Radiological Training for Accelerator Facilities
Accelerator Facility Access Modes (Facility Specific)
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
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.
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).