Spotlight
Xe-100
Project Overview
The U.S. Nuclear Regulatory Commission (NRC) is currently engaged in pre-application activities with X Energy, LLC. (X-energy) starting in September 2018. X-energy is a Rockville, MD company designing the Xe-100 reactor which is a pebble-bed, high-temperature gas-cooled reactor (HTGR). Each reactor will generate 200MWt and approximately 80MWe. The standard Xe-100 "four-pack" plant generates approximately 320MWe.
For more information, please see the Xe-100 reactor pre-application documents (NRC Docket 99902071).
To subscribe to the X-energy Xe-100 email service, select X-Energy Xe-100 from the Advanced Reactors list after entering your email into the GovDelivery system.
Pre-Application Activities
Product | Type | Reference | Status |
|---|---|---|---|
Xe-100 U.S. Regulatory Engagement Plan (REP) 2023 Update | Regulatory Engagement Plan | No review requested | |
Quality Assurance Program Description, Revision 3 | Topical Report | Feedback Provided | |
Mechanistic Source Term Verification and Validation | White Paper | Feedback Provided | |
Reactor Pressure Vessel Construction Code Assessment for the Xe-100 Reactor | White Paper | Feedback Provided | |
Xe-100 Licensing White Paper: Use of Bounding Values | White Paper | Feedback provided | |
Licensing Application Content and Regulatory Analysis | White Paper | Feedback provided | |
TRISO-X Pebble Fuel Qualification Methodology | Topical Report | Feedback provided ML22327A199 | |
Maintenance Staff Optimization Approach | White Paper | Feedback provided | |
Physical Protection System Approach | White Paper | Feedback provided | |
Risk-Informed Performance-Based Licensing Basis: X-energy's Approach to NEI 18-04 Implementation | Topical Report | Feedback provided ML22308A197 | |
Transient and Safety Analysis Methodologies Framework | Topical Report | Feedback provided: ML23086C082 | |
Control Room Staffing Analysis Methodology | Topical Report | Feedback provided in ML23004A128 and ML23107A063. | |
Training Programs, Control Room Operator Qualification, and Control Room Operator Eligibility | White Paper | Feedback provided ML22294A105 | |
Graphite Qualification Methodology | Topical Report | Withdrawn, but feedback was provided in ML23023A248 and ML23033A544. | |
Xe-100 Principal Design Criteria | Topical Report | ML22195A260 (Revision 1) | |
Probabilistic Risk Assessment Technical Adequacy Approach | White Paper | Feedback provided: | |
Quality Assurance Program Description, Revision 4, supplemented by Quality Assurance Program Description, Revision 6 | Topical Report | Feedback provided | |
Xe-100 Training Program Methodology (Revision 2) | Topical Report | Withdrawn, but feedback was provided in ML23103A187. | |
Xe-100 Plant Control and Data Acquisition System | White Paper | Feedback provided ML23236A008 | |
Xe-100 Seismic Design Methodology | White Paper | Feedback provided ML23188A092 | |
Emergency Planning Approach and Regulatory Analysis | White Paper | Feedback provided | |
Atmospheric Dispersion and Dose Calculation Methodology | Topical Report | Feedback provided | |
GOTHIC and Flownex Analysis Codes Qualification | Topical Report | ML23275A201 (Revision 1) | Revision 1 – Withdrawn |
Training Programs Methodology | Topical Report | Under Review | |
Reactor Core Design Methods and Analysis | Topical Report | Under Review | |
Transient and Safety Analysis Methodology | Topical Report | Under Review | |
Mechanistic Source Term Approach | Topical Report | Under Review | |
Graphite Core Assembly Material Qualification and Design Methodologies | Topical Report | Under Review | |
Plume Exposure Pathway Emergency Planning Zone Sizing Methodology | Topical Report | Under Review |
Contacts
Contacts for the X-Energy Xe-100 Pre-Application Review | |
|---|---|
Lead Project Manager | |
Contact a Public Affairs Officer | |
Page Last Reviewed/Updated Thursday, December 11, 2025
Page Last Reviewed/Updated Thursday, December 11, 2025