Regulatory Compliance
What is a Safety Case? Demonstrating Control of Major Accident Hazards
Vinit Pandey · Published 4 August 2026
In short: A Safety Case is a structured document demonstrating that major accident hazards at a facility have been identified and that risks are being controlled to a tolerable level, typically required for facilities notified as Major Accident Hazard installations.
Key takeaways
- A Safety Case integrates hazard identification, risk assessment, and safety management system evidence
- It references underlying studies rather than repeating their full technical content
- A credible Safety Case demonstrates ALARP, not just that risk is below a threshold
- Safety Cases require updates as hazards, risk conclusions, or management systems change materially
A Safety Case brings together the outputs of hazard identification, quantitative or semi-quantitative risk assessment, and the facility's safety management system into a single demonstration that major hazards are understood and adequately controlled.
Unlike a single study such as HAZOP or QRA, a Safety Case is an integrating document: it references the underlying studies and management system evidence rather than repeating their full technical content, presenting the overall safety argument for regulatory or corporate review.
A credible Safety Case typically demonstrates ALARP — showing not just that risk is below a tolerability threshold, but that reasonably practicable further risk reduction measures have been considered and either implemented or justifiably not implemented.
Safety Cases are living documents, requiring update when major hazards, risk assessment conclusions, or the underlying safety management system change materially, rather than being produced once and left static for the life of the facility.