Table of Contents
Gas-cooled fast reactor (GFR)
What's so interesting about them?
Gas-cooled fast reactors (GFRs) use the fast neutron spectrum and helium for cooling at high temperatures, serving purposes like power generation and hydrogen production. Overcoming challenges in fuel performance is a key focus. GFRs employ a multi-step process for electricity generation, utilising helium in various circuits.
Fuel
Fuel
Moderator
Moderator
Coolant
Coolant
Typical technical data:
| Neutron Spectrum | Outlet Temperature (Degrees Celsius) | Fuel Cycle | Net Electrical Energy Generation seen in Development (MW) |
|---|---|---|---|
|
Fast |
850 |
Closed |
1,200 |
What is happening with them today?
The concept dates back to the 1970s, with General Atomics leading design efforts. Despite no GFRs being built, a 75 MWth experimental GFR, Allegro, is in development by Euratom.
An alternative GFR design by General Atomics uses lower-temperature helium and supercritical CO2 for power generation, addressing challenges associated with extremely high temperatures. Collaborations with partners introduce innovative reactor designs like the Energy Multiplier Module (EM2) and the 50 MWe Fast Modular Reactor (FMR).
Research priorities focus on improving fuels, materials, and thermal hydraulics to advance GFR development, contributing to more efficient and sustainable nuclear energy technologies.
Matt Moore
The Generation IV International Forum – Gas-Cooled Fast Reactor (GFR)
The Generation IV International Forum – Technology Systems
