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Technical characteristics

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High-Flux Reactor

Description of the ILL HFR (High-Flux Reactor)

Neutrons at the ILL are delivered by its reactor.

Refurbished between 1993 and 1995, it produces the most intense continuous neutron flux in the world in the moderator region: 1.5x1015 neutrons per second per cm2, with a thermal power of 58.3 MW.

The reactor operates continuously for a 50 day cycle, followed by a shutdown to change the fuel element. In addition, there is a longer shutdown to enable necessary maintenance work to be carried out. Normally there are 4 cycles a year, providing 200 days for science.