Nuclear Thermal Propulsion NTP Overview Project Description Determine

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 Full Funding Profile (all years): • Budget vs. Requirements FY 16 FY 17 FY 18 Total Approved 5. 754 19. 200 20. 000* 44. 474 Required 5. 754 19. 200 20. 000* 44. 474 Delta 0. 000 *STMD Planning Number 1

NTP Issues / Top Accomplishments Progress according to plan; All commitments can be met Area of Concern; Needs Attention; Problem can be resolved within project/organization Project Status Cost Mgmt Schedule Status Technical Status Financial Status Based on Pv. A Variances Project Engr S&MA Obs Cost FTEs Significant Problem; Solution Not Identified; Needs action/help beyond project/organization Issues: • GCD milestone: Completion of 1 mg 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 FY 17 • Will evaluate results and path forward at the end of FY 17 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 Challenges with purified tungsten (W) work have resulted in elevating the risk to this task. 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 Schedule Completion of 1 mg 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 FY 17. September 30, 2017 3

NTP Risks 5 X 5 Criteria Definitions 4

NTP Summary Schedule 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 3 rd 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