The Nuclear Decommissioning Authority (NDA) will take over the running of Sellafield from Friday, April 1, in a non-commercially driven contract.
The new arrangement sees Sellafield Ltd, the company responsible for clean up operations at the nuclear site, become a subsidiary of the NDA, the public body responsible for the safe and efficient clean-up of the UK's nuclear programme.
The change will allow Sellafield Ltd to progress its hazard and risk reduction and decommissioning, in order to deliver it more efficiently.
Sellafield Ltd has been owned by private sector consortium Nuclear Management Partners (NMP) since 2008.