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Confinement Devices cont'd - doe-std-1128-98_ch10308
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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Confinement Devices cont'd - doe-std-1128-98_ch10310


DOE-STD-1128-98
Vacuum systems connected to a glove-box should be designed to prevent
an evacuation and possible implosion of the glove box.
Any gas-supply system connected directly to a glove box should be
designed to prevent pressurization, flow in excess of the exhaust
capacity, and backflow.
Flammable or combustible gases should not be used in glove boxes but,
if required, should be supplied from the smallest practical size of
cylinders. Flammable gas piped to a plutonium processing building
should not enter the building at a pressure exceeding 6-in. water.
Vacuum pump exhaust should be filtered and exhausted to the glove box
or other acceptable exhaust system.
If process water is provided to a glove box and the water must be valved
on when the box is unattended, a system should be installed to
automatically close a block valve in the water-supply line if a buildup of
water is detected on the box floor or in the box sump.
Process piping to and from glove boxes should be equipped with
backflow prevention devices and should be of welded stainless steel
construction. Vacuum breaker-type devices are generally more reliable
than other types.
Glove-box components, including windows, gloves, and sealants, should
be of materials that resist deterioration by chemicals and radiation.
Glove ports should be designed to allow for the replacement of gloves
while maintaining control of radioactive material. The ports should be
located to facilitate both operating and maintenance work. The need for
two-handed operation, depth of reach, mechanical strength, and
positioning with respect to other ports should be considered in the
design. Covers or plugs should be provided for each port. The covers or
plugs should provide shielding equivalent to the glove-box walls.
Automatic glove-changing systems should be considered.
Bag-out ports, sphincter seals, and air locks should be designed and
installed to facilitate the introduction and removal of equipment and
supplies without compromising contamination control. Air-lock gaskets
at the bottom rim should be protected from any physical damage
potentially incurred by removing items. Air locks should be designed to
be at negative pressure with respect to the workstation and positive
pressure with respect to the glove box.
Windows should be constructed of noncombustible or fire-resistant
materials that resist scratching, breaking, and radiation degradation. Wire
glass should be considered except where precluded by requirements for
visual acuity. In those instances, tempered or safety glass may be
suitable. Windows should be kept as small as possible while still meeting
visual requirements. A push-in window design should be considered for
C-18


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