Passive engineered controls

DOE-HDBK-1108-97

Radiological Training for Accelerator Facilities

Student's Guide

Once installed, passive engineered controls require no further action to perform their

intended function. Passive engineered controls may include:

Radiation shielding such as concrete blocks, iron plates, lead bricks and earth berms;

and

Barriers such as fences, locked gates, and doors.

Active engineered controls

Active engineered controls include devices that sense changing conditions and can trigger

a safety action. Personnel are prevented from accessing beamline areas when the

accelerator is operated. All access points are protected by doors or gates that are both

locked and interlocked. The interlock sensors will turn off the beam in the event a door

is opened.

Safety interlock devices include:

Area radiation monitors.

Access gate sensors.

"Crash" or "scram" buttons.

Administrative Controls

Administrative controls include programs and procedures that personnel must implement to

provide protection from hazards.