Workers at the Sellafield nuclear site are to stage a fresh strike in a dispute over pay.
Members of the GMB union will walk out for 24 hours from 6am on November 29 in a continued protest over an imposed 1.5% wage rise.
The union said 3,000 workers will be involved in the action – the second strike by GMB members since the row flared.
The GMB said it has given the company an assurance that minimum safety manning levels will be maintained throughout the strike and emergency arrangements will be in place.
Talks were held last week but they failed to break the deadlock.
Chris Jukes, GMB senior organiser, said: “Our members do not want to strike again but Sellafield seem incapable of delivering what is discussed in talks.
“What is not clear is if this is deliberate tactics to drag out the dispute or just a lack of competence on the part of some of the negotiators.
“GMB members are seeking a decent pay increase that makes up for some of the ground they have lost over recent years, when pay rises have failed as a whole to keep up with inflation.”
The Unite union is also in dispute with Sellafield over pay.