Introduction

Safety Critical Elements (SCEs) are systems, equipment, or components whose failure could lead to, or significantly contribute to, a major accident event, or whose purpose is to prevent or mitigate such events.
SCE identification and management is a structured process used to ensure that all critical barriers – both preventive and mitigative – are clearly defined, maintained, and continuously monitored throughout the facility lifecycle.

Purpose

• Identify systems and components critical to preventing or mitigating major accident hazards
• Establish a clear linkage between hazards, barriers, and SCEs
• Define performance standards and functional requirements for each SCE
• Ensure the integrity, availability, and reliability of safety-critical systems
• Support regulatory compliance and safety case development
• Strengthen barrier management and operational safety

Outcomes

• Comprehensive SCE register linked to major accident hazards and barriers
• Defined performance standards (functionality, availability, reliability, survivability)
• Clear roles and responsibilities for SCE management and assurance
• Integration with maintenance and inspection strategies (e.g., assurance tasks, KPIs)
• Identification of gaps in barrier effectiveness and integrity
• Alignment with Bowtie Analysis and Safety Case requirements
• Recommendations to enhance barrier reliability and performance
• Structured SCE report and assurance framework ensuring audit readiness