Engineering services company Costain has been awarded a £297m contract by Sellafield for full engineering, procurement, construction and inactive commissioning of the Evaporator D nuclear project in the UK.

Costain has developed and defined the design of the facilities that will be used to expand Sellafield’s ability to process nuclear waste material and reduce inventories at the site, the company said.

The project is scheduled for completion in 2014.

The housed evaporator building will consist of 15 in-cell modules, over 22km of pipe work bound together by over 10,000 welds, 300t of specialist steel and 400 major plant items.

The contract is an extension of an original purchase order awarded in September 2006 for Front End Engineering Design.