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Confinement Devices cont'd - doe-std-1128-98_ch10309
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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Controlled Area - doe-std-1128-98_ch10311


DOE-STD-1128-98
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 sometimes required. When using organics in the
glove box, care must be exercised in the selection of the material to
minimize alpha radiation deterioration.
Fire protection should be provided in the glove box, enclosure, and
conveyor systems to meet DOE improved-risk objectives. Automatic fire
suppression should be provided in all new structures over 5000 square
feet and in all structures having a maximum possible fire loss (MPFL) in
excess of $1 million or where the maximum credible fire will result in
the loss of use of a vital structure for a period longer than that specified
as acceptable by the applicable PSO [DOE Order 420.1a, Facility Safety
(DOE, 2002a)]. When the MPFL exceeds $50 million, a redundant fire-
protection system should be provided that, despite the failure of the
primary fire-protection system, will limit the loss to $50 million.
Discrete workstations within an enclosure should be separated from each
other by fire stops to prevent the spread of fire. Fire stops should be
designed to be normally closed. For systems in which fire stops must
normally be open, closure should be automatic upon actuation of the fire-
sensing system. Instead of a fire-sensing system, an oxygen-deficient
atmosphere may be provided as the normal or required operating
atmosphere within the enclosure. Where automatic fire-suppression
systems are not required, a fire-detection system should be installed.
Provisions should also be made for manual fire suppression where it is
deemed necessary.
The actual sources inside the glove box should be shielded, if possible,
instead of shielding the glove box. However, the glove box should be
equipped with or capable of accepting any necessary neutron and/or
gamma shielding.
C-19


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