Doosan Babcock, which has contracts on West Cumbria’s Sellafield site, has been taken over.
The Altrad Group, which also has offices based at the nuclear complex, announced that the deal had been finalised.
It will see Altrad take on around 4,000 workers from Doosan Babcock, which will be renamed Altrad Babcock.
Group co-chief executive, Ran Oren, said: “We have admired the Doosan Babcock business from a distance for many years and I am pleased we have been able to finalise this latest acquisition, which will add a wide range of value-adding engineering skills to the Altrad Group.
“We are committed to investing in the business to support its continued growth, so together, we can play our part in supporting the transition towards a more sustainable future.”
Altrad’s UK, Ireland and Nordics chief executive, Padraig Somers, added: “We are delighted to welcome Doosan Babcock into the Altrad family. The acquisition represents an exciting opportunity to extend our portfolio of services and enter new markets, whilst enhancing the outcomes we deliver for our clients.”