The Department of Energy recently approved a comprehensive manual on procedures for protecting all manner of classified or controlled information in the Department’s possession.
From RD (Restricted Data) and FRD (Formerly Restricted Data) to SAPs (Special Access Programs) and SPECATs (Special Category programs), it’s all in there. (Or almost all. A complete roster of all of the “sigma” categories of nuclear information is not included.)
The manual has not been readily available online, but a copy was obtained was obtained by Secrecy News and posted on the Federation of American Scientists web site.
See “Information Security,” DOE Manual 470.4-4, approved August 26, 2005 (2 MB PDF file).