Corporate report: Nuclear Decommissioning Authority: Annual Report and Accounts 2025 to 2026

Our Annual Report and Accounts 2025 to 2026 highlights the progress the NDA group has made in reducing hazards and decommissioning the UK’s civil nuclear sites.

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This report sets out continued mission progress, from decommissioning the NDA’s existing sites, with safety, security and value for the taxpayer a key consideration, to expanding our mission and being trusted to do more, while managing radioactive waste for our existing programme and new nuclear.

Significant progress has been made across the NDA group this year, against a backdrop of a challenging financial climate, including reducing hazards, delivering visible decommissioning progress and strengthening how we operate.

At Sellafield, teams continued to retrieve, treat and store waste from legacy ponds and silos, including 70 tonnes from the Magnox Swarf Storage Silo, reducing some of the estate’s most complex risks.

Sellafield also achieved a UK first by processing the first can of plutonium residue into a form suitable for disposal; an early milestone in a long-term programme to reduce risk for future generations.

Across the estate, progress from Nuclear Restoration Services (NRS) included the demolition of Sizewell A’s turbine hall and adjoining structures, clearing land for future use and setting new benchmarks for controlled demolition on a UK nuclear site.

Innovation continued to accelerate delivery and reduce risk, from autonomous waste sorting at Oldbury to robotic operations in an active Sellafield glovebox.

Nuclear Transport Solutions (NTS) and Nuclear Waste Services (NWS) continue to work in parallel to deliver the capping work at the Low Level Waste Repository, while NRS completed disposal of 192 containers of low-level radioactive waste at Dounreay. NTS is also developing transport capability for future HALEU use, including the Pegasus transport package with Westinghouse and interest from an international customer.