Nuclear decommissioning workers are to be balloted on a new pensions deal aimed at ending a long-running dispute.
Members of Unite at the Nuclear Decommissioning Authority will vote in the next few weeks on whether to accept the proposed agreement.
Unite said an improved offer had been made, although it will involve an increase in contributions, while many of the established benefits will remain unchanged.
National officer Kevin Coyne said: “After more than a year of intensive negotiations, we believe that on the pension issue, this is the best deal that can be achieved by negotiation.
“A significant achievement was to roll back the £620 million savings demanded by the Treasury to a more manageable figure of £320 million.”
Unite has nearly 3,000 members working at the NDA, including Sellafield.