HIAD events | Clean Hydrogen Knowledge Hub

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17/09/1999
United States

Explosion at the off-gas of a nuclear power plant

Event ID: 509
Quality: 2
Application: Power plant
Component involved: off-gas system
Hydrogen supply chain stage: Unintended hydrogen production - chemical reaction
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2020

03/10/1977
United Kingdom

Fire - at the vent stack of a hydrochloric acid production plant

Event ID: 508
Quality: 2
Application: Chemical industry
Component involved: venting system (exit)
Hydrogen supply chain stage: hydrogen as by-product
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2020

27/08/1972
United States

Explosion in the desulphurisation unit of a refinery

Event ID: 507
Quality: 2
Application: Petrochemical industry
Component involved: heat exchanger (pipe)
Hydrogen supply chain stage: Hydrogen as process gas
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 28/01/2026

13/07/1972
United States

Explosion in a chlorine production plant

Event ID: 506
Quality: 2
Application: Chemical industry
Component involved: electrolytic cell
Hydrogen supply chain stage: Hydrogen as feedstock
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 28/01/2026

08/04/1999
United States

Fire at a generator of a power plant

Event ID: 505
Quality: 5
Application: Power plant
Component involved: H2 coolant system (pipe)
Hydrogen supply chain stage: Hydrogen as coolant
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/08/2024

01/01/1971
United States

Explosion on the off-gas system of a nuclear power plant

Event ID: 504
Quality: 2
Application: Power plant
Component involved: off-gas system (pipe)
Hydrogen supply chain stage: Unintended hydrogen production - radiolysis
Nature of the consequences: fire
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 28/01/2026

06/06/1996
United States

Explosion on hydrogen dryers at a nuclear power plant

Event ID: 503
Quality: 3
Application: Power plant
Component involved: hydrogen dryers
Hydrogen supply chain stage: Hydrogen production
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2017

08/12/1971
United States

Explosion inside the off-gas system of a nuclear power plant

Event ID: 502
Quality: 2
Application: Power plant
Component involved: off-gas system (pipe)
Hydrogen supply chain stage: Unintended hydrogen production - radiolysis
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 28/01/2026

22/05/1996
United States

Hydrogen accidental formation and ignition at a spent fuel cask of a nuclear power plant

Event ID: 501
Quality: 4
Application: Power plant
Component involved: chemical storage tank
Hydrogen supply chain stage: Unintended hydrogen production - radiolysis
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 01/01/2017

23/10/2007
United States

Fire in a LH2 Storage Vessel

Event ID: 500
Quality: 4
Application: Non-road vehicles
Component involved: LH2 tank (stationary)
Hydrogen supply chain stage: hydrogen storage
Nature of the consequences: explosion
Classification of the physical effects: Hydrogen Release and Ignition
Date entry in HIAD: 30/10/2025