Plutonium Disposition Strategy

Friday 24th January 2025 Written Statements

[The Parliamentary Under-Secretary of State for Energy Security and Net Zero (Michael Shanks)]

The Department for Energy Security and Net Zero will work with the Nuclear Decommissioning Authority to immobilise the UK-owned civil separated plutonium inventory at Sellafield.

Continued, indefinite, long-term storage leaves a burden of security risks and proliferation sensitivities for future generations to manage. It is the Government’s objective to put this material beyond reach, into a form that both reduces the long-term safety and security burden during storage and ensures it is suitable for disposal in a geological disposal facility. Implementing a long-term solution for plutonium is essential to dealing with the UK’s nuclear legacy and leaving the environment safer for future generations.

Following a public consultation in 2011, the Government at the time formed a preliminary policy view to pursue reuse of plutonium as mixed oxide fuel but to remain open to any alternative proposals for plutonium management.

The NDA has since carried out substantial technical, deliverability and economic analysis to identify a preferred option for a long-term disposition solution, including options for immobilisation and reuse. The outcome of this work recommended immobilisation as the preferred way forward to put the material beyond reach soonest and with greatest delivery confidence.

Following further development work the NDA will select a preferred technology for immobilisation of the plutonium as a product suitable for long-term storage and subsequently disposal in a GDF. Organisations involved in the delivery of this work will include the NDA—in particular Sellafield Ltd and Nuclear Waste Services—the UK National Nuclear Laboratory and the wider supply chain.

We expect that around the end of the decade, following Government approval, the NDA and Sellafield will begin delivery of the major build programme of plutonium disposition infrastructure. This programme is expected to support thousands of skilled jobs during the multi-decade design, construction and operational period.

While work continues on long-term immobilisation, the NDA is ensuring the continued safe and secure storage of plutonium in the UK. As part of this approach, new facilities are being built at Sellafield to repack the plutonium inventory for placement in a suite of modern stores.

[HCWS388]