GLEEP research reactor
E663514
The GLEEP research reactor was the United Kingdom’s first nuclear reactor, a low-power graphite-moderated facility used primarily for research and materials testing at Harwell.
All labels observed (1)
| Label | Occurrences |
|---|---|
| GLEEP research reactor canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7433147 — 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: GLEEP research reactor Context triple: [Atomic Energy Research Establishment Harwell, hasReactor, GLEEP research reactor]
-
A.
TRIGA research reactor
The TRIGA research reactor is a small, inherently safe nuclear reactor design widely used in universities and research institutions for education, training, and scientific experiments.
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B.
Brookhaven Graphite Research Reactor
The Brookhaven Graphite Research Reactor was one of the earliest large research reactors in the United States, used primarily for neutron physics experiments and materials research at Brookhaven National Laboratory.
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C.
HANARO research reactor
The HANARO research reactor is a multi-purpose nuclear research facility in South Korea used for neutron science, materials testing, radioisotope production, and various nuclear technology applications.
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D.
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.
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E.
S2W nuclear reactor
The S2W nuclear reactor was an early U.S. Navy pressurized water reactor design that powered the world’s first operational nuclear-powered submarine, USS Nautilus.
- 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: GLEEP research reactor Target entity description: The GLEEP research reactor was the United Kingdom’s first nuclear reactor, a low-power graphite-moderated facility used primarily for research and materials testing at Harwell.
-
A.
TRIGA research reactor
The TRIGA research reactor is a small, inherently safe nuclear reactor design widely used in universities and research institutions for education, training, and scientific experiments.
-
B.
Brookhaven Graphite Research Reactor
The Brookhaven Graphite Research Reactor was one of the earliest large research reactors in the United States, used primarily for neutron physics experiments and materials research at Brookhaven National Laboratory.
-
C.
HANARO research reactor
The HANARO research reactor is a multi-purpose nuclear research facility in South Korea used for neutron science, materials testing, radioisotope production, and various nuclear technology applications.
-
D.
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.
-
E.
S2W nuclear reactor
The S2W nuclear reactor was an early U.S. Navy pressurized water reactor design that powered the world’s first operational nuclear-powered submarine, USS Nautilus.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear reactor
ⓘ
research reactor ⓘ |
| abbreviationOf | Graphite Low Energy Experimental Pile NERFINISHED ⓘ |
| commissionedBy | UK government NERFINISHED ⓘ |
| constructionStartDate | 1946 ⓘ |
| controlMethod | control rods ⓘ |
| coolant | air ⓘ |
| country | United Kingdom ⓘ |
| designedBy | British nuclear scientists ⓘ |
| era | early Cold War period ⓘ |
| firstCriticalityDate | 1947-08-15 ⓘ |
| firstCriticalityYear | 1947 ⓘ |
| fuelForm | metallic uranium ⓘ |
| fuelType | natural uranium ⓘ |
| gridConnection | not connected to electrical grid ⓘ |
| historicalRole |
early development of the UK nuclear program
ⓘ
testbed for materials for power reactors ⓘ |
| lifetimeUse | training of reactor operators ⓘ |
| location |
Atomic Energy Research Establishment, Harwell
NERFINISHED
ⓘ
Harwell, Oxfordshire NERFINISHED ⓘ |
| moderator | graphite ⓘ |
| nameMeaning | Graphite Low Energy Experimental Pile NERFINISHED ⓘ |
| neutronSource | fission chain reaction in natural uranium fuel ⓘ |
| neutronSpectrum | thermal ⓘ |
| operator | United Kingdom Atomic Energy Authority NERFINISHED ⓘ |
| ownership | United Kingdom Atomic Energy Authority NERFINISHED ⓘ |
| partOf | Atomic Energy Research Establishment Harwell reactor facilities NERFINISHED ⓘ |
| powerGeneration | no commercial electricity production ⓘ |
| powerOutput | low power ⓘ |
| primaryUse |
materials testing
ⓘ
research ⓘ |
| purpose |
materials irradiation testing
ⓘ
neutron irradiation experiments ⓘ reactor physics research ⓘ |
| reactorType |
air-cooled reactor
ⓘ
graphite-moderated reactor ⓘ |
| researchField |
materials science
ⓘ
nuclear physics ⓘ reactor engineering ⓘ |
| safetyFeatures | low power level for experimental safety ⓘ |
| shutdownYear | 1990 ⓘ |
| significance | first nuclear reactor in the United Kingdom ⓘ |
| status | shut down ⓘ |
| usedFor |
calibration of neutron detectors
ⓘ
measurement of neutron cross-sections ⓘ testing of reactor components ⓘ |
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: GLEEP research reactor Description of subject: The GLEEP research reactor was the United Kingdom’s first nuclear reactor, a low-power graphite-moderated facility used primarily for research and materials testing at Harwell.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.