Magnox and its contractors Priory Construction, supported by Aurora, have successfully completed decommissioning of the Old Main Active Drain (OMAD) at Harwell. The project, which involved the removal of 4000 metres of drain and 95 manholes, was completed on time and 14% under budget, with no lost-time accidents or significant radiation exposure to workers. Some of the areas traversed by OMAD have been subsequently de-licensed, demonstrating that the project achieved a fully clean end state. The drain which originally transferred contaminated liquids to the Liquid Effluent Treatment Plant for storage and subsequent treatment had been filled with grout many years previously; in order to immobilise the residual radioactive contamination. The principal concern during the works was the number of live services in the ground above the drain that had to be protected. The project recovered over 2000 m3 of very low level radioactive waste, the majority of which has now been exported to its final destination.
Magnox 12th Aug 2016 read more »