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DOE-STD-1128-98
Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities
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 ease of replacement. Use of PVDF lining or
laminations on windows may reduce their degradation and increase the ease of their
decontamination. The windows should be securely fastened and gasketed or
sealed. The gasketing material should be resistant to degradation by radiation or
other materials to which it will be exposed. Lighting fixtures should be mounted
on the glove-box exterior to the extent practicable.
Generally, organic (plastic) materials are not recommended for use in plutonium
glove boxes. However, when dealing with process streams containing large
quantities of fluorides or chloride ions, organic (plastic) pipe and equipment are
C-17


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