NRU reactor
E290829
The NRU reactor was a Canadian research nuclear reactor at Chalk River Laboratories known for producing medical isotopes and supporting materials testing and reactor physics research.
All labels observed (2)
| Label | Occurrences |
|---|---|
| NRU reactor canonical | 3 |
| NRU reactor fire of 1958 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2702436 — 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: NRU reactor Context triple: [Chalk River Laboratories, hasPart, NRU reactor]
-
A.
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.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
K15 pressurized water reactor
The K15 pressurized water reactor is a French naval nuclear reactor design used to power modern French aircraft carriers and submarines.
- 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: NRU reactor Target entity description: The NRU reactor was a Canadian research nuclear reactor at Chalk River Laboratories known for producing medical isotopes and supporting materials testing and reactor physics research.
-
A.
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.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
K15 pressurized water reactor
The K15 pressurized water reactor is a French naval nuclear reactor design used to power modern French aircraft carriers and submarines.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
materials testing reactor
ⓘ
research nuclear reactor ⓘ |
| ageAtShutdown | about 60 years ⓘ |
| commissioningDate | 1957-11-03 ⓘ |
| constructionStartDate | 1949-06-01 ⓘ |
| continent | North America ⓘ |
| coolant | light water ⓘ |
| country | Canada ⓘ |
| decommissioningStatus | in decommissioning ⓘ |
| designedBy | Atomic Energy of Canada Limited ⓘ |
| endOfOperation | 2018 ⓘ |
| firstCriticalityDate | 1957-11-03 ⓘ |
| fuelForm | plate-type fuel ⓘ |
| fuelType | highly enriched uranium ⓘ |
| heritageStatus | historically significant Canadian nuclear facility ⓘ |
| locatedIn |
Chalk River
ⓘ
surface form:
Chalk River, Ontario
|
| locatedOnRiver | Ottawa River ⓘ |
| location | Chalk River Laboratories ⓘ |
| moderator | heavy water ⓘ |
| notableFor |
materials testing for CANDU reactors
ⓘ
production of medical isotopes ⓘ |
| operator |
Atomic Energy of Canada Limited
ⓘ
Chalk River Laboratories ⓘ
surface form:
Canadian Nuclear Laboratories
|
| ownedBy | Atomic Energy of Canada Limited ⓘ |
| partOf |
Chalk River Laboratories
ⓘ
surface form:
Chalk River Laboratories site
|
| permanentShutdownDate | 2018-03-31 ⓘ |
| producedIsotope |
cobalt-60
ⓘ
iodine-125 ⓘ iodine-131 ⓘ lutetium-177 ⓘ molybdenum-99 ⓘ xenon-133 ⓘ |
| purpose |
materials testing
ⓘ
medical isotope production ⓘ reactor physics research ⓘ research ⓘ |
| reactorType |
heavy water moderated reactor
ⓘ
tank-type reactor ⓘ |
| regulator | Canadian Nuclear Safety Commission ⓘ |
| replacedBy | other international isotope production reactors ⓘ |
| safetySystemUpgradeIssue | 2007 emergency power and pump upgrades dispute ⓘ |
| shutdownDate | 2018-03-31 ⓘ |
| startOfOperation | 1957 ⓘ |
| sufferedAccident |
1958 fuel rupture and fire
ⓘ
1997 heavy water leak ⓘ 2007 safety-related shutdown ⓘ |
| supportedTechnology | CANDU reactor development ⓘ |
| thermalPower | 135 megawatts thermal ⓘ |
| worldShareOfMo99Production | about 30 percent at peak ⓘ |
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: NRU reactor Description of subject: The NRU reactor was a Canadian research nuclear reactor at Chalk River Laboratories known for producing medical isotopes and supporting materials testing and reactor physics research.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
NRU reactor fire of 1958