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Industry Suggested Approach to NTTF Rec. 4.2
Process to establish site conditions/external hazards (all units)Determine how to reasonably protect equipmentDevelop template for NRC endorsement– Site external hazards– Protection strategies
P i l– Programmatic controls– Implementation schedules
Stakeholder comment on draft orderNRC issue order and review submittalsIndustry implementation and NRC inspectionConducting other NTTF recommendations in parallel may require revisiting 4.2 at a later date
1
FLEX and Industry Goals
Generic Problem Statement
FLEX functionsFLEX functions
FLEX conceptual approach
Diverse & Flexible Mitigation Capability (FLEX)
Emergency Plans
SAMGs
Emergency Plans
Diverse & FlexibleEmergency
DRAFT
Protection
Mitigation
Design Basis External Events
SBO Coping Capability
SAMGs
Design Basis External Events
SBO Coping Capability
Increased Defense-in-
Depth
Diverse & Flexible Mitigation Strategy
(FLEX)
g yResponse
Current Current plus FLEX
FLEX Equipment ScopeDRAFT
Equipment & Structures: Portable and prestaged pumps
generators, batteries, compressors, hoses, couplings,tools, debris clearing equipment located in structures at
diverse locations to protect against external events per commercial standards,
Guidelines & Procedures including integration and coordination of severe accident management guidelines,
extensive damage mitigation guidelines
Safety Benefit – SECY 11-0137Collective Reduction -- Sequentially Applied
1.2 X
X
0 8 X
CurrentRisk
(Mean Values Only – Linear)
7
0.8 X
0.6 X
0.4 X
0.2 X
0 Current Rec. 4
Plus Rec. 2.1
Plus Rec. 5
Plus Rec. 7
Plus Rec. 8
Plus Rec. 9
All SECY11-37
Near -Term
All 90-dayRecs
Validated using BWR and PWR PRAs