Calvert Cliffs Nuclear Power Plant
E92822
Calvert Cliffs Nuclear Power Plant is a two-unit pressurized water nuclear power station on the western shore of the Chesapeake Bay that generates electricity for the Mid-Atlantic region.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Calvert Cliffs Nuclear Power Plant canonical | 4 |
| Calvert Cliffs Nuclear Power Plant Unit 1 | 2 |
| Calvert Cliffs Nuclear Power Plant Unit 2 | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T785786 — 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: Calvert Cliffs Nuclear Power Plant Context triple: [Calvert County, Maryland, hasPowerPlant, Calvert Cliffs Nuclear Power Plant]
-
A.
Hope Creek Nuclear Generating Station
Hope Creek Nuclear Generating Station is a single-unit boiling water nuclear power plant located in Lower Alloways Creek Township, New Jersey, that generates electricity for the regional grid.
-
B.
Hatch Nuclear Power Plant
Hatch Nuclear Power Plant is a commercial nuclear power generating facility in Georgia that supplies electricity to the regional grid as part of Southern Company's energy portfolio.
-
C.
Enrico Fermi Nuclear Generating Station
The Enrico Fermi Nuclear Generating Station is a nuclear power plant complex located on the shore of Lake Erie in Michigan, known for housing multiple reactor units including the Fermi 2 boiling water reactor.
-
D.
Vogtle Electric Generating Plant
Vogtle Electric Generating Plant is a major nuclear power facility in Georgia, USA, notable for hosting some of the first newly constructed commercial nuclear reactors in the country in decades.
-
E.
Seabrook
Seabrook is a residential area or neighborhood located within the town of Mashpee on Cape Cod in Massachusetts.
- 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: Calvert Cliffs Nuclear Power Plant Target entity description: Calvert Cliffs Nuclear Power Plant is a two-unit pressurized water nuclear power station on the western shore of the Chesapeake Bay that generates electricity for the Mid-Atlantic region.
-
A.
Hope Creek Nuclear Generating Station
Hope Creek Nuclear Generating Station is a single-unit boiling water nuclear power plant located in Lower Alloways Creek Township, New Jersey, that generates electricity for the regional grid.
-
B.
Hatch Nuclear Power Plant
Hatch Nuclear Power Plant is a commercial nuclear power generating facility in Georgia that supplies electricity to the regional grid as part of Southern Company's energy portfolio.
-
C.
Enrico Fermi Nuclear Generating Station
The Enrico Fermi Nuclear Generating Station is a nuclear power plant complex located on the shore of Lake Erie in Michigan, known for housing multiple reactor units including the Fermi 2 boiling water reactor.
-
D.
Vogtle Electric Generating Plant
Vogtle Electric Generating Plant is a major nuclear power facility in Georgia, USA, notable for hosting some of the first newly constructed commercial nuclear reactors in the country in decades.
-
E.
Seabrook
Seabrook is a residential area or neighborhood located within the town of Mashpee on Cape Cod in Massachusetts.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
electric power station
ⓘ
nuclear power plant ⓘ |
| commercialOperationStart | 1975 ⓘ |
| commissioned | 1975 ⓘ |
| connectsTo |
PJM Interconnection
ⓘ
surface form:
PJM regional transmission organization
regional transmission grid ⓘ |
| constructionStart | 1969 ⓘ |
| coolingSource | Chesapeake Bay ⓘ |
| coolingSystemType | once-through cooling ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designedNetCapacity | approximately 1735 MWe ⓘ |
| energySource | nuclear fission ⓘ |
| fuelType |
enriched uranium
ⓘ
uranium dioxide ⓘ |
| gridConnection | PJM Interconnection ⓘ |
| hasContainmentType | reinforced concrete containment ⓘ |
| hasEmergencyPlanningZone |
10-mile plume exposure pathway EPZ
ⓘ
50-mile ingestion pathway EPZ ⓘ |
| hasUnit |
Calvert Cliffs Nuclear Power Plant
self-linksurface differs
ⓘ
surface form:
Calvert Cliffs Nuclear Power Plant Unit 1
Calvert Cliffs Nuclear Power Plant self-linksurface differs ⓘ
surface form:
Calvert Cliffs Nuclear Power Plant Unit 2
|
| locatedIn |
Calvert County, Maryland
ⓘ
East Coast of the United States ⓘ
surface form:
United States East Coast
|
| locatedOn | western shore of the Chesapeake Bay ⓘ |
| namedAfter | Calvert Cliffs ⓘ |
| near | Lusby, Maryland ⓘ |
| netElectricalCapacity | over 1600 MWe ⓘ |
| numberOfUnits | 2 ⓘ |
| operator | Constellation Energy ⓘ |
| originalOwner |
Exelon
ⓘ
surface form:
Baltimore Gas and Electric Company
|
| owner | Constellation Energy ⓘ |
| partOf | U.S. nuclear power fleet ⓘ |
| primaryCoolant | water ⓘ |
| purpose | electricity generation ⓘ |
| reactorModel | Combustion Engineering PWR ⓘ |
| reactorSupplier | Combustion Engineering ⓘ |
| reactorTechnologyGeneration | Generation II ⓘ |
| reactorType | pressurized water reactor ⓘ |
| regionServed |
Mid-Atlantic states
ⓘ
surface form:
Mid-Atlantic region
|
| regulatoryAuthority | U.S. Nuclear Regulatory Commission ⓘ |
| safetySystemType | pressurized water reactor safety systems ⓘ |
| state | Maryland ⓘ |
| status | operational ⓘ |
| suppliesElectricityTo |
Maryland
ⓘ
Mid-Atlantic states ⓘ
surface form:
Mid-Atlantic United States
|
| unit1Commissioned | 1975 ⓘ |
| unit2Commissioned | 1977 ⓘ |
| unitCount | 2 ⓘ |
| usesReactorCoolant | light water ⓘ |
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: Calvert Cliffs Nuclear Power Plant Description of subject: Calvert Cliffs Nuclear Power Plant is a two-unit pressurized water nuclear power station on the western shore of the Chesapeake Bay that generates electricity for the Mid-Atlantic region.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
Calvert Cliffs Nuclear Power Plant
→
hasUnit
→
Calvert Cliffs Nuclear Power Plant
self-linksurface differs
ⓘ
this entity surface form:
Calvert Cliffs Nuclear Power Plant Unit 1
Calvert Cliffs Nuclear Power Plant
→
hasUnit
→
Calvert Cliffs Nuclear Power Plant
self-linksurface differs
ⓘ
this entity surface form:
Calvert Cliffs Nuclear Power Plant Unit 2
this entity surface form:
Calvert Cliffs Nuclear Power Plant Unit 1
this entity surface form:
Calvert Cliffs Nuclear Power Plant Unit 2