Emergency System Survivability Analysis (ESSA)

The overall objective of the Emergency Systems Survivability Analysis (ESSA) is to identify all key emergency systems and ensure that these systems are suitable for the Major Accident Events they have been designed to respond to; and that the systems will survive for sufficient time to perform their design functions.

The objectives of the study were to:

• Identify the Emergency Systems that are required to operate in the event of hydrocarbon release/ ignition events;
• Identify emergency events (fire/ explosions) emergency conditions that require ESSA;
• Review the survivability of the Emergency Systems under the given emergency conditions by assessing their criticality and vulnerability to the consequences of the evens they are intended to mitigate; and
• Identify any design inadequacies and propose recommendations for remedial action and thus assist in the demonstration of ALARP.

Using the results of the Fire and Explosion Risk Analysis (FERA), Escape, Evacuation, and Rescue Analysis (EERA) and Smoke and Gas Dispersion Analysis (SGDA), the hazardous events affecting the emergency systems are identified.