Unit 3 reactor building
E790333
The Unit 3 reactor building at the Fukushima Daiichi Nuclear Power Plant is one of the severely damaged reactor structures from the 2011 disaster, known for suffering a catastrophic explosion and major radioactive release.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Unit 3 reactor building canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9296224 — 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: Unit 3 reactor building Context triple: [Fukushima Daiichi Nuclear Power Plant, hydrogenExplosionsOccurredIn, Unit 3 reactor building]
-
A.
PM-3A nuclear reactor
The PM-3A nuclear reactor was a small U.S. Navy-built nuclear power plant that supplied electricity and heat to McMurdo Station in Antarctica during the 1960s and early 1970s.
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B.
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.
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C.
Reactor No. 4
Reactor No. 4 was the RBMK nuclear reactor at the Chernobyl Nuclear Power Plant whose catastrophic explosion in 1986 caused one of the worst nuclear disasters in history.
-
D.
NRU reactor
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.
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E.
Unit 3 (nuclear)
Unit 3 (nuclear) is the decommissioned boiling water reactor unit of the Humboldt Bay Power Plant in California.
- 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: Unit 3 reactor building Target entity description: The Unit 3 reactor building at the Fukushima Daiichi Nuclear Power Plant is one of the severely damaged reactor structures from the 2011 disaster, known for suffering a catastrophic explosion and major radioactive release.
-
A.
PM-3A nuclear reactor
The PM-3A nuclear reactor was a small U.S. Navy-built nuclear power plant that supplied electricity and heat to McMurdo Station in Antarctica during the 1960s and early 1970s.
-
B.
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.
-
C.
Reactor No. 4
Reactor No. 4 was the RBMK nuclear reactor at the Chernobyl Nuclear Power Plant whose catastrophic explosion in 1986 caused one of the worst nuclear disasters in history.
-
D.
NRU reactor
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.
-
E.
Unit 3 (nuclear)
Unit 3 (nuclear) is the decommissioned boiling water reactor unit of the Humboldt Bay Power Plant in California.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear reactor unit building
ⓘ
reactor building ⓘ |
| alsoKnownAs | Fukushima Daiichi Unit 3 reactor building NERFINISHED ⓘ |
| associatedWith | major radioactive release ⓘ |
| commercialOperationStart | 1976 ⓘ |
| constructionStart | early 1970s ⓘ |
| containmentType | Mark I containment ⓘ |
| country | Japan ⓘ |
| dateOfMajorAccident | 2011-03-11 ⓘ |
| decommissioningStatus | under decommissioning ⓘ |
| designElectricalOutput | 784 MWe ⓘ |
| event |
2011 Tōhoku earthquake and tsunami
ⓘ
Fukushima Daiichi nuclear disaster NERFINISHED ⓘ |
| experienced | hydrogen explosion ⓘ |
| explosionDate | 2011-03-14 ⓘ |
| explosionEffect |
damage to spent fuel pool area structures
ⓘ
destruction of reactor building superstructure ⓘ severe structural damage to upper floors ⓘ |
| explosionType | hydrogen-air deflagration ⓘ |
| fuelType |
mixed oxide fuel
ⓘ
uranium dioxide fuel ⓘ |
| gridConnectionDate | 1976 ⓘ |
| hasComponent |
primary containment vessel
ⓘ
reactor pressure vessel ⓘ secondary containment ⓘ spent fuel pool ⓘ turbine building connection ⓘ |
| locatedIn | Ōkuma, Fukushima Prefecture, Japan NERFINISHED ⓘ |
| operator | Tokyo Electric Power Company NERFINISHED ⓘ |
| ownedBy | Tokyo Electric Power Company NERFINISHED ⓘ |
| partOf | Fukushima Daiichi Nuclear Power Plant NERFINISHED ⓘ |
| postAccidentCondition |
contaminated debris
ⓘ
high radiation levels ⓘ |
| radioactiveRelease |
airborne radionuclides to the environment
ⓘ
vented steam and fission products ⓘ |
| reactorModel | BWR-3 NERFINISHED ⓘ |
| reactorType | boiling water reactor ⓘ |
| regulatoryAuthority | Nuclear Regulation Authority of Japan NERFINISHED ⓘ |
| safetyIssue |
cooling loss in reactor core
ⓘ
cooling loss in spent fuel pool ⓘ hydrogen accumulation in upper floors ⓘ |
| status |
permanently shut down
ⓘ
severely damaged ⓘ |
| suffered |
core damage
ⓘ
loss of off-site power ⓘ loss of ultimate heat sink ⓘ partial core meltdown ⓘ station blackout ⓘ |
| usedMOXFuel | true ⓘ |
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: Unit 3 reactor building Description of subject: The Unit 3 reactor building at the Fukushima Daiichi Nuclear Power Plant is one of the severely damaged reactor structures from the 2011 disaster, known for suffering a catastrophic explosion and major radioactive release.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.