Emergency System Survivability Analysis (ESSA)

Emergency System Survivability Analysis (ESSA) evaluates whether safety-critical systems can perform their intended functions during and after major accident events, ensuring protection, control, communication, and evacuation capabilities are maintained until all personnel are safe. ESSA is vital for demonstrating functional integrity under fire, explosion, smoke, and other extreme conditions, supporting regulatory compliance and risk reduction.

Service information

Identify safety-critical functions and supporting systems essential for personnel protection and safe shutdown
Calculate exposure of systems to fire, explosion overpressure, smoke ingress, heat radiation and structural impacts
Assess system redundancy, physical segregation, passive and active protection measures, and dependency on support systems (e.g., power, HVAC, communications)
Quantify survivability duration and performance against applicable standards
Integrate ESSA findings with Quantitative Risk Assessment (QRA) and ALARP demonstrations
Provide pragmatic upgrade, retrofit, or design improvement strategies to close identified gaps and align with ALARP principles

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