The four-way ACTUS joint venture will be responsible handling intermediate level waste at the Trawsfynydd site in North Wales.

Dave Wilson, Trawsfynydd’s site director, said: “This is a significant award and one which will help Magnox deliver the site into early care and maintenance – in line with our optimised decommissioning plan.”

Darren James, Costain managing director, Infrastructure Division, said: “This is just the start of the next series of challenges similar to those the team has already successfully navigated at Trawsfynydd.”

“ACTUS understands the bar is now raised even higher and there will be no complacency in the pursuit of the client’s goals our work will help achieve.”

Clive White, Vice President of AMEC’s Nuclear Business, said: “This is a significant milestone and cements the JV at the forefront of one of the key areas of focus for Magnox in the UK decommissioning programme.”