INTRODUCTION
Access into certain limited security areas is controlled by an S-3 (Security Systems Group) access system that, in addition to reading all the data furnished to the BRASS system to determine access authorization, checks that the individual has been authorized to go into the specific building, area. etc. The host organization determines who is authorized and coordinates with S-3, who then enters the Z number of each authorized individual into the S-3 database. The Z number is a local (LANL only) identification number and is created through the Laboratory's Employee Information System (EIS).

Some cleared visitors to LANL come from other DOE sites and possess a valid DOE Standard badge issued by those sites. DOE requires that all DOE sites accept any valid DOE Standard badge for use at their site. These badges can be enrolled for use in accessing LANL limited security areas maintained by S-3 badge readers or hand readers. Normally, such visitors do not have a LANL Z number. If they are approved for unescorted access into an S-3 database controlled area, they must first have a Z number that can be entered into the database. At the time of badge enrollment, the LANL Badge Office must be able to provide the assigned Z number as part of the enrollment data sent to S-3. Visitors who possess a DOE Standard badge but not a LANL Z number may, once their badge is enrolled, pass freely through many of the access points based on their security clearance and access granted by the DOE. These visitors will not, however, be able to access any S-3 database controlled limited security area. If the controlling organization wishes to authorize access to its database-controlled limited security area, the procedure below must be followed.

OTHER INFORMATION
	The locations for S-3 database-controlled limited area systems are identified.
	Custodians/hosts should advise the visitors that a Z number is required in order to have access to database controlled limited security areas.
	Some visitors may have been previously assigned a Z number (a Z number is a permanent, lifetime-assigned number). In this case, it is only necessary to determine what the Z number is.
	The custodian must make the request via a signed request fax to S-3 who then enters the visitor's information into the S-3 data base prior to the visitor having unescorted access to the S-3 database controlled limited security area.