The security of the UK’s civil nuclear sector is of paramount importance to the Government. The Nuclear Industry Malicious Capability Planning Assumptions (NIMCA) provide a common basis for determining the sector’s required protective security posture. It is reviewed by DECC, the Office for Nuclear Regulation (ONR), and industry representatives on an annual basis. To ensure that the NIMCA assumptions remain appropriate, these annual reviews are supplemented with assessments of threat information provided by the police and the intelligence agencies on an ongoing basis. Additionally, the ONR maintains a permanent presence within the Joint Terrorism Analysis Centre, which guarantees the fastest possible identification and notification of intelligence that might indicate changes to present and foreseeable threats to civil nuclear sites.