Triple

T9446838

Position	Surface form	Disambiguated ID	Type / Status
Subject	Fukushima Daiichi Unit 2	`E227784`	entity
Predicate	sisterUnit	`P19167`	FINISHED
Object	Fukushima Daiichi Unit 1 Fukushima Daiichi Unit 1 is the first reactor unit at Japan’s Fukushima Daiichi Nuclear Power Plant and one of the units that suffered a major meltdown in the 2011 nuclear disaster.	`E799461`	NE FINISHED

How this triple was built (4 steps)

Every LLM step that produced this triple, in pipeline order — named-entity classification, the disambiguation choices (the exact options shown, with the pick highlighted), and the generated description. The batch + timestamp of each is in the Provenance table below.

NER Named-entity recognition gpt-5-mini

Instruction

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Input

Phrase: Fukushima Daiichi Unit 1 | Statement: [Fukushima Daiichi Unit 2, sisterUnit, Fukushima Daiichi Unit 1]

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Fukushima Daiichi Unit 1
Context triple: [Fukushima Daiichi Unit 2, sisterUnit, Fukushima Daiichi Unit 1]

A. Fukushima Daiichi Unit 4
Fukushima Daiichi Unit 4 is one of the reactors at Japan’s Fukushima Daiichi Nuclear Power Plant that suffered severe damage and a spent fuel pool crisis following the 2011 earthquake and tsunami.
B. Fukushima Daiichi Unit 2
Fukushima Daiichi Unit 2 is one of the damaged reactors at Japan’s Fukushima Daiichi Nuclear Power Plant that suffered a core meltdown and severe structural failures following the 2011 earthquake and tsunami.
C. Fukushima Daiichi Unit 3
Fukushima Daiichi Unit 3 is one of the damaged reactors at Japan’s Fukushima Daiichi Nuclear Power Plant, known for suffering a hydrogen explosion and core meltdown during the 2011 nuclear disaster.
D. Fukushima Daiichi Nuclear Power Plant
Fukushima Daiichi Nuclear Power Plant is a coastal Japanese nuclear power station in Ōkuma, Fukushima Prefecture, widely known as the site of the 2011 reactor meltdowns following a massive earthquake and tsunami.
E. Fukushima Daini Nuclear Power Plant
Fukushima Daini Nuclear Power Plant is a Japanese coastal nuclear power station in Fukushima Prefecture that experienced a significant but more contained impact from the 2011 Tōhoku earthquake and tsunami than its neighboring Daiichi plant.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NEDg Description generation gpt-5.1

Instruction

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Input

Entity: Fukushima Daiichi Unit 1
Triple: [Fukushima Daiichi Unit 2, sisterUnit, Fukushima Daiichi Unit 1]

Generated description

Fukushima Daiichi Unit 1 is the first reactor unit at Japan’s Fukushima Daiichi Nuclear Power Plant and one of the units that suffered a major meltdown in the 2011 nuclear disaster.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Fukushima Daiichi Unit 1
Target entity description: Fukushima Daiichi Unit 1 is the first reactor unit at Japan’s Fukushima Daiichi Nuclear Power Plant and one of the units that suffered a major meltdown in the 2011 nuclear disaster.

A. Fukushima Daiichi Unit 4
Fukushima Daiichi Unit 4 is one of the reactors at Japan’s Fukushima Daiichi Nuclear Power Plant that suffered severe damage and a spent fuel pool crisis following the 2011 earthquake and tsunami.
B. Fukushima Daiichi Unit 2
Fukushima Daiichi Unit 2 is one of the damaged reactors at Japan’s Fukushima Daiichi Nuclear Power Plant that suffered a core meltdown and severe structural failures following the 2011 earthquake and tsunami.
C. Fukushima Daiichi Unit 3
Fukushima Daiichi Unit 3 is one of the damaged reactors at Japan’s Fukushima Daiichi Nuclear Power Plant, known for suffering a hydrogen explosion and core meltdown during the 2011 nuclear disaster.
D. Fukushima Daiichi Nuclear Power Plant
Fukushima Daiichi Nuclear Power Plant is a coastal Japanese nuclear power station in Ōkuma, Fukushima Prefecture, widely known as the site of the 2011 reactor meltdowns following a massive earthquake and tsunami.
E. Fukushima Daini Nuclear Power Plant
Fukushima Daini Nuclear Power Plant is a Japanese coastal nuclear power station in Fukushima Prefecture that experienced a significant but more contained impact from the 2011 Tōhoku earthquake and tsunami than its neighboring Daiichi plant.
F. None of above. chosen

Provenance (5 batches)

The batch behind each pipeline step, in order, with when it ran. Timestamps are batch-level — stages were processed in waves, so the object chain (NER → NED1 → NEDg → NED2) reads in order, but predicate / elicitation batches can sit in a different wave.

Step	Stage	Batch ID	Status	When
creating	Elicitation	`batch_69ca8439f8bc8190997f2ef40c9f0bc2`	completed	March 30, 2026, 2:10 p.m.
NER	Named-entity recognition	`batch_69cd7f35394c8190aa77528dabd6139c`	completed	April 1, 2026, 8:25 p.m.
NED1	Entity disambiguation (via context triple)	`batch_69d1106aeb708190bbbe1d05b7472194`	completed	April 4, 2026, 1:21 p.m.
NEDg	Description generation	`batch_69d111213e9081909865b086681d1bbd`	completed	April 4, 2026, 1:24 p.m.
NED2	Entity disambiguation (via description)	`batch_69d111ab40a48190bb77c1cf80ef87a8`	completed	April 4, 2026, 1:27 p.m.

Created at: March 30, 2026, 7:51 p.m.