Sealine Pipe Bridge, Sellafield
We undertook the complete refurbishment of the site’s 60-year-old Sealine Pipe Bridge. Work on the 10-span bridge included replacement of the concrete pier supports and installation of a new truss over the railway line below. Working with our client’s permanent design team we developed the construction sequence along with the temporary support systems and access scaffolds.
Magnox Encapsulation Plant (EP2), Sellafield
The EP2 complex comprised a number of structures including a process building, services building, cement silo and grout washing building, all designed and constructed for the encapsulation of intermediate level waste.
The process building featues heavily reinforced concrete walls with cast-in penetrations and embedments. The services building is constructed of a structural steel frame with suspended concrete floors and houses changing rooms, plant room and the main distribution centre for the building service utilities.
THORP Receipt and Storage Ponds, Sellafield
Sir Robert McAlpine constructed two ponds for the underwater storage of spent nuclear fuel, prior to reprocessing. The ponds are 100m long, 27m wide, 10m deep and have a capacity of 18,000,000 litres.
A sophisticated drainage system lies between each pond and its raft foundation, comprising two layers of no fines concrete separated by a flexible membrane. A steel plate positioned beneath the lower layer provides a secondary containment.