To ask the Secretary of State for Defence how many used fuel cores from naval reactors are stored at (a) the Naval Reactor Test Establishment at Dounreay, (b) Devonport Dockyard, (c) Rosyth Dockyard and (d) Sellafield. (206529)

I am withholding the information as its release would, or would be likely to, prejudice national security. Ultimately, all used fuel cores will be stored at Sellafield.