The Nuclear Industries Malicious Capabilities (Planning) Assumptions is a protectively marked document produced by the Director of Civil Nuclear Security (DCNS) for use by the operators of civil licensed nuclear sites, approved carriers of nuclear material and other authorised persons. The purpose of the document is to set out the attributes and characteristics of those posing a threat to nuclear premises and to nuclear material so that an appropriate level of security can be put in place to protect against such malicious capabilities. This is a sensitive planning document underpinning security throughout the UK’s civil nuclear industry and DCNS advises that it cannot be released, even in a redacted form, without significant risk to national security.