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 | ML24054A840 | No review requested |
| Quality Assurance Program Description, Revision 3 | Topical Report | ML20343A088 | Feedback Provided ML20233A910 ML20351A428 |
| Mechanistic Source Term Verification and Validation | White Paper | ML19283B524 | Feedback Provided ML20069C346 |
| Reactor Pressure Vessel Construction Code Assessment for the Xe-100 Reactor | White Paper | ML20202A598 | Feedback Provided ML21166A304 |
| Xe-100 Licensing White Paper: Use of Bounding Values | White Paper | ML21295A296 | Feedback provided ML21323A159 |
| Licensing Application Content and Regulatory Analysis | White Paper | ML21120A338 | Feedback provided ML21271A629 |
| TRISO-X Pebble Fuel Qualification Methodology | Topical Report | ML21246A289 | Feedback provided ML22327A199 |
| Maintenance Staff Optimization Approach | White Paper | ML21362A751 | Feedback provided ML22095A057 |
| Physical Protection System Approach | White Paper | ML22098A228 | Feedback provided ML22269A562 |
| Risk-Informed Performance-Based Licensing Basis: X-energy's Approach to NEI 18-04 Implementation | Topical Report | ML22187A279 | Feedback provided ML22308A197 ML22340A564 |
| Transient and Safety Analysis Methodologies Framework | Topical Report | ML21288A173 | Feedback provided: ML23086C082 |
| Control Room Staffing Analysis Methodology | Topical Report | ML22004A333 | Feedback provided in ML23004A128 and ML23107A063. |
| Training Programs, Control Room Operator Qualification, and Control Room Operator Eligibility | White Paper | ML22153A201 | Feedback provided ML22294A105 |
| Graphite Qualification Methodology | Topical Report | ML22304A197 | Withdrawn, but feedback was provided in ML23023A248 and ML23033A544. |
| Xe-100 Principal Design Criteria | Topical Report | ML22195A260 (Revision 1) ML23181A172 (Revision 2) ML24047A308 (Revision 3) |
Feedback provided |
| Probabilistic Risk Assessment Technical Adequacy Approach | White Paper | ML22318A236 | Feedback provided: ML23097A124 |
| Quality Assurance Program Description, Revision 4, supplemented by Quality Assurance Program Description, Revision 6 | Topical Report | ML22230D075 ML23256A159 |
Feedback provided ML24218A128 |
| Xe-100 Training Program Methodology (Revision 2) | Topical Report | ML22364A278 | Withdrawn, but feedback was provided in ML23103A187. |
| Xe-100 Plant Control and Data Acquisition System | White Paper | ML23048A309 | Feedback provided ML23236A008 |
| Xe-100 Seismic Design Methodology | White Paper | ML23044A310 | Feedback provided ML23188A092 |
| Emergency Planning Approach and Regulatory Analysis | White Paper | ML23240A744 | Feedback provided ML23324A106 |
| Atmospheric Dispersion and Dose Calculation Methodology | Topical Report | ML23268A454 | Feedback provided ML24242A251 |
| GOTHIC and Flownex Analysis Codes Qualification | Topical Report | ML23275A201 (Revision 1) ML24143A192 (Revision 2) |
Revision 1 – Withdrawn Revision 2 – Under Review |
| Training Programs Methodology | Topical Report | ML24089A243 | Under Review |
| Reactor Core Design Methods and Analysis | Topical Report | ML24099A183 | Under Review |
| Transient and Safety Analysis Methodology | Topical Report | ML24121A285 | Under Review |
| Mechanistic Source Term Approach | Topical Report | ML24131A146 | Under Review |
| Graphite Core Assembly Material Qualification and Design Methodologies | Topical Report | ML24306A125 | Under Review |
| Plume Exposure Pathway Emergency Planning Zone Sizing Methodology | Topical Report | ML24331A305 | Under Review |
Page Last Reviewed/Updated Wednesday, March 19, 2025
Page Last Reviewed/Updated Wednesday, March 19, 2025