FMR
US
Basics
Reactor Type
Gas Cooled Reactor
Gas cooled reactor
Primary heat transport: mostly CO2 or helium gas
Primary heat transport: mostly CO2 or helium gas
Reactor Description
Fast high temperature pellet GCR
Electric Output (MWe)
50
Thermal Output (MWt)
100
Size
Small
'Small' size
Electric output of between 10 MWe and 100 MWe
Electric output of between 10 MWe and 100 MWe
Spectrum
Fast
Kinetic neutron energy of 1…20 Mev
Kinetic energy of a not-moderated particle (neutron spectrum)
Kinetic energy of a not-moderated particle (neutron spectrum)
Developer
General Atomics
Pilot Site Details
N/A
Details
Use (goal of commercial operation)
baseload electricity generation
Deployment medium
Land-based
Design Lifetime (Years)
60
Fuel
Fuel class
HALEU
High-assay low enriched uranium
Uranium enriched to 5…20 percent U-235
Uranium enriched to 5…20 percent U-235
Fuel Type
UO2 Pellets
Uranium dioxide
Most often used uranium compound for fuel elements
Most often used uranium compound for fuel elements
Fuel Cycle
Once-Through
Refuelling Cycle
180 Months
Cooling & Temperature
Reactor cooling of primary loop
Helium
Reactor moderator
None
Reactor Outlet Temperature (°C)
800
Status
Design status
Conceptual design
Licensing status
- 2027: Target start of pre-licensing...
- 2027: Target start of pre-licensing design review in US
- 2029: Target completion of engineering design and securing necessary licenses in US
Deployment timeline
- Nov 2025: Reported completion of...
- Nov 2025: Reported completion of conceptual design
- 2030: Start construction of a demonstration unit in US
- 2036: Commercial operation
Agreements and Engagement
Oct 2020: Cooperation signed with Framatome
