The Jules Horowitz Reactor (JHR) will be a 100 MWth light water MTR optimised for fuel and material testing. In summary, the capabilities of the JHR will include the following:

- Fuel testing under nominal, off-normal and accident (eg loss of coolant accident) conditions
- Material testing under high dpa and controlled thermal gradients
- Pressure vessel steel testing
- Corrosion and stress corrosion cracking testing
- High temperature materials testing
- Gen II, III, III+ and IV fuel and material types
- Supply of medical isotopes