Mark I

E799459

boiling water reactor containment system nuclear reactor containment design

Mark I is a General Electric-designed boiling water reactor containment system characterized by a compact, pressure-suppression torus configuration used in several nuclear power plants worldwide.

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All labels observed (2)

Label	Occurrences
Mark I containment	2
Mark I canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T9446803 — 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: Mark I
Context triple: [Fukushima Daiichi Unit 2, containmentType, Mark I]

A. Mark I
Mark I is the first crude, improvised Iron Man armor suit built by Tony Stark in captivity, serving as the prototype for all subsequent Iron Man armors.
B. Mark I tank
The Mark I tank was the world’s first operational armored fighting vehicle, introduced by Britain during World War I to break the stalemate of trench warfare.
C. Mark II
Mark II is Tony Stark’s early silver-colored Iron Man armor prototype that served as the basis for later, more advanced suits.
D. Mark I trains
Mark I trains were the original streamlined monorail vehicles introduced at Disneyland, showcasing mid-20th-century futuristic design and serving as an early icon of modern theme park transportation.
E. Mark I armor
The Mark I armor is Tony Stark’s first crude, improvised Iron Man suit, built in captivity and serving as the prototype for all subsequent Iron Man armors.
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: Mark I
Target entity description: Mark I is a General Electric-designed boiling water reactor containment system characterized by a compact, pressure-suppression torus configuration used in several nuclear power plants worldwide.

A. Mark I
Mark I is the first crude, improvised Iron Man armor suit built by Tony Stark in captivity, serving as the prototype for all subsequent Iron Man armors.
B. Mark I tank
The Mark I tank was the world’s first operational armored fighting vehicle, introduced by Britain during World War I to break the stalemate of trench warfare.
C. Mark II
Mark II is Tony Stark’s early silver-colored Iron Man armor prototype that served as the basis for later, more advanced suits.
D. Mark I trains
Mark I trains were the original streamlined monorail vehicles introduced at Disneyland, showcasing mid-20th-century futuristic design and serving as an early icon of modern theme park transportation.
E. Mark I armor
The Mark I armor is Tony Stark’s first crude, improvised Iron Man suit, built in captivity and serving as the prototype for all subsequent Iron Man armors.
F. None of above. chosen

Statements (47)

Predicate	Object
instanceOf	boiling water reactor containment system ⓘ nuclear reactor containment design ⓘ
belongsToSeries	GE BWR containment Mark series ⓘ linked to: GE Mark I
contrastedWith	Mark II containment ⓘ Mark III containment ⓘ large dry containment ⓘ
countryOfUse	Japan ⓘ United States ⓘ linked to: United States of America several other countries ⓘ
designer	General Electric ⓘ
developedBy	General Electric Nuclear Energy ⓘ linked to: General Electric
followedBy	Mark II ⓘ Mark III ⓘ
hasComponent	drywell ⓘ suppression pool ⓘ torus-shaped suppression pool ⓘ vent pipes from drywell to suppression pool ⓘ wetwell ⓘ
hasConfiguration	pressure-suppression containment ⓘ
hasCriticism	limited margin for pressure buildup in severe accidents ⓘ
hasDesignElement	reinforced concrete secondary containment structures ⓘ steel primary containment structure ⓘ
hasDesignGoal	provide pressure suppression capability ⓘ reduce containment size and cost ⓘ
hasFeature	compact containment volume ⓘ pressure-suppression torus ⓘ wetwell and drywell arrangement ⓘ
hasMitigationMeasure	filtered vent systems ⓘ hardened containment vent systems ⓘ
hasRegulatoryAttention	true ⓘ
hasRiskConcern	potential for hydrogen accumulation ⓘ vulnerability to severe core damage events ⓘ
hasShape	compact torus configuration ⓘ
introducedAs	early generation BWR containment design ⓘ
manufacturer	General Electric ⓘ
notableEventAssociation	Fukushima Daiichi nuclear disaster ⓘ
precededBy	early prototype BWR containments ⓘ
pressureSuppressionMethod	steam condensation in suppression pool ⓘ
primaryFunction	containment of radioactive materials in accident conditions ⓘ pressure suppression during loss-of-coolant accidents ⓘ
reactorType	boiling water reactor ⓘ
safetyEnhancement	post-Fukushima backfit modifications in several plants ⓘ
safetyObjective	limit release of fission products during accidents ⓘ
typicalApplication	BWR units of small to medium electrical output ⓘ
usedIn	boiling water reactor nuclear power plants ⓘ commercial nuclear power plants ⓘ
usedWorldwide	true ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Fukushima Daiichi Unit 2 → containmentType → Mark I ⓘ

Unit 3 (nuclear) → safetyContainmentType → Mark I containment ⓘ

linked to: Mark I

BWR-3 → primaryContainmentType → Mark I containment ⓘ