NRX reactor
E290828
The NRX reactor was an early Canadian research nuclear reactor at Chalk River that played a key role in the development of nuclear science and technology.
All labels observed (3)
| Label | Occurrences |
|---|---|
| NRX reactor canonical | 2 |
| NRX reactor was heavily damaged | 1 |
| NRX reactor was later repaired and returned to service | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2702435 — 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: NRX reactor Context triple: [Chalk River Laboratories, hasPart, NRX reactor]
-
A.
K Reactor
K Reactor is a decommissioned nuclear production reactor at the Savannah River Site in South Carolina that was used primarily for producing weapons-grade materials during the Cold War.
-
B.
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.
-
C.
DR Reactor
The DR Reactor was one of the plutonium-producing nuclear reactors at the Hanford Site, built during the Manhattan Project era to support U.S. nuclear weapons production.
-
D.
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.
-
E.
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.
- 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: NRX reactor Target entity description: The NRX reactor was an early Canadian research nuclear reactor at Chalk River that played a key role in the development of nuclear science and technology.
-
A.
K Reactor
K Reactor is a decommissioned nuclear production reactor at the Savannah River Site in South Carolina that was used primarily for producing weapons-grade materials during the Cold War.
-
B.
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.
-
C.
DR Reactor
The DR Reactor was one of the plutonium-producing nuclear reactors at the Hanford Site, built during the Manhattan Project era to support U.S. nuclear weapons production.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear reactor
ⓘ
nuclear research reactor ⓘ research reactor ⓘ |
| accidentConsequence |
contamination of reactor systems
ⓘ
core damage ⓘ release of radioactive material into reactor building ⓘ |
| accidentDate | 1952 ⓘ |
| accidentType | power excursion ⓘ |
| commissioned | 1947 ⓘ |
| coolant | light water ⓘ |
| country | Canada ⓘ |
| designedBy |
British nuclear scientists
ⓘ
Canadian nuclear scientists ⓘ |
| era | early Cold War period ⓘ |
| firstCriticality | 1947 ⓘ |
| fuelType | natural uranium ⓘ |
| gridConnection | not primarily used for electricity generation ⓘ |
| influenced | development of CANDU reactor technology ⓘ |
| locatedInFacility |
Chalk River Laboratories
ⓘ
surface form:
Chalk River Laboratories site
|
| location |
Chalk River Laboratories
ⓘ
Chalk River ⓘ
surface form:
Chalk River, Ontario
|
| moderator | heavy water ⓘ |
| neutronSpectrum | thermal ⓘ |
| notableAccident | NRX reactor accident of 1952 ⓘ |
| operator |
Atomic Energy of Canada Limited
ⓘ
National Research Council Canada ⓘ
surface form:
National Research Council of Canada
|
| ownedBy |
Canadian federal government (Ottawa)
ⓘ
surface form:
Government of Canada
|
| partOf |
Chalk River Laboratories
ⓘ
surface form:
Chalk River nuclear site
early Canadian nuclear program ⓘ |
| primaryUse |
materials testing
ⓘ
neutron physics experiments ⓘ nuclear research ⓘ radioisotope production ⓘ |
| reactorType |
heavy-water moderated research reactor
ⓘ
tank-type research reactor ⓘ |
| researchOutput |
contributed to fundamental neutron physics
ⓘ
contributed to reactor design knowledge ⓘ |
| shutdown | 1992 ⓘ |
| significance |
one of the most powerful research reactors of its time
ⓘ
played key role in development of nuclear science and technology in Canada ⓘ |
| startOfConstruction | 1944 ⓘ |
| status | decommissioned ⓘ |
| successor | NRU reactor ⓘ |
| usedFor |
neutron beam experiments
ⓘ
production of medical radioisotopes ⓘ testing of reactor materials and 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: NRX reactor Description of subject: The NRX reactor was an early Canadian research nuclear reactor at Chalk River that played a key role in the development of nuclear science and technology.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
NRX reactor was heavily damaged
this entity surface form:
NRX reactor was later repaired and returned to service