Which of the following describes a dangerous occurrence that may require reporting under RIDDOR in relation to a fire?

• A. Explosion, collapse or bursting of any closed vessel or associated pipework.
• B. A routine fire drill conducted after hours.
• C. A spill of water from a broken pipe.
• D. A minor scratch during a drill.

Answer: (A)

Under RIDDOR, a dangerous occurrence is an unplanned event that could put people at serious risk, even if no one is injured yet. In a fire scenario, the explosion, collapse or bursting of any closed vessel or its associated pipework fits this because a pressurized vessel or pipe can release flammable or toxic contents or rupture violently, potentially causing a fire or injuries. This kind of incident is something that must be reported to the Health and Safety Executive as a dangerous occurrence. The other options describe routine activities or minor incidents that do not meet the criteria for a reportable dangerous occurrence under RIDDOR.