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Secondary Confinement cont'd
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Design Considerations - index
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Confinement Ventilation Systems cont'd - hdbk1132990033


DOE-HDBK-1132-99
The use of stack-vented rupture disks, seal pots, or bubbler traps should
be considered to prevent overpressurization and potential explosive
disruption of the secondary confinement system.
When a pipe is used as the primary confinement barrier for materials,
and the pipe exits a secondary confinement, the secondary confinement
should be provided by a double-walled pipe of other encasement. In
areas within the facility, the use of double-walled pipe should be
considered. Leakage monitoring should be provided to detect leakage
into the space between the primary pipe and the secondary confinement
barrier. (See Resource Conservation and Recovery Act requirements in
40 Code of Federal Regulations (CFR) 264.193, Containment and
Detection of Releases, and 40 CFR 265.193, Containment and
Detection of Releases.)
When primary confinement includes ductwork, the considerations in the
previous bullet should be applied to the ductwork. Transition from
primary to secondary confinement typically occurs downstream of air
cleaning devices, such as high-efficiency particulate air (HEPA) filters
and adsorbers.
Tertiary Confinement. Tertiary confinement is provided by the building or outer
1.1.5
structure of the facility. For some accidents, it represents the final barrier to
release of hazardous material to the environment; for others, it is a barrier that
protects other parts of the facility from damage.
ALARA concepts should be incorporated in tertiary confinement system design
to minimize exposure to operators, the public, and the environment.
1.1.6
Confinement Ventilation Systems. The design of a confinement ventilation
system ensures the desired airflow at all times and specifically when personnel
access doors or hatches are open. When necessary, air locks or enclosed
I-16


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