Large-scale energy storage system: safety and risk assessment

Sustainable Energy Research

Table 18 Comparison of proposed EcS assessment parameters against reviewed risk assessment methods and recently developed STPA‐H method (Choo & Go, 2022)

Safety/risk assessment parameters				Safety and risk assessment method
Safety/risk assessment parameters	ETA	FTA	FMEA	HAZOP	STPA	LOPA	STPA‐H (Choo & Go, 2022)	EcS
System definition Design Parameter/elements guidewords	ETA ETA	FTA FTA	FMEA FMEA	HAZOP HAZOP			STPA‐H STPA‐H	EcS
Constraints					STPA		STPA‐H	EcS
Control structure					STPA		STPA‐H	EcS
Control actions					STPA		STPA‐H	EcS
Accident analysis Events Causes Consequences	ETA ETA ETA	FTA FTA	FMEA FMEA	HAZOP HAZOP HAZOP	STPA STPA	LOPA LOPA LOPA	STPA-H STPA‐H STPA‐H	EcS EcS EcS
Corrective action
Preventive measures		FTA	FMEA	HAZOP	STPA	LOPA	STPA‐H
Mitigation measures	ETA		FMEA	HAZOP	STPA	LOPA	STPA‐H	EcS
Action required				HAZOP	STPA		STPA‐H	EcS
Quantitative risk Analysis Probabilistic risk Ranking Failure probability	ETA ETA	FTA FTA	FMEA FMEA			LOPA LOPA	STPA‐H STPA‐H	EcS EcS
Component failure		FTA	FMEA			LOPA	STPA‐H	EcS
Safety barrier failure	ETA	FTA	FMEA			LOPA		EcS
Damage severity			FMEA					EcS

^aEcS Event-centric systems analysis included quantitative analysis of safety barrier failures and mitigation measures targeted at safety systems