Nuclear Thermal Propulsion Feasibility Project Overview

Nuclear Thermal Propulsion (NTP) Overview Project Description: Determine Low Enriched Uranium (LEU) NTP feasibility and affordability, with good cost and schedule confidence, prior to a decision to proceed with full scale development. Demonstrate the technology that enables the development of higher temperature, minimum erosion/fission product release fuel elements using LEU. Leverages government, industry and academic expertise. Roles and Responsibilities MSFC: PM, SE, Cost Lead, Cryo CONOPS Lead GRC: System Analysis and Support, Cryo CONOPS Support SSC: Subscale Exhaust Capture Demo, Ground Test Support KSC: Ground Processing Conops/Cost Dynetics: Demonstration of Purified Tungsten Aerojet Rocketdyne: LEU Engine Feasibility/Cost BWXT: Fuel/Reactor Design/Fabrication/Cost DOE: Fuel/Reactor Design and Fabrication Support FY16 FY17 FY18 Total Full Funding Profile (all years): Budget vs. Requirements Approved 5.754 19.200 20.000* 44.474 Required 5.754 19.200 20.000* 44.474 Delta 0.000 0.000 0.000 0.000 *STMD Planning Number 1

NTP Issues / Top Accomplishments Project Status Cost Schedule Status Technical Status Financial Status Based on PvA Variances Progress according to plan; All commitments can be met Area of Concern; Needs Attention; Problem can be resolved within project/organization Mgmt Project Engr S&MA Project Engr S&MA Obs Cost FTEs Significant Problem; Solution Not Identified; Needs action/help beyond project/organization Issues: GCD milestone: Completion of 1mg W-184 @ 50% has slipped from 5/15/17 (due date with margin) Revised date is TBD Received STMD approval on 6/9/17 to continue to execute purification task through FY17 Will evaluate results and path forward at the end of FY17 Accomplishments / Significance: Held NTP TIM @ Oak Ridge National Laboratory, (ORNL), 5/24-25/17 Reviewed analysis, assumptions and test approach Completed Project Technical Status Briefing for STMD and GCD, 6/7/17 Presented: 1) Positive results of NTP low enriched uranium (LEU) engine feasibility analysis; 2) Successful fabrication of cermet surrogate fuel element for testing in the Compact Fuel Element Environmental Tester (CFEET) Completed Evaluations of BWXT Proposal for additional Fuel/Reactor Design work PR is ready - awaiting final contract approval Estimate approval by 6/30/17 2

NTP Yellow and Red Elements Element Explanation of why Element is red or yellow What it will take to get to green (and to yellow for red risks) When you expect to get to Green Technical Continue to monitor the purification process and analysis verifying that the process is feasible. Have identified and actively investigating mitigation options that could be implemented including alternative LEU Cermet FE formulation that reduces or possibly eliminates reliance on purified W. September 30, 2017 Challenges with purified tungsten (W) work have resulted in elevating the risk to this task. Schedule Completion of 1mg W-184 @ 50% slipped from 4/14/17 (working due date) and beyond 5/15/17 (due date with margin) Completion of the milestone in FY17. September 30, 2017 3

NTP Risks 1 LxC Trend Rank From/To Risk ID No. 5 Approach - Risk Title 1 1 M- NTP-GCD-1 Tungsten Purification G Y R R R 2 4 2 2 R- FY18 Budget NTP-GCD-9 3 3 M- LEU Cermet Engine Feasibility NTP-GCD-4 G Y Y R R 3 4 4 M- Cermet Fuel Element (FE) Fabrication NTP-GCD-2 G Y Y Y R 5 5 M- Nuclear Indemnification NTP-GCD-6 2 4 3 G G G Y Y 5 1 G G G G Y 1 2 3 4 5 C o n s e q u e n c e s Criticality Current 3 2 30 Days Ago 0 0 2 60 Days Ago 0 0 3 2 90 Days Ago 0 0 1 4 Current 30 Days Ago 60 Days Ago 90 Days Ago 0 1 0 0 1 0 H,M,L H,M,L 1 2 1 2 1 High 5 5 6 6 Open Open 4 0 0 0 Med 0 (4) 1 (4) 0 (3) 3 (3) Closed (Total) 0 (0) 0 (0) 0 (0) 0 (0) Closed (Total) Low 0 New 4 New 5 X 5 Criteria Definitions 4

NTP Summary Schedule NTP NTP NTP FY16 FY17 FY18 Status: 6/15/17 Status: 6/15/17 Status: 6/15/17 J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O End of Year Rev. Mid-Year Closeout & Transition Rev. GCD Program Milestones ATP Mid-Year Rev. End of Year Rev. Mid-Year Rev. Rev. Qtrly Rev. Qtrly Rev. Qtrly Rev. Qtrly Rev. Qtrly Rev. Qtrly Rev. Continuation Review Continuation Review Kick-off @ MSFC Technical Update for GCD/STMD Project Milestones PTR-1 PTR-2 PTR-3 Project Analysis Fuel Reactor Analysis Annual Task Report Annual Task Report Annual Task Report Low Enriched Uranium (LEU) Engine Analysis Engine Architecture Review @ MSFC Task Kick-off Engine Performance & Feasibility Analysis Engine Archi. Recommendation & Rationale Complete LEU Cost Analysis Initial LEU NTP Sys Cost Analysis Rpt Final LEU NTP Sys Cost Analysis Qtrlt Cost Rev. Qrtly Cost Rev. Updated Sys Cost Analysis ( Purified W Cost Est.) Ground Test Approach/Demo. Analysis Annual Task Report Annual Task Report Annual Task Report Technology Development Deliver 1kg Purified W @ 90% Demonstration of Purified Tungsten (W) Deliver 1mg Purified W @ 50% TBD Deliver 50mg Purified W to 70% or Greater TBD CERMET DU FE for Testing in NTREES CERMET Fuel Element (FE) Cermet Surrogate FE For Testing in CFEET/NTREES Validation and Fuel Element Test NTP Project Cermet DU FE Tested @ 2850K in NTREES CFEET & NTREES Facility & Testing CERMET Surrogate FE Test in CFEET - Projct KPP - Projct KPP - Project KPP Complete - Project KPP Complete - Slip - Slip - GCD Controlled Milestone - GCD Controlled Milestone - GCD Controlled Milestone Complete - GCD Controlled Milestone Complete - Early Finish - Early Finish - Project Milestone - Project Milestone - Project Milestone Complete - Project Milestone Complete 5

NTP Financial/Workforce Status Chart Issues/Variance Explanations: No issues Significate funds obligated Anticipate additional funds will obligate and cost within the next couple of months FTE Coordinated with engineering to reduce charges in the next few months in those areas not effecting project milestones 6

NTP Upcoming Events / Key Milestones Deliver 1.0 mg of tungsten purified to 50 percent, 4/14/17, TBD Technical Interchange Meeting at SSC, 6/26-28/17 GCD 3rd Quarter Review, 7/18-19/17 NTP Technical Cost Review, 8/8/17 NTP Periodic Technical Review (PTR), 8/9/17 Cermet surrogate fuel element test in CFEET, 9/1/17 (GCD Milestone) Updated LEU NTP cost analysis, 9/1/17 (GCD Milestone) GCD NTP Continuation Review, 9/28/17 (placeholder) 7

Backup 8

NTP Engine Trade Tree 9

NTP GCD Technology Maturation Decision Logic 10

NTP GCD Technology Maturation Decision Logic (Continued) 11