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Graphite Qualification Methodology	Topical Report	ML22304A197	Withdrawn, but feedback was provided in ML23023A248 and ML23033A544.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	Under review
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