Secondary Confinement

DOE-HDBK-1132-99

Gloves should be designed to allow replacement without losing

contamination control and with minimum exposure to the

operator.

When gloves are not in place, a noncombustible shield or cover

for each glove port should be provided.

Exhaust air filters to minimize contamination of ductwork.

Ease of cleaning (radius corners, smooth interior and exterior surfaces,

minimal protuberances, and accessibility of all parts).

Specific coatings for boxes containing halides to permit long life and

ease of decontamination.

Adequate interior illumination (from fixtures mounted on the exterior

where feasible).

Connections for service lines, conduits, instrument leads, drains, and

ductwork.

Pressure differential monitors and heat detection.

Fire barriers and filter installation.

Sample removal ports for filter testing.

Consideration should be given to incorporating transfer systems (such as

double-door, sealed transfer systems or chain conveyors) for removal of

hazardous material from a glovebox. Various types of removal and transfer

systems are discussed in International Atomic Energy Agency (IAEA) Safety

Series No. 30. These systems are designed to allow entry and removal of

material without breaching the integrity of the glovebox. (See ERDA 76-21,

Nuclear Air Cleaning Handbook, for additional information.)

1.1.4

Secondary Confinement. The secondary confinement system consists of

confinement barriers and associated ventilation systems that confine any

potential release of hazardous material from primary confinement. For example,

when gloveboxes provide primary confinement for radioactive or hazardous

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