ML26048A602
| ML26048A602 | |
| Person / Time | |
|---|---|
| Site: | 05000614 |
| Issue date: | 02/14/2026 |
| From: | NRC |
| To: | NRC/NRR/DANU |
| References | |
| Download: ML26048A602 (0) | |
Text
From:
ProjectLongMott-Safety Sent:
Saturday, February 14, 2026 3:11 PM To:
ProjectLongMott-SafPUBLICem Resource
Subject:
AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY Attachments:
AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY.pdf; AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY.pdf
Hearing Identifier:
XeDOW_ProjectLongMott_SafPublic Email Number:
398 Mail Envelope Properties (SJ0PR09MB9687BBE370B963BDF8F7C3E8BD6EA)
Subject:
AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY Sent Date:
2/14/2026 3:10:59 PM Received Date:
2/14/2026 3:11:01 PM From:
ProjectLongMott-Safety Created By:
ProjectLongMott-Safety.Resource@nrc.gov Recipients:
"ProjectLongMott-SafPUBLICem Resource" <ProjectLongMott-SafPUBLICem.Resource@nrc.gov>
Tracking Status: None Post Office:
SJ0PR09MB9687.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 3
2/14/2026 3:11:01 PM AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY.pdf 506773 AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY.pdf 133354 Options Priority:
Normal Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Enclosure X-ENERGY, LLC. - AUDIT PLAN FOR XE-100 TOPICAL REPORT: PLUME EXPOSURE PATHWAY EMERGENY PLANNING ZONE SIZING METHODOLOGY, REVISION 1 (CAC/EPID NO.: 000431/L-2024-TOP-0034)
APPLICANT INFORMATION Applicant:
X Energy, LLC Applicant Address:
530 Gaither Road, Suite 700, Rockville, MD 20850 Design Name:
Xe-100 Project No:
99902071
Background:
By letter dated November 26, 2024, X Energy, LLC., (X-energy) submitted Topical Report (TR) 010229, Xe-100 Licensing Topical Report Plume Exposure Pathway Emergency Planning Zone Sizing Methodology, Revision 1 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML24331A305). This TR describes the methodology to be used to establish the site-specific plume exposure pathway (PEP) emergency planning zone (EPZ) size for Xe-100 advanced reactor plants.
This audit is in support of the U.S. Nuclear Regulatory Commission (NRC) staffs safety review of the TR submitted by X-energy.
Purpose:
The purpose of the audit is for the NRC staff to gain a more detailed understanding of X--energys proposed methodology for determining PEP EPZ sizing, and to identify any information that will require docketing to support the NRC staffs safety evaluation of the subject TR, which is expected to be referenced in future licensing applications for X-energys Xe-100 reactor design. Therefore, the NRC staff is requesting access to X-energy documents associated with the development of this methodology as referenced in the TR.
Regulatory Audit Basis:
This regulatory audit focuses on the information contained in TR 010229, Xe-100 Licensing Topical Report Plume Exposure Pathway Emergency Planning Zone Sizing Methodology, Revision 1. The regulatory requirements applicable to this TR are as follows:
Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Domestic Licensing of Production and Utilization Facilities, provides regulations for licensing production and utilization facilities.
o Regulation 10 CFR 50.2, Definitions, provides definitions for Non-Light Water Reactor, Non-Power Production or Utilization Facility, and Small Modular Reactor.
o Regulation 10 CFR 50.33, Contents of applications; general information, provides requirements for applications for an operating license (OL) or construction permit (CP) under 10 CFR Part 50 or a Combined License (COL) or an Early Site Permit (ESP) under 10 CFR Part 52, Licenses, Certifications, and Approvals for Nuclear Power Plants, including EPZ requirements for applicants complying with 10 CFR 50.160, Emergency preparedness for small modular reactors, non-light-water reactors, and non-power production or utilization facilities.
o Regulation 10 CFR 50.47, Emergency plans, provides emergency planning requirements for nuclear power reactors.
o Regulation 10 CFR 50.54, Conditions of licenses, provides requirements for changing emergency plans.
o Regulation 10 CFR 50.160, Emergency preparedness for small modular reactors, non-light-water reactors, and non-power production or utilization facilities, provides alternative performance-based emergency planning requirements for small modular reactors (SMRs), non-light water reactors (non-LWRs), and non-power utilization facilities (NPUFs) applicant and licensee emergency planning programs.
Regulatory Audit Scope:
The audit will follow the guidance in Office of Nuclear Reactor Regulation (NRR) Office Instruction LIC-111 (ML19226A274), Regulatory Audits, and focus on information provided by X-energy through the electronic reading room (eRR), and, if necessary, onsite visits.
Information and Other Material Necessary for the Regulatory Audit:
The NRC staff requests that the following references from the TR be made available upon audit entrance:
Xe-100 Radiological Consequence Analysis - Preliminary Scope Report (Document No.: 006870)
Xe-100 Probabilistic Risk Assessment: Risk Integration - Preliminary Scoping (Document No.: 002200)
Additional material may be requested as needed.
Team Assignments:
Kristy Bucholtz Nuclear Engineer, Audit Technical Lead Ian Jung Senior Reliability and Risk Analyst Tim Drzewiecki Senior Reactor Systems Engineer Robert Roche-Rivera Senior Civil Engineer Inseok Baek Reactor Engineer Michelle Hart Senior Reactor Engineer Edward Robinson Senior Emergency Preparedness Specialist Kenneth Mott Emergency Preparedness Specialist Adrian Muniz Senior Project Manager Richard Rivera Project Manager Members of the audit team may change during the audit.
Logistics:
Entrance Meeting April 3, 2025 Exit Meeting Week of June 26, 2025 (estimate)
Audit meetings will take place in a virtual format, using Microsoft Teams or another similar platform. Audit meetings will be scheduled as needed after the entrance meeting. The audit will begin on April 3, 2025, and continue as necessary, with activities occurring intermittently during the audit period. The audit period may be reduced or extended, depending on the progress made by the NRC staff and X-energy in addressing audit questions.
Special Requests:
The NRC staff requests that X-energy subject matter experts are available to answer questions during the audit. The NRC staff also requests that X-energy provides access to supporting documents via the X-energy electronic reading room. X-energy should track the NRC staffs audit questions and make the responses available in the eRR.
In addition, if there is any information (e.g., revised markups to the TR) identified during the audit that will require docketing to support the NRC staffs safety evaluation, the NRC staff requests that X-energy make the draft information available in the eRR for discussion with the NRC staff before the information is formally docketed.
Deliverables:
At the completion of the audit, the NRC staff will issue an audit summary within 90 days after the exit meeting. The audit summary will be made publicly available in ADAMS.
References:
Title 10 of the Code of Federal Regulations.
If you have questions regarding this audit, please contact me at 301-415-7190 or via email at Richard.Rivera@nrc.gov, or Adrian Muniz at 301-415-4093 or via email at Adrian.Muniz@nrc.gov.
Sincerely, Richard Rivera, Project Manager Advanced Reactors Licensing Branch 2 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation Docket No.: 99902071 cc: X-energy Xe-100 via GovDelivery
ML25086A158 NRR-106 OFFICE NRR/DANU/UAL2:PM NRR/DANU/UAL2:PM NRR/DANU/UTB1:BC NAME RRivera AMuniz TTate DATE 03/25/2025 03/27/2025 03/25/2025 OFFICE NRR/DANU/UAL2:BC NRR/DANU/UAL2:BC(A)
NAME JSegala RRivera DATE 03/27/2025 03/27/2025
From:
Richard Rivera To:
ext_Jessica_Maddocks Cc:
Subject:
AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY Date:
Thursday, March 27, 2025 1:44:00 PM Attachments:
AUDIT PLAN FOR XE-100 LICENSING TOPICAL REPORT PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY.pdf image001.png
- Jessica, The NRC staff developed the regulatory audit plan for the technical review of X Energys Xe-100 Licensing Topical Report Plume Exposure Pathway Emergency Planning Zone Sizing Methodology. The audit plan is set to become publicly available in ADAMS on April 1, 2025.
Enclosed you will find a courtesy copy. Once the audit plan is publicly available, you may access the official copy via Web-Based ADAMS using accession number ML25086A158.
We will discuss this audit plan during the upcoming Audit Kick-Off meeting scheduled for Thursday, April 3, 2025. In the meantime, should you have any questions feel free to contact me at your earliest convenience.
- Regards, Richie Richard Rivera, MEM Project Manager U.S. Nuclear Regulatory Commission - HQ NRR/DANU/UAL2 Ph. 301-415-7190 E-mail Richard.Rivera@nrc.gov P Please consider the Environment before printing this e-mail.