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Secondary Confinement System - hdbk1132990051


DOE-HDBK-1132-99
Generally, UCRFs have used two confinement systems. The primary
confinement system encloses or confines the uranium materials being
processed and the materials used to process the uranium. The secondary
confinement consists of the structures and associated ventilation systems that
surround the operating areas that house the primary confinement system. The
operating areas include those areas that are not normally expected to become
contaminated. The secondary confinement system barriers are those that
separate the outside environment and free access areas, such as offices and
lunch rooms, from potential contamination. The actual confinement system
requirements for a specific UCRF should be determined on a case-by-case
basis.
Primary Confinement System. The primary confinement system consists of
barriers, enclosures (including their associated ventilation or atmosphere control
systems), process piping and vessels, and so forth. Its principal function is to
prevent the release of hazardous substances into the operating areas. The
following considerations should be addressed in the design of primary
confinement systems for UCRFs:
Breaches of the primary confinement barrier (e.g., due to glove or seal
failure) are acceptable if the off-gas treatment system is capable of
maintaining an adequate inflow of air for the specified breach size and
location. Some portions of the primary confinement may not form a
complete physical enclosure. For these, primary confinement function
should be ensured by adequate airflow and appropriate process
equipment design.
If needed, conveyors should be used to interconnect gloveboxes or other
primary confinement enclosures to minimize introduction and removal of
materials from the system. The primary confinement system criteria
should be applied to these interconnections.
Special design features should be considered to safely introduce and
remove materials from process confinements.
I-34


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