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4.2 Mitigation Strategy for Beyond-DBE
- Three phase approach required for mitigating beyond-DBE
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The initial phase: use of installed equipment and resources
- The transition phase: portable, onsite equipment and consumables
- The final phase: offsite resources to sustain those functions indefinitely
US-ABWR Design
Even w/o CTG, three safety functions are sustained for more than 72 hr
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Core Cooling for the initial 8 Hours: RCIC with DC batteries
- Core Cooling after RCIC termination: ACIWA/RHR with FPS pump
- SFP cooling: ACIWA/RHR with FPS pump
External hookup of portable pump
Containment: passive containment hardened vent
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