Hunterston B: Permission for limited operation

22 April 2021

The UK Office for Nuclear Regulation (ONR) gave EDF with permission for reactors 3 and 4 at the Hunterston NPP to return to service for a limited period of operation. Permission for the restart follows extensive scrutiny of EDF’s safety case by ONR specialist inspectors, Operation is permitted for up to a total of 16.7 terawatt days for reactor 3 and 16.52 terawatt days for reactor 4 – approximately six month’s operation for each. This will be the final period of operation before the NPP moves to the defueling phase.

 “Through assessment of EDF’s safety justification, which takes into account the expected ageing of the graphite core, our inspectors are satisfied that sufficient safety margins and defence in depth measure remain in place to ensure the safety of Hunterston B’s workers, of local residents and the wider public,” said ONR. “We are satisfied that reactors 3 and 4 at Hunterston B are safe to operate for the specified periods above, and that they can be safely shutdown (including in a significant seismic event) if required.

Photo: Tony Page