All support facilities that have a potential for periodic low-level contamination
should be located in the controlled area. These facilities include change rooms and
decontamination rooms for personnel; health physics laboratories; facilities for the
receipt, temporary storage, and shipment of radioactive and potentially
contaminated materials; maintenance rooms for regulated equipment; mechanical
equipment rooms; and other laboratory facilities.
Air locks between controlled and uncontrolled areas should be used to provide
confinement of the controlled area if an inadvertent release of radioactive materials
or a fire occurs. Air locks should also be provided in controlled areas where there is
a potential for radioactive contamination to be spread from an area of high
contamination to one of lower contamination.
Where possible, each controlled area should have a single access and exit point for
personnel during normal operation. Access points should be accessible through
change rooms. Other access and exit points should be available as required for
emergencies and in compliance with the NFPA Life Safety Code (most current
version) (NFPA, 1985).
Space for step-off pads and radiation monitoring and survey equipment should be
provided at the exit from controlled areas that are potentially contaminated and
between high- and low-level contamination areas. The space provided should be
sized to accommodate the expected work force.
Change rooms should be available for both men and women, with
lockers to support the anticipated number of workers and support
personnel. Change rooms should include facilities for storing and
dispensing clean protective clothing, a well-defined ventilated area near
the exit from the controlled area for the temporary storage of potentially
contaminated clothing, and adequate shower facilities. The clean side of
the change room should be easily separable from the potentially
contaminated side of the room.
Space for step-off pads and radiation-monitoring survey equipment
should be provided for personnel and equipment leaving the controlled
portion of the change room.
Liquid wastes from potentially contaminated showers should be routed to
the liquid radioactive waste system or to a holding tank that may be
sampled before the waste is released.
The ventilation system should be designed to prevent the spread of
contamination from the controlled to the uncontrolled portion of the