Pressurised water reactor
E346679
A pressurised water reactor is a type of nuclear fission reactor that uses high-pressure water as both coolant and neutron moderator to generate heat for producing electricity or naval propulsion.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Pressurised water reactor canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3317115 — 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: Pressurised water reactor Context triple: [Vanguard-class ballistic missile submarine, reactorType, Pressurised water reactor]
-
A.
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.
-
B.
ZEEP reactor
The ZEEP reactor was a small Canadian research nuclear reactor that played a key role in early nuclear physics experiments and the development of Canada's nuclear energy program.
-
C.
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.
-
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.
Rolls-Royce PWR2 nuclear reactor
The Rolls-Royce PWR2 is a British-designed pressurized water nuclear reactor used to provide long-endurance, high-power propulsion for the Royal Navy’s nuclear 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: Pressurised water reactor Target entity description: A pressurised water reactor is a type of nuclear fission reactor that uses high-pressure water as both coolant and neutron moderator to generate heat for producing electricity or naval propulsion.
-
A.
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.
-
B.
ZEEP reactor
The ZEEP reactor was a small Canadian research nuclear reactor that played a key role in early nuclear physics experiments and the development of Canada's nuclear energy program.
-
C.
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.
-
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.
Rolls-Royce PWR2 nuclear reactor
The Rolls-Royce PWR2 is a British-designed pressurized water nuclear reactor used to provide long-endurance, high-power propulsion for the Royal Navy’s nuclear submarines.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Nuclear reactor type
ⓘ
Thermal neutron reactor ⓘ |
| application |
Commercial nuclear power plants
ⓘ
Nuclear-powered aircraft carriers ⓘ Nuclear-powered submarines ⓘ |
| boilingInCore | Normally absent ⓘ |
| controlMechanism |
Control rod insertion and withdrawal
ⓘ
Soluble boron in coolant ⓘ |
| coolantOutletTemperatureTypical | Around 300 degrees Celsius ⓘ |
| coolantPressure | High pressure ⓘ |
| coolantPressureTypical | Around 150 atmospheres ⓘ |
| coolantState | Liquid water ⓘ |
| designLineage | Nautilus submarine reactor design ⓘ |
| developedIn |
United States of America
ⓘ
surface form:
United States
|
| developmentPeriod | 1950s ⓘ |
| distinguishedBy | Steam generation outside reactor core ⓘ |
| distinguishedFrom | Boiling water reactor ⓘ |
| dominantReactorType | Worldwide commercial nuclear fleet ⓘ |
| energySource | Nuclear fission ⓘ |
| fuelAssemblyType | Lattice of fuel rods ⓘ |
| fuelEnrichmentRange | Typically 3–5% U-235 for commercial units ⓘ |
| fuelForm | Fuel rods ⓘ |
| hasComponent |
Containment building
ⓘ
Control rods ⓘ Pressuriser ⓘ Primary coolant loop ⓘ Reactor pressure vessel ⓘ Secondary coolant loop ⓘ Steam generator ⓘ |
| heatTransferMechanism | Primary-to-secondary heat exchange ⓘ |
| moderationMechanism | Elastic scattering in water ⓘ |
| navalFuelEnrichment | Higher enrichment than commercial units ⓘ |
| neutronSpectrum | Thermal ⓘ |
| primaryCoolantRadioactivity | Radioactive ⓘ |
| primaryFunction |
Electricity generation
ⓘ
Naval propulsion ⓘ |
| reactivityControlMethod | Chemical shim ⓘ |
| regulatoryUse | Standard design in many countries ⓘ |
| requires | High-integrity pressure vessel ⓘ |
| safetyCharacteristic |
Negative moderator density coefficient
ⓘ
Negative temperature coefficient of reactivity ⓘ Strong containment structure ⓘ |
| secondaryCoolantRadioactivity | Non-radioactive under normal operation ⓘ |
| steamCycleType | Rankine cycle ⓘ |
| steamProductionLocation | Steam generator ⓘ |
| thermalEfficiency | Moderate ⓘ |
| usesCoolant | Water ⓘ |
| usesFuel |
Low-enriched uranium
ⓘ
UO2 fuel pellets ⓘ |
| usesModerator | 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: Pressurised water reactor Description of subject: A pressurised water reactor is a type of nuclear fission reactor that uses high-pressure water as both coolant and neutron moderator to generate heat for producing electricity or naval propulsion.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Vanguard-class ballistic missile submarine