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Confinement Ventilation Systems cont'd - hdbk1132990036


DOE-HDBK-1132-99
center should be considered. The inlet should have a temperature
sensor with a readout on the facility control center monitor screen.
Where spaces, such as a control room, are to be occupied during
abnormal events, filtration systems on the air inlets should be considered
to protect the occupants. Control rooms should also be protected from
the entry of smoke or other toxic gases through ventilation air intakes.
Compressed (bottled) air storage could be used to pressurize the control
room if toxic gases are present at the air intake. Alternatively, two
intakes, separately located, could lessen the likelihood of toxic gas
intake.
Either HEPA filtration or fail-safe backflow prevention for process area
intake ventilation systems should be provided.
Consideration should be given to specify cadmium-free HEPA filters to
avoid generating mixed waste.
Roughing filters or prefilters upstream of a HEPA filter should be
considered to maximize the useful life of the HEPA filter and to reduce
radioactive waste volume.
When ducts with fire dampers penetrate the secondary confinement,
boots may be needed for the clearance between the structure and the
damper sleeve.
Hot cell exhaust systems considerations are as follows:
Exhaust prefilters and HEPA filters should be installed to facilitate filter
replacement and repair. Use of a bag-in/out type filter house can lessen
personnel exposures.
Standby filters should be considered to provide backup protection and
facilitate primary filter replacement without shutting down the exhaust
I-19


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