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Title page 1

Contents 3

Highlights 2

Letter 5

Background 9

Approaches to Inertial Confinement Fusion and Overview of NNSA's Facilities 9

Key Roles and Responsibilities for ICF Program, Part of NNSA's Office of Defense Programs 16

NNSA's Plan Contained Sufficient Information on Activities to Sustain Capabilities in the Near-Term, and Plans for Mid-term Facility Upgrades Have Evolved 17

Plan Contained Sufficient Information for Decision-Makers on the Scope, Costs, and Time Frames to Sustain Capabilities 17

Plans for Mid-term Facility Upgrades Have Evolved 24

Near-Term Sustainment Activities Are Ongoing but NNSA Has Not Evaluated Progress Against a Baseline 27

NNSA Tracks Progress of Ongoing Sustainment Activities 27

NNSA Has Not Evaluated Facility Progress Against Near-Term Sustainment Scope, Cost, and Time Frame Baselines 29

Conclusions 31

Recommendations for Executive Action 32

Agency Comments 32

Appendix I: Comments from the Department of Energy 35

Appendix II: GAO Contact and Staff Acknowledgments 37

Tables 3

Table 1. Number and Estimated Cost of Sustainment Activities Outlined in the 2023 Recapitalization Plan for the National Nuclear Security Administration's... 18

Figures 3

Figure 1. Layout, Key Components, and Technology at National Ignition Facility, Lawrence Livermore National Laboratory 11

Figure 2. Layout, Key Components, and Technology at Omega Laser Facility, University of Rochester Laboratory for Laser Energetics 13

Figure 3. Layout, Key Components, and Technology at Z Pulsed Power Facility, Sandia National Laboratories 15

Figure 4. Photo of National Ignition Facility Laser Amplifier, Lawrence Livermore National Laboratory 20

Figure 5. Photo of Omega Laser Facility Target Viewing System, University of Rochester Laboratory for Laser Energetics 22

Figure 6. Photo of the Marx Bank Capacitors at Z Pulsed Power Facility, Sandia National Laboratories 23