QEHSRisk
Safety Case
A structured argument, supported by evidence, that a system is acceptably safe.
Required for major hazard facilities in the UK (COMAH), Australia (MHF regulations), and offshore installations (Safety Case Regulations 2015). A safety case demonstrates that all major accident hazards have been identified and risks reduced ALARP (As Low As Reasonably Practicable). It is a living document, updated after significant changes. Differs from a PHA in that it makes a formal safety argument to the regulator.