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OPAL operating cycles

Reactor schedule - 2023 to 2025*


  • Click on a cycle number to view the power and shutdown days for each operating cycle in the calendar below.
  • Click on the ‘previous’ and ‘next’ for more operating cycles.

*This schedule is subject to revision. 

Calendar updated 5 July 2023

Typical operating cycles

OPAL typically operates in cycles of 30 to 35 days, followed by a short refuelling outage to remove three spent fuel assemblies and replace them with new fuel assemblies.

During these types of outages, the OPAL team also performs maintenance and undertakes a series of inspections and surveillances. These refuelling outages typically last around four to six days.

The Reactor Operations team aims to operate OPAL for 300 days each calendar year.

Extended maintenance

In addition, there are longer maintenance outages that enable more extensive inspections, refurbishment and maintenance work to be carried out. These maintenance outages vary in length, depending on the work required, but are generally between one and four weeks in length. They would normally also include refuelling the reactor.

Scientific users

For users of OPAL's neutron scattering instruments, a day of beam time runs for 24 hours; for example from 9 am to 9 am the following day. 

The current beam users' schedule can be found on the Australian Centre for Neutron Scattering's online customer portal.