The project has been awarded by the Programme and Project Partnership – a four-way joint venture between Kellogg Brown and Root, Jacobs, Morgan Sindall and Doosan Babcock.
This partnership was appointed last year to revolutionise project delivery at Sellafield.
Kier is constructing the seismically designed reinforced concrete structure which will act as an annex to an existing facility.
Works will include the formwork, reinforcement and concreting, together with the installation of lattice girder roof trusses.
The majority of the works are scheduled to finish in autumn 2023.
Mark Pengelly, group managing director at Kier Infrastructure, said: “We’re pleased to have been appointed to this project, which we have been awarded on the basis of our proven delivery capability in the nuclear environment.”
Kier has an extensive history of delivering projects at Sellafield and since 1981 it has completed in excess of 70 projects valued at £350m.