It is one of six organisations in the framework but one of only three to have secured a contract for both solid and wet wastes and it now enables the selected companies to bid for specific projects under the Magnox ILW Management Programme (MIMP).
Babcock secured a similar deal in February.
The work involves the retrieval and processing of both wet and solid intermediate level radioactive waste (ILW) across all the Magnox sites in the UK and the joint venture's scope of services includes design, construction, commissioning and operation of facilities that retrieve and package ILW, together with the de-contamination of associated facilities.
The partners have previously worked together as an integrated team on a variety of environmental clean-up services at Trawsfynydd in Wales.
Jacobs executive vice president Gary Mandel said: "This latest contract award shows the strength of the alliance that we have developed with Amec and Costain over the last five years. Together, we are well prepared to transfer the positive experience of the Trawsfynydd program to these additional Magnox projects around the UK."
Mike Saunders, president of Amec's Power & Process Europe business, added: “This is a significant award. It calls for the specialist skills and experience that the members of the joint venture possess and it is vital that we deliver a world class service for the customer.”