Firefighters working at the Sellafield nuclear site in west Cumbria will go on strike for 12 hours tomorrow, Monday 22 January.
The GMB Union announced the industrial action today, Sunday 21 January.
Firefighters will walk out between 6am and 6pm.
The union says independent professionals have recommended a pay rise for firefighters, and that they act as paramedics when needed to.
The dispute began in the summer of 2017, and talks between the union and Sellafield management have been ongoing.