Accelerator Facility Access Modes (Facility Specific)

DOE-HDBK-1108-97

Radiological Training for Accelerator Facilities

Student's Guide

EO-12 DESCRIBE each access mode at the site.

Accelerators have several possible states or modes regarding accessibility. Each facility may use

different terminology but the following modes are nearly universal.

Normal or open access mode

Beam area is not interlocked and beam cannot operate. Access to these areas is

unrestricted after a radiation survey to identify and isolate areas of activation of

Search & secure mode

Operators physically search beam area to ensure no personnel are present and to lock

access gates. Personnel must immediately leave area by the path designated by the

search party.

Controlled access mode

Beam area has been searched and secured and remains interlocked; however, beam

cannot operate. Limited personnel access is allowed. There is no search of area

following the access.

Test mode

Certain devices, (e.g. magnets) may be energized to allow testing. Beam production

components with equipment are locked out so beam cannot operate. Limited personnel

may access but must be aware of hazardous conditions, (e.g., electrical power).

Exclusion mode