Grid-scale Energy Storage Hazard Analysis Design Objectives for System Safety

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Design Objectives
Note: These design objectives overlap with each other or provide alternative methods to enforce the same safety constraint. The following list illustrates the overlapping structure of these design objectives:
◦ Safetycriticalinformationavailabilitytofirefighters
◦ Design objective 1.1 and/or,
◦ Design objective 1.2
◦ Safetyoffirefighterintervention
◦ Design objective 1.3
◦ Thermal runaway prorogation resistance ◦ Passive design or,
◦ Runaway does not violate safe temperature limits in other cells (more stringent)
◦ Design objective 2.1 (cell-to-cell) and/or,
◦ Design objective 2.3 (module-to- module)
◦ Runawaydoesnotinitiateself-heatinginothercells(lessstringent)
◦ Design objective 2.2 (cell-to-cell) and/or,
◦ Design objective 2.4 (module-to- module)
◦ Active design
◦ Runawaydoesnotviolatesafetemperaturelimitsinothercells(morestringent)
◦ Design objective 2.1-Active (cell-to-cell) and/or,
◦ Design objective 2.3-Active (module-to- module)
◦ Runawaydoesnotinitiateself-heatinginothercells(lessstringent)
◦ Design objective 2.2-Active (cell-to-cell) and/or,
◦ Design objective 2.4-Active (module-to- module)
− External fire prevention/suppression ▪ Design objective 2.5 and,
▪ Design objective 2.6
− Explosion prevention
▪ Design objective 3.1 (passive ventilation) or,
▪ Design objective 3.2 (active ventilation)
− Explosion protection
▪ Design objective 3.3
− Automated response to a fire and/or power outage
▪ Design objective 4.1 and,
− Design objective 4.2 (subject to 4.1)
▪ Design objective 4.3
− Regular maintenance and ground fault management
▪ Design objective 4.4
− Data integrity and accuracy
▪ Design objective 5.1