Hanford production reactors

E44495

dual-purpose reactor graphite-moderated reactor nuclear reactor series plutonium production reactor plutonium production reactor complex

The Hanford production reactors were a series of plutonium-producing nuclear reactors built during and after World War II at the Hanford Site in Washington State as part of the U.S. nuclear weapons program.

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All labels observed (7)

Label	Occurrences
Hanford production reactors canonical	3
B Reactor, Hanford	1
Hanford B Reactor	1
Hanford Engineer Works plutonium production reactors	1
Hanford production reactor complex	1
Hanford single-pass production reactors	1
K Area at Hanford	1

How this entity was disambiguated

This entity first appeared as the object of triple T338180 — 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: Hanford production reactors
Context triple: [D Reactor, partOfSeries, Hanford production reactors]

A. K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
B. 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.
C. X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
D. K-25 Project
The K-25 Project was a World War II–era Manhattan Project effort to build and operate a massive gaseous diffusion plant for uranium enrichment in Oak Ridge, Tennessee.
E. Chicago Pile-1
Chicago Pile-1 was the world’s first artificial nuclear reactor, achieving the first controlled, self-sustaining nuclear chain reaction in 1942 under the leadership of Enrico Fermi.
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: Hanford production reactors
Target entity description: The Hanford production reactors were a series of plutonium-producing nuclear reactors built during and after World War II at the Hanford Site in Washington State as part of the U.S. nuclear weapons program.

A. K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
B. 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.
C. X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
D. K-25 Project
The K-25 Project was a World War II–era Manhattan Project effort to build and operate a massive gaseous diffusion plant for uranium enrichment in Oak Ridge, Tennessee.
E. Chicago Pile-1
Chicago Pile-1 was the world’s first artificial nuclear reactor, achieving the first controlled, self-sustaining nuclear chain reaction in 1942 under the leadership of Enrico Fermi.
F. None of above. chosen

Statements (55)

Predicate	Object
instanceOf	dual-purpose reactor ⓘ graphite-moderated reactor ⓘ nuclear reactor series ⓘ plutonium production reactor ⓘ plutonium production reactor ⓘ plutonium production reactor ⓘ plutonium production reactor ⓘ plutonium production reactor ⓘ plutonium production reactor ⓘ plutonium production reactor ⓘ plutonium production reactor ⓘ plutonium production reactor complex ⓘ
associatedWith	radioactive contamination at Hanford Site ⓘ
coolant	pressurized water ⓘ water-cooled ⓘ
country	United States ⓘ linked to: United States of America United States ⓘ linked to: United States of America
designedBy	DuPont ⓘ
era	Cold War ⓘ World War II ⓘ
firstCriticality	1944 ⓘ 1944 ⓘ
fuelType	natural uranium ⓘ
hasPart	B Reactor ⓘ C Reactor ⓘ D Reactor ⓘ DR Reactor ⓘ F Reactor ⓘ H Reactor ⓘ K-East Reactor ⓘ K-West Reactor ⓘ N Reactor ⓘ
locatedIn	Benton County, Washington ⓘ Hanford Site ⓘ linked to: Hanford Site, Washington Hanford Site ⓘ linked to: Hanford Site, Washington Washington State ⓘ linked to: Washington
locatedOn	Columbia River ⓘ
notableFor	world's first full-scale plutonium production reactor ⓘ
numberOfReactors	9 ⓘ
operator	DuPont ⓘ General Electric ⓘ U.S. Army Corps of Engineers ⓘ
ownedBy	United States government ⓘ
partOf	Hanford Site ⓘ linked to: Hanford Site, Washington
producedPlutoniumFor	Fat Man nuclear bomb ⓘ linked to: Fat Man Trinity test ⓘ linked to: Trinity test device
program	Manhattan Project ⓘ U.S. nuclear weapons program ⓘ
purpose	electricity generation ⓘ plutonium production ⓘ plutonium production for nuclear weapons ⓘ
reactorType	graphite-moderated reactor ⓘ
startConstruction	1943 ⓘ 1943 ⓘ
status	permanently shut down ⓘ

How these facts were elicited