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Low-Quality Secondary Containment Systems cont'd
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Design Considerations - index
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Tertiary Containment Systems cont'd - hdbk1132990137


DOE-HDBK-1132-99
Tertiary Containment Systems . In most tritium facilities, the term "ertiary
t
containment"is something of a misnomer. It usually refers to an ultra-
conservative approach where a high-quality primary system is housed in an
intermediate-quality secondary containment system, such as a glovebox, which
is equipped with a cleanup system. Both of these are then housed in a low-
quality containment system, such as a room, which is independently connected
to a cleanup system. In most cases, the cleanup system associated with both
the glovebox and the room are the same cleanup system.
In theory, the purpose of tertiary containment systems is to prevent the
immediate release of tritium to the environment in the event of a catastrophic
(and simultaneous) failure of both the primary and secondary containment
systems. In practice, however, these systems have never been used and, in
fact, they probably should not be used in an automatic mode in the event of a
catastrophic (and simultaneous) failure of both the primary and secondary
containment systems. Under such circumstances, the primary emphasis
should be on the health and safety of the worker, and potential rescue efforts
should not be hindered by shutting down the ventilation system to those parts
of the building where it is needed the most. After appropriate first-aid and
rescue efforts have been completed, consideration might then be given to the
use of these types of systems in a manual mode. But, as was noted in the
previous section, the use of such systems can be expected to have its own
undesirable effects, and the actual use of such systems could make a bad
situation even worse.
Tritium Removal Systems. In most tritium facilities, secondary containment
2.10.9
systems are connected to, or equipped with, tritium removal systems. The
primary purpose of these removal systems is to recover any tritium that has
been released from its associated primary containment system and to prevent
the release of that tritium to the environment. Like the secondary containment
systems they are connected to, the operational aspects of individual tritium
removal systems vary greatly among facilities, and among different types of
containment systems in any single tritium facility.
I-120


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