
| K-East Reactor canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T63452 — 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: K-East Reactor Context triple: [Hanford Site, reactor, K-East Reactor]
-
A.
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.
-
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.
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.
-
D.
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.
-
E.
Izumi
Izumi is a city located in Osaka Prefecture, Japan, known as a residential and commercial hub in the Kansai region.
- 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: K-East Reactor Target entity description: K-East Reactor was one of the plutonium production reactors at the Hanford Site in Washington State, built during the Cold War to support the U.S. nuclear weapons program.
-
A.
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.
-
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.
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.
-
D.
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.
-
E.
Izumi
Izumi is a city located in Osaka Prefecture, Japan, known as a residential and commercial hub in the Kansai region.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
Hanford Site reactor
ⓘ
nuclear reactor ⓘ plutonium production reactor ⓘ |
| adjacentTo | K-West Reactor ⓘ |
| associatedWith |
Hanford Federal Facility Agreement and Consent Order
ⓘ
surface form:
Hanford cleanup program
environmental remediation at Hanford Site ⓘ |
| coolingMethod | water-cooled ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designedFor | weapons-grade plutonium production ⓘ |
| era | Cold War ⓘ |
| fuelType | natural uranium ⓘ |
| historicalSignificance | part of U.S. Cold War nuclear infrastructure ⓘ |
| locatedIn |
Columbia River
ⓘ
surface form:
Columbia River basin
Hanford Site, Washington ⓘ
surface form:
Hanford Site
Washington ⓘ
surface form:
Washington State
|
| namedAfter |
Hanford production reactors
ⓘ
surface form:
K Area at Hanford
|
| neutronModerator | graphite ⓘ |
| operator |
United States Atomic Energy Commission
ⓘ
surface form:
U.S. Atomic Energy Commission
|
| owner |
United States Atomic Energy Commission
ⓘ
surface form:
U.S. Atomic Energy Commission
|
| partOf |
Hanford Site, Washington
ⓘ
surface form:
Hanford plutonium production complex
U.S. nuclear weapons program ⓘ |
| purpose |
plutonium production
ⓘ
support U.S. nuclear weapons program ⓘ |
| reactorType |
graphite-moderated reactor
ⓘ
production reactor ⓘ |
| regulatoryBody | U.S. Department of Energy ⓘ |
| safetyConcern |
radioactive contamination
ⓘ
spent fuel basin leaks ⓘ |
| siteUse | federal nuclear reservation ⓘ |
| successorOperator | 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: K-East Reactor Description of subject: K-East Reactor was one of the plutonium production reactors at the Hanford Site in Washington State, built during the Cold War to support the U.S. nuclear weapons program.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Hanford Site