Strike action is continuing at the Sellafield site this week.
Members of the Unite union, who work for sub-contractors at the nuclear complex, are taking industrial action over demanding site-specific allowances, which they claim are paid at other nuclear sites.
The union has confirmed to Cumbria police that members will also take industrial action from next 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.
Previously, marches had been taking up to six hours as striking workers walked really slowly – dubbed the Sellafield shuffle.
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.
Sellafield Ltd said: “We expect disruption when accessing the Sellafield site during the period of industrial action.
“Therefore, wherever practicable and feasible, managers should enable teams to undertake their normal work from a different location, including an off-site office or from home.
“This will help to protect availability of critical resources and to mitigate traffic disruption and impact on our local community.
“Please car share or use the bus/train where possible – not only when accessing site, but for travel to off-site offices which we expect will be busier than usual.”
Earlier this month, the union also said in a statement on social media that it was calling on employers to return to the table with credible solutions that recognise the unique hazards and skills required at Sellafield.
Cumbria Crack asked, on October 15, when the union last had face-to-face negotiations with the contract firms it was in dispute with.
Sellafield Ltd said it was 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.
