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Primary Confinement System - hdbk1132990040
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Primary Confinement System - hdbk1132990042


DOE-HDBK-1132-99
The need for special ventilation systems for confinement purposes should be
based on results of the safety analysis. In general, each compartment should
be supplied with ventilation air from the building ventilation system. Each
compartment should also be provided with separate exhaust ventilation handled
by a system with sufficient capacity to provide adequate ventilation flow in the
event of a credible breach in the compartment confinement barrier. Pressure in
the compartments should be negative with respect to the building ventilation
system.
Tertiary Confinement System. The facility building and its ventilation system
comprise the tertiary confinement system. Penetrations of the building
confinement barriers should have positive seals to prevent the migration of
contamination. Air locks or enclosed vestibules should also be provided for
access through confinement barriers.
1.2.2
Unirradiated Enriched Uranium Storage Facilities. The following provisions
are typical for an unirradiated enriched uranium storage facility (UEUSF)
confinement system. The actual confinement system requirements for a
specific UEUSF should be determined on a case-by-case basis.
The degree of confinement required is generally based on the most restrictive
hazards anticipated. Therefore, the type, quantity, and form (physical and
chemical) of the materials to be stored should be considered. For materials in a
form not readily dispersible, a single confinement barrier may be sufficient.
However, for more readily dispersible materials, such as liquids and powders,
and for materials with inherent dispersal mechanisms, such as pressurized
cases and pyrophoric forms, multiple confinement barriers should be
considered.
Generally, for the most restrictive case anticipated, the use of three confinement
systems should be considered. The primary confinement should be the
unirradiated enriched uranium (UEU) cladding or the storage container (e.g.,
canning). Secondary confinement should be established by compartments with
I-25


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