Event
- Event ID
- 862
- Quality
- Description
A triangle flask exploded during a science-class experiment where diluted hydrochloric acid was made to react with zinc to generate hydrogen, at a junior high school.
Injures were caused by glass debris flown, five very lightly injured pupils were sent to hospital.
Probably hydrogen entered in contact with oxygen because of a wrong experiment procedure, resulting in ignition and explosion.
- Event Initiating system
- Classification of the physical effects
- Hydrogen Release and Ignition
- Nature of the consequences
- Macro-region
- Asia
- Country
- Japan
- Date
- Component involved
- reactor / oven / furnace / test chamber
- Failure mode
- rupture & ignition
- Initiating cause
- run-away reaction
- Root CAUSE analysis
The report of the database RISCAD was giving these 3 causes: [1st] Human factor [2nd] Unsuitable action/operation [3rd] Operation mistake/Work mistake.
It is highly probable that a mistake took place during the excution of the school incidents. Managing a school class is moredifficult than supervising a team of experts. Further causes could be a indeed a badly written execution , as well as wrong choice of substances. It is impossible however to identify root factors, in absecens of evidences.- Root causes
- Date entry in HIAD
- 01/01/2020
Facility
- Application
- Laboratory / R&D
- Sub-application
- School chemical lab
- Hydrogen supply chain stage
- Process temperature range [C]
- ambient temperature (-50°C to +50°C)
- Location type
- Unknown
- Location
- populated area
- Operational condition
Emergency & Consequences
- Number of fatalities
- 0
- Number of injured persons
- 5
- Post-event summary
Five pupils were sent to hospital with very lightly injuries, caused by glass debris flown during the explosion.
In-depth data
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Release temperature [°C]
- 25
- Probable IGNITION SOURCE
- Explosion type
References
- Sources categories
- RISCAD
- Reference & weblink
Orignal source lost. RISCAD is closed.
http://www.aist.go.jp/RIODB/RISCAD
(not accessible anymore
