Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what quantities of unprocessed plutonium remain within discharged irradiated spent nuclear fuel at (a) nuclear reactor sites and (b) Sellafield.

Plutonium is a by-product of nuclear fission, and it is present in small quantities in spent irradiated fuel. However, the quantities would vary based on the fuel and reactor type.

The Office for Nuclear Regulation publishes annual figures on estimated amounts of plutonium contained in spent civil reactor fuel in the UK. The most recently published data can be found at the following link: 2023 annual figures for holdings of civil unirradiated plutonium | Office for Nuclear Regulation