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

Integrated, Diverse & Flexible Mitigation Capability (FLEX)

December 8, 2011

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

Tier 1 FLEX Approach

DRAFT

5

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