Question to the Ministry of Defence:

To ask the Secretary of State for Defence, how many reportable nuclear security incidents at defence sites he was notified of in the financial years (a) 2013-14 and (b) 2014-15; and for each of these years, how many incidents were classified as (i) major, (ii) moderate, (iii) minor and (iv) of no significance according to the categorisation used by the Office for Nuclear Regulation.

There were no incidents of unauthorised access to nuclear weapons and material. Defence Ministers were notified of four security incidents in 2013-14 and three security incidents in 2014-15 at defence nuclear sites. The Office for Nuclear Regulation security categorisation does not apply to defence.