Unclassified Controlled Nuclear Information

DoD and DOE may designate certain information as Unclassified Controlled Nuclear Information (UCNI). Such information relates to the production, processing, or use of nuclear material; nuclear facility design information; and security plans and measures for the physical protection of nuclear materials. This designation is used when disclosure could affect public health and safety or national security by enabling illegal production or diversion of nuclear materials or weapons. Access to UCNI is restricted to those who have a need to know. Procedures are specified for marking and safeguarding UCNI.