Written Question·Department for Energy Security and Net Zero·UIN 88152

Plutonium

Tabled: 4 November 2025

Answered: 17 November 2025

Question

Helen Maguire

To ask the Secretary of State for Energy Security and Net Zero, what quantity of plutonium was added to the civil plutonium stockpile in the last year.

Answer

Michael Shanks

The UK is no longer adding to the inventory of separated civil plutonium through reprocessing spent fuel. The Thermal Oxide Reprocessing Plant (THORP) at Sellafield is now closed, having ceased reprocessing operations in November 2018 and the Magnox repro...

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