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Confinement Ventilation Systems cont'd - hdbk1132990033
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Confinement Ventilation Systems cont'd - hdbk1132990035


DOE-HDBK-1132-99
sampling probe as possible. Guidance for air cleaning device test port
locations is provided by ASME N510, Testing of Nuclear Air-Treatment
Systems.
The number of air filtration stages required for any area of a facility
should be determined based on the quantity and type of radioactive
materials to be confined.
Air filtration units should be installed as close as practical to the source
of contaminants to minimize the contamination of ventilation system
ductwork.
Ducts should be sized for the transport velocities needed to convey
particulate contaminants to filter media while minimizing the settling of
those contaminants in the ducts.
Ducts should be welded (transverse or longitudinal). Connections to
equipment should be made using companion angle flanges.
Air filtration units should be located and provided with appropriate
radiation shielding to maintain occupational doses ALARA during
operations and maintenance.
Air filtration units should be designed to facilitate recovery of fissile
material and other materials capable of sustaining a chain reaction .
The cleanup system should have installed test and measuring devices
(see ASME N510) and should facilitate monitoring operations,
maintenance, and periodic inspection and testing during equipment
operation or shutdown, as appropriate.
Misters to cool inlet air and demisters to prevent soaking HEPA filters
should be installed. Manual control of misters from the facility control
I-18


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