The following data are provided to allow potential users of HFIR to perform analyses that will improve quality assurance and speed the review process prior to performing irradiation experiments.
- In-vessel experimenters can find additional useful information here: https://neutrons.ornl.gov/hfir/working-with-us.
- Reference representative reactor physics model may be found here: https://www.sciencedirect.com/science/article/pii/S0029549320302466
- Low-Enriched Uranium Fuel Conversion Efforts at the High Flux Isotope Reactor may be found here: https://www.osti.gov/biblio/2234366
- Standardized Analysis for Licensing Evaluations (SCALE) Model users should visit the site: https://www.ornl.gov/scale.
- Reference for the HFIR Cycle 400 MCNP model: https://www.osti.gov/biblio/1185903
HFIR Operating Status
As of 17:08:02 09/27/2026 reactor power is 85 MW
The reactor is operating at 100% power for fuel cycle 517B.
Shutdown for operating cycle 517B is projected to occur on October 5, 2026.
OPERATING SCHEDULE
Forecast & Planning Schedule (PDF)
HFIR & SNS 5-Year Working Schedule
INFORMATION
Performing Experiments at HFIR
HFIR: Celebrating 60 Years of Big Science
HFIR: Real-World Impacts & Innovation
HOW HFIR WORKS
HFIR IN 1 MINUTE