It is an important milestone in the immobilisation of the historic liquid waste, known as raffinate, created from reprocessing undertaken during the operation of Dounreay’s three reactors.
The achievement comes just days after Dounreay announced that all of the reactor’s liquid metal coolant had been destroyed.
Dounreay’s Waste Director, Bruce Covert, welcomed the news: “Encapsulation of 232 cubic metres of DFR raffinate is a significant achievement for the whole site, with the material grouted and suitable for long term storage in 875 drums.
“This is a good example of everyone at Dounreay working together as one team to safely deliver one programme, ensuring the project remained on schedule with minimal interruptions.”
Nigel Lowe, NDA Head of Programme for Dounreay and Magnox, said: “This is a great milestone in a long line of Dounreay milestones. The team should be very proud of this achievement.”
Batches of liquor were remotely transferred from underground tanks to a cementation plant. Here it was neutralised and mixed with cement powder inside 500-litre drums in a remote handling facility, making it passively safe for long-term storage or disposal.
The cementation plant will now undergo some engineering modifications and enhancements before the workforce begin to immobilise the Prototype Fast Reactor (PFR) raffinate.