I just came across this UK/US Security Classification Equivalency list as used by the Los Alamos National Laboratory.
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UK - USA Classification Equivalency Table
UK Classification = USA Classification
UK In-Confidence OUO or Private
U U
Non-Atomic Classifications:
UK Restricted Confidential NSI
UK Confidential Confidential NSI
UK Secret/Top Secret Secret/Top Secret NSI
Atomic Classifications:
UK Confidential Atomic Confidential RD/FRD
UK Secret Atomic Secret RD/FRD
UK Top Secret Atomic Top Secret RD/FRD
UK Secret Conifer Secret RD/FRD
UK Secret Atomic Artificer Secret RD/FRD
UK Secret Atomic Conifer Artificer Secret RD/FRD
UK Secret Atomic Principal Secret RD/FRD Sigma 1 & 2 or CNWDI
UK Secret Atomic Principal Artificer Secret RD/FRD Sigma 1 & 2 or CNWDI
UK Top Secret Atomic Top Secret RD/FRD
UK Top Secret Atomic Artificer Top Secret RD/FRD
UK Top Secret Atomic Conifer Artificer Top Secret RD/FRD
UK Top Secret Atomic Principal Top Secret RD/FRD Sigma 1 & 2 or CNWDI
UK Top Secret Atomic Principal Artificer Top Secret RD/FRD Sigma 1 & 2 CNWDI
CA CRD
SA (Atomic) SRD
SA-TSA Secret Top Secret RD
CTSA (Cosmic Top Secret Atomal) DOE Q (SRD) or DoD TS/CNWDI
UTAH DEFINITION is UK Confidential
UCSG Use Control Subgroup
THEOREM Info & Hardware is Secret Atomic Code Word definition is UK Confidential
Definitions
UK Top Secret - Information and material the unauthorized disclosure of which would cause EXCEPTIONALLY GRAVE DAMAGE to the nation (UK).
UK Secret - Information and material the unauthorized disclosure of which would cause SERIOUS DAMAGE to the interests of the nation (UK).
UK Confidential - Information and material the unauthorized disclosure of which would be PREJUDICIAL to the interests of the nation (UK).
UK Restricted - Information and material the unauthorized disclosure of which would be UNDESIRABLE in the interests of the nation (UK)
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Supplementary Categories of Classified Information
Atomic
Atomic information is information classified Confidential or above, which reveals either directly or indirectly information about:
The design and fabrication of nuclear warhead.
Certain features of the design and fabrication of inertial confinement fusion, including laser fusion systems.
The costs and production rate of stockpile or nuclear warheads.
Certain features concerning the production, handling and stockpile of fissile, fusionable and special materials used in nuclear weapons.
Certain features of the design of naval nuclear propulsion plants.
The production rate of naval nuclear propulsion plants.
Certain other topics and categories of nuclear information as defined in the joint US/UK Nuclear Weapons Classification Guide and in other guides
issued by the Ministry of Defense and the Tripartite Declassification Guide and Classification Working Party guides issued by the UK Atomic Energy
Authority.
Atomic Conifer
Atomic Conifer is UK Secret or UK Top Secret information concerning details (quantities) of fissile, fusionable or special materials and certain
general information on design of warheads.
Atomic Principal
Atomic Principal is UK Secret or UK Top Secret information the theory of operation and the internal design of a nuclear warhead and its unique
components.(Equivalent to US Weapon Data Information.)
Atomic Artificer
Atomic Artificer is UK Secret or UK Top Secret information concerning hardness of Polaris/Trident systems.
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