Workers at West Cumbria’s Sellafield site are set to strike over pay for another two weeks.
Members of the Unite union, who work for sub-contractors at the nuclear complex, began industrial action in September.
They are demanding site-specific allowances, which they claim are paid at other nuclear sites, from their companies.
The union has confirmed to Cumbria police that members will take industrial action from Monday, December 8.
The industrial action is covered by conditions from Cumbria police under the Public Order Act.
Marches must not start before 7am and conclude by 10am.
Any marches from Calder Bridge to North Gate must start after the turn-off to Sella Park Hotel so that their business access can be maintained.
Previously, marches had been taking up to six hours as striking workers walked really slowly – dubbed the Sellafield shuffle.
The union has also confirmed to police that another week of action is planned from December 15.
Sellafield Ltd is not involved in the dispute.
A spokesman added: “The industrial action taking place at Sellafield is the result of a pay dispute between some Unite union members and their employers.
“As the people involved are not employed by Sellafield Ltd this is not a dispute that we can resolve.
“Our priority, as always, is to maintain the safety and security of the Sellafield site.
“We have provided guidance to our employees who may be impacted in travelling to the site during the action.
“We will also continue to support Cumbria police as they work to minimise the impact of the action on the local road network.”
Unite said the companies involved in the dispute were Altrad Services; Amentum Clean Energy; Amentum Enterprise Asset Solutions; AVRS Systems; Balfour Beatty; Careys; DSD; Design Grid; Enigma; Erith; ES Steel Ltd; Flannery; Impwood; Kaefer; Keltbray; Kier; LEL Nuclear; Mammoet; Meldrum; Mitie FM Ltd; Mitie Ltd; Morgan Sindall; NG Bailey; NRL; Nuvia; PC Richardson; PPS Electrical; Rhodar; Shepley; Sir Robert McAlpine; VGC Group; William King; G&M Lawson Ltd; Athena; Stobbarts Ltd and FB Taylor (Cable Contractors) Ltd.
