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DOE-HDBK-1132-99
Space and equipment should be provided as needed to support
accountability, process monitoring, and material control
requirements.
Exhaust prefilters and HEPA filters should be installed to facilitate
filter replacement and repair.
Standby filters should be incorporated for backup protection
during filter changes so that filters can be changed without
shutting down the exhaust fans. Standby filters should be
installed outside the cell and sealed in an acceptable enclosure
for direct maintenance.
Exhaust systems should have alarms that will annunciate if the
concentration of radioactive material in the exhaust exceeds the
limits specified in the facility technical safety requirement.
Secondary Confinement System . The secondary confinement system usually
consists of the facility operating compartments and associated ventilation
systems. The secondary confinement houses the hot cells, gloveboxes, fume
hoods, etc. The following design features should be incorporated into
secondary confinement systems for laboratory facilities:
design features to minimize the potential of the spread of contamination
from within the laboratory facility operating areas to areas that are not
normally contaminated;
the use of a ventilation system separate from the primary confinement
ventilation system with appropriate air-cleaning capability (e.g., HEPA
filtration, radioiodine absorbers, scrubbers); and
I-38


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