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{{Short description, Category of U.S. top secret classified data Critical Nuclear Weapon Design Information (CNWDI, often pronounced ''SIN-widdy'' or ''SIN-wuh-dee'') is a
U.S. Department of Defense The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national secur ...
(DoD) category of Top Secret Restricted Data or Secret Restricted Data that reveals the theory of operation or
design A design is a plan or specification for the construction of an object or system or for the implementation of an activity or process or the result of that plan or specification in the form of a prototype, product, or process. The verb ''to design'' ...
of the components of a thermonuclear or fission bomb, warhead, demolition munition, or test device. Specifically excluded is information concerning arming, fuzing, and firing systems; limited life components; and total contained quantities of fissionable, fusionable, and high explosive materials by type. Among these excluded items are the components that DoD personnel set, maintain, operate, test or replace. The sensitivity of DoD CNWDI is such that access is granted to the absolute minimum number of employees who require it for the accomplishment of assigned responsibilities on a classified contract. Because of the importance of such information, special requirements have been established for its control.


Markings

In addition to other required markings, CNWDI material should be clearly marked, "Critical Nuclear Weapon Design Information-DoD Directive 5210.2 Applies." As a minimum, CNWDI documents shall show such markings on the cover or first page. Portions of documents that contain CNWDI shall be marked with an (N) or (CNWDI) following the classification of the portion. For example, TS(RD)(N) or TS(RD)(CNWDI).


Weapon Data

That portion of
Restricted Data Restricted Data (RD) is a category of proscribed information, per National Industrial Security Program Operating Manual (NISPOM). Specifically, it is defined by the Atomic Energy Act of 1954 as: :''all data concerning (1) design, manufacture, or u ...
or
Formerly Restricted Data Restricted Data (RD) is a category of proscribed information, per National Industrial Security Program Operating Manual (NISPOM). Specifically, it is defined by the Atomic Energy Act of 1954 as: :''all data concerning (1) design, manufacture, or u ...
that concerns the design, manufacture, or utilization (including theory, development, storage, characteristics, performance, and effects) of atomic weapons or atomic weapon components and nuclear explosive devices is called Weapon Data and it has special protection provisions. Weapon Data is divided into eight Sigma categories the protection of which is prescribed by DOE Order 5610.2, CONTROL OF WEAPON DATA. However, certain Weapon Data has been re-categorized as CNWDI.


See also

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Q clearance Q clearance or Q access authorization is the U.S. Department of Energy (DOE) security clearance required to access Top Secret Restricted Data, Formerly Restricted Data, and National Security Information, as well as Secret Restricted Data. Restri ...


Sources


National Industrial Security Program Operating Manual (NISPOM)
Feb 2006 edition United States government secrecy Classified information in the United States Nuclear secrecy Nuclear weapon design