The primary objective of ESSA is to evaluate the vulnerability of safety systems to specific MAH scenarios. This assessment requires a deep understanding of the design and functionality of these systems. The following steps are involved in the analysis:
1. Review of Safety Systems
Each safety system is thoroughly reviewed to identify any vulnerabilities in its ability to activate successfully during an MAH. This review takes into account the specific scenarios in which the system may be compromised.
2. Evaluation of Fail-safe Mechanism
The term “fail safe” refers to a system that will revert to its “safe” mode where it will perform its required safe function automatically upon failure of a “vulnerable” emergency system component. The impact of MAH on the ability for the system to move to its fail-safe mode is assessed. Furthermore, once it has reached its fail-safe mode, its ability to continue to perform its required function is also evaluated.
3. Evaluation of Redundancy
In cases where vulnerabilities are identified, the redundancy of the system is also evaluated. Redundancy is defined as the duplication of equipment within an emergency system ensuring that impairment of a single component would not result in a loss of system functionality. This involves assessing whether there are sufficient backup mechanisms in place to ensure the system can still provide the intended level of protection.
4. Assessment of Diversity
If there is insufficient redundancy, the analysis explores the potential for diversity within the system. This involves considering alternative approaches or components that could enhance the system’s ability to withstand and respond to MAH.
Importance of ESSA
By conducting ESSA, companies can identify potential weaknesses in their safety systems and take appropriate measures to mitigate risks. This proactive approach enhances the reliability and effectiveness of emergency response procedures, ultimately ensuring the safety of personnel and minimizing the impact of MAH.
