ML25330A076
| ML25330A076 | |
| Person / Time | |
|---|---|
| Site: | 99902049 |
| Issue date: | 11/26/2025 |
| From: | Holtec, SMR |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML25330A074 | List: |
| References | |
| 300-USNRC-121 | |
| Download: ML25330A076 (0) | |
Text
holtec.com l smrllc.com SMR-300 I&C Architecture Topical Report Overview Open Portion December 9, 2025 Holtecs SMR-300 Technology Safe, Secure, Reliable, Flexible, Economical Clean Energy to Support the Worlds Energy Needs
[Not Export Controlled]
holtec.com l smrllc.com l Page 2 Purpose of Meeting SMR-300 I&C Architecture Background Topical Report Scope and Objective Proposed Schedule Q&A Closed Proprietary Portion Agenda
holtec.com l smrllc.com l Page 3 D3 Diversity and Defense-in-Depth DAS Diverse Actuation System DBE Design Basis Event DSRS Design-Specific Review Standard I&C Instrumentation and Control MELCO Mitsubishi Electric Corporation MELTAC Mitsubishi Electric Total Advanced Control PCS Plant Control System PSS Plant Safety System SE Safety Evaluation LTR Topical Report Acronyms
holtec.com l smrllc.com l Page 4 To provide a walkthrough of LTR scope and objectives, including:
Specific scope of the LTR How the LTR is used in conjunction with the MELTAC Platform LTR How the LTR will be used in future licensing submittals Alignment on LTR submittal and review timeline Purpose of Meeting
holtec.com l smrllc.com l Page 5 Previous pre-application regulatory engagements include:
I&C Hazard Analysis Methodology, Feb 2023 ML23019A004 I&C D3 Evaluations, July 2023 ML23156A182 I&C ISG-04 Conformance Analysis, Aug 2023 ML23289A099 I&C Two Division Design Conformance to IEEE Std 603, Sept 2023 ML23296A001 SMR-300 Cyber Security Strategy, Aug 2024 ML24262A002 SMR-300 I&C Architecture Licensing Topical Report Kickoff ML25233A293 SMR-300 I&C Architecture Background
holtec.com l smrllc.com l Page 6 The SMR-300 I&C systems are based on digital platforms developed by MELCO.
MELCO received a SE for Revision 2 of the MELTAC Platform LTR in 2018 (ML18260A211).
MELCO is expected to receive a SE for Revision 3 of the MELTAC Platform LTR in the next couple months (ML23167C168).
MELTAC Platform LTR covers the platform design and not the application use case for the SMR-300.
SMR-300 I&C Architecture Background
holtec.com l smrllc.com l Page 7 SMR-300 is following 10 CFR Part 50.
DNRL-ISG-2022-01 Appendix A provides guidance for I&C content related to Part 50 construction permit applications.
The SMR-300 I&C design follows the guidance in DSRS Chapter 7.
Unified framework that emphasizes fundamental I&C design principles:
Independence Redundancy Predictability and Repeatability Diversity and Defense-in-Depth Generic for I&C, focused on digital I&C systems Applicable Regulatory Guidance and Licensing Strategy
holtec.com l smrllc.com l Page 8 The SMR-300 I&C Architecture LTR builds on the MELTAC Platform LTR.
Platform LTR covers topics that can be addressed at a platform level.
e.g., design of the communications networks Architecture LTR describes how the platform is applied to SMR-300.
Not duplicating or restating design concepts from the Platform LTR Addresses some application-specific action items Not all Platform LTR plant-specific action items are being addressed or closed in this LTR Topical Report Scope and Objective
holtec.com l smrllc.com l Page 9 The SMR-300 I&C Architecture LTR describes the architecture design and configuration of the SMR-300 I&C systems.
The LTR demonstrates that the SMR-300 I&C architecture adheres to the fundamental design principles and supports acceptable communications between safety-related and non-safety-related systems.
The objective of the LTR is to obtain an SE from the NRC concluding that the SMR-300 I&C architecture design is acceptable for reference in future SMR-300 licensing applications.
Topical Report Scope and Objective
holtec.com l smrllc.com l Page 10 Proposed timeline for review Submittal December 2025 Requesting a 12-month review cycle Proposed Schedule
holtec.com l smrllc.com l Page 11 Questions?
www.holtec.com l Page 12 Thank You Krishna P. Singh Technology Campus 1 Holtec Boulevard, Camden, NJ 08104 Tel: (856) 797-0900 l www.holtec.com holtec.com l smrllc.com l Page 12