Question to the Department for Energy Security & Net Zero:

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.

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 reprocessing facility ceased reprocessing operations in 2022.