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What are Microreactors?
Microreactors are a class of very small modular reactors targeted for non-conventional nuclear markets. The US Department of Energy supports a variety of advanced reactor designs, including gas, liquid-metal, molten-salt, and heat-pipe-cooled concepts. In the U.S., microreactor d​evelopers are currently focused on designs that could be deployed as early as the mid-2020s. 

Potential Microreactor applications are:
  • ​Remote communities
  • Mining sites
  • Remote defense bases
  • Applications such as back-up generation for power plants
  • Humanitarian assistance and disaster r​​elief missions
Such applications currently face economic and energy security challenges that can be uniquely addressed by this new class of innovative nuclear reactors.

Key Attributes​

Microreactors have key features enabled by their small size that distinguish them from other reactor types mainly large reactors (LWRs) and small modular reactors (SMRs). 

These are:​ 
  • Typically produce less than 20 MWth
  • ​Smaller footprint​
  • Factory fabrication​​​​
  • Transportable
  • Self-regulating (enabling remote and semi-autonomous microreactor operation) 
  • Rapid deploy-ability a​nd availability during emergency response
  • Possible operation up to 10 years or more​

What are National Laboratories Doing?
The U.S. Department of Energy (DOE) Microreactor Program was established to support research and development (R&D) of technologies related to the development, demonstration and deployment of very small, transportable reactors to provide power and heat for decentralized generation in civilian, industrial and defense energy sectors.

Led by Idaho National Laboratory (INL), the program conducts both fundamental and applied R&D to reduce the risks associated with new technology performance and manufacturing readiness of microreactors. The intent of the program is to ensure that microreactor concepts can be licensed and deployed by commercial entities to meet specific use case requirements. The program will also support R&D specific to certain reactor technologies to ensure relevancy and address the needs of commercial developers.

Who is partnering with the National Laboratories?
​The U.S. DOE Microreactor Program collaborates and interfaces with other DOE programs and activities to advance its mission to support development and deployment of microreactor concepts. DOE has several programs covering a range of technologies relevant to microreactor development. The program will engage with these programs through the DOE Office of Nuclear Energy planning process, coordination meetings, and review and planning meetings to ensure that scope is aligned and not duplicative.

Associated Programs
​​Advanced Reactor Technology (ART) Program​​
Advanced Research Projects Agency - Energy (ARP​A-E)
Gateway for Accelerated Innovation in Nuclear (GAIN)
National Reactor Innovation Center (NRIC)
Nuclear Energy Enabling Technologies (NEET) Programs
Nuclear Energy University Program (NEUP)
Transformational Challenge Reactor (TCR)

U.S. DOE Program Manager
Diana Li ​
Office: (301) 903-1503​​​​​

National Technical Director
John Jackson
Office: (208) 526-0293
Technical Area Leads
​​​​System Integration & ​Analyses
Alexander Huning​
Fusion and Fission Energy 
Sciences Directorate
Oak Ridge National Laboratory
Office: (865) 574-7368
Demonstration Support Capabilities
Piyush Sabharwall
Nuclear Science & Technology
Idaho National Laboratory
Office: (208) 526-6494

​​​Technology Maturation
Holly Trellue
Nuclear Engineering & Nonproliferation Division
Los Alamos National Laboratory
Office: (505) 665-9539
Microreactor Application
John Jackson
Nuclear Science & Technology
Idaho National Laboratory
Office: (208) 526-0293

Information Sheets
The U.S. DOE Microreactor Program
Microreactor Applications Research Validation and Evaluation Project (MARVEL)​
Microreactor Agile Non-nuclear Experimental Testbed (MAGNET)​
Single Primary Heat Extraction and Removal Emulator (SPHERE)​​​​​

Program Plans
Program Plan​​ 
Operations Plan​​ 

Organizational Structure
Org Structure 

Technical Reports​
Technical Reports
Microreactor Program: Experimental Capabilities

Journal Articles​
Nuclear Technology Special Issue​

Verification and Validation (Experimental Results)
​ Experimental Database​
  • MAGNET (will be available soon)​
In The News
Puerto​ Rico work to update grid, make territory more energy independent
An affordable zero emissions grid needs new nuclear
Microreactors Flipboard

March 5-6, 2024​​​​​​
Microreactor Program Review​​
In-Person Location: Idaho National Laboratory, Engineering Research Office Building (EROB), 2525 Fremont Ave, Idaho Falls, ID
Conference Room 159B
Day 1 - Virtual Meeting Link
Day 2 - Virtual Mee​ting Link​​

March 7, 2024
MARVEL Technology Review
In-Person Location: Idaho National Laboratory, Engineering Research Office Building (EROB), 2525 Fremont Ave, Idaho Falls, ID
Conference Room 159B
Virtual Meeting Li​nk​​
Past Meetin​​gs and Workshops

March 8-9, 2023: Microreactor Program Winter Review
October 19-20, 2022: Microreactor Applications Research Validation and Evaluation Project (MARVEL)
March 3-4, 2022: Microreactor Program Winter Review

Participating National Laboratories​
Argonne National Laboratory
Idaho National Laboratory
Los Alamos National Laboratory
Oak Ridge National Laboratory
Pacific Northwest National Laboratory
Sandia National Laboratory

Participating Univ​ersities
Through Nuclear Energy University Program)

Auburn University
University of Illinois
Massachusetts Institute of Technology
University of Michigan
​​​​Texas A&M University