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M250410: Slides - Micro-reactors: Current Status and Moving Forward (Shoedel)
	ML25094A039
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Issue date:	04/04/2025
From:	; NRC/OCM
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ML25064A536	List: ML25086A178; ML25094A036; ML25094A037; ML25094A038; ML25094A039; ML25094A040; ML25097A070; ML25104A260;
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	M250410
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eVinci Microreactor NRC Commission Briefing Microreactors: Current Status and Moving Forward April 10, 2025 eVinci is a trademark of Westinghouse Electric Company LLC, its affiliates and/or its subsidiaries in the United States of America and may be registered in other countries throughout the world. All rights reserved..

Unauthorized use is strictly prohibited. Other names may be trademarks of their respective owners.

2 eVinci Microreactor Shut Down Rod Primary Heat Exchanger Heat Pipes TRISO Fuel Graphite Core Block Control Drum The eVinci Microreactor Advantage l 5MWe Electrical Power (1)

TRi-structural ISOtropic particle fuel (2)

High Assay Low Enriched Uranium

No water or lubrication required for operation

Low pressure systems

No active cooling

Fault-tolerant

Reduced instrumentation

Simplified maintenance

& operation

Black start capable

Connect to grid or operate in island mode

Transportable thus no fuel handling needed on site Technical Description Heat pipe cooled microreactor utilizing open air Brayton power conversion system producing 5 MWe over an 8-year fuel cycle Packaged Modules Reactor & Primary HX Module Power Conversion Unit Instruments and Controls Package Power Electronics Package Load following/black start battery Physical Security Central Station Capacity 5 MWe@4160V with ~7MWt @ 350F waste heat Capacity Factor 99%

Fuel (% U235)

TRISO(1) in a Graphite Compact, HALEU (19.75% U235)(2)

Cooling Method Passive Heat Pipes with Sodium Working Fluid Shutdown Features Control drums with independent passive shutdown Shutdown rods Passive core cooling without actuation - natural convection Reactor Pressure

~1 atm Neutron Moderator Graphite Refueling Cycle 8 years - based on full power operation Operations Staff 0 - 2 Operators

+1 on-call 24/7 Footprint Site: <3 acres Reactor Building: 0.4 acres Nuclear Concrete Basemat: 200 sq ft Westinghouse Non-Proprietary Class 3 l © 2025 Westinghouse Electric Company LLC, All Rights Reserved Technology Capabilities

Preapplication Engagement Experience Significant value in pre-application engagement with NRC to-date NRC feedback has been timely and beneficial Feedback on our 31 white papers supports resolution of key regulatory challenges early in the design and development process Regulatory certainty through Topical Report Safety Evaluations is key to efficient future license reviews Nuclear Test Reactor (NTR) demonstration in Idaho National Lab DOME Supports Future Commercial Licensing 3

EVinci l NRC.gov

4 Shut Down Rod Control Drum Mechanisms TRISO Fuel Compact Control Drum Body Primary Heat Exchanger Canister Heat Pipe Core Block Fiber Optics & Neutron Detectors Design to Manufacturing Westinghouse Non-Proprietary Class 3

Enabling Efficient Microreactor Licensing for High-Volume Deployment Fuel load in factory without operating license or combined license Transportation of fueled factory-fabricated reactor modules Reactor Assembly and Transportation Continuity of Operations Right-sizing staffing levels (including operations and security) commensurate with the size, simplicity, and reduced risk associated with microreactors Licensing of replacement reactor modules Ability to receive operated modules under Part 70 license to defuel and refurbish Storage of fuel after irradiation including potential redefinition of spent fuel eVinci Microreactor Deployment Model Disposal and Decommissioning Assemble in Factory Transport to Site Install and Operate On Site Reactor Refuel / Refurbish Nuclear Repository Storage Materials Decontamination Disposal Depleted Reactor and Irradiated Materials Transported Away from Site Safe, Reliable, Affordable

ML25094A039

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