Sellafield firefighters are staging a walkout today in a dispute over pay and working conditions.
The 12.5 hour walkout by 63 GMB members got under way at 6am this morning and will continue until 6.30pm this evening.
Today's strike is the first of two 12.5 walkouts, with further industrial action scheduled for Thursday from 6am to 6.30pm.
Firefighters were due to strike on 24 July, but more time was given to management to put in place a promised resolution to the dispute by the end of September.
GMB reports a resolution was not put in place.
Crews at Sellafield work to keep more than 10,000 workers on site safe, along with the surrounding communities.
Chris Jukes is the Senior Organiser of GMB:
Sellafield management say they're focussed on ensuring the safety of the nuclear site during industrial action: