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Chemical Processing cont'd - hdbk1132990069
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Design Considerations - index
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Recovery of Scrap/Residue


DOE-HDBK-1132-99
The process and equipment supporting the pyrochemical processing of
plutonium should be designed to accommodate the pyrophoricity of plutonium
metal and other materials used in molten salt and molten metal processing,
button break-out, and the sampling operations. Features of the design should
consider the minimization of dusting from operations. A criticality-safe service
vacuum system may be used to clean up dusts.
In addition to the features described above, facilities for the chemical processing
of plutonium should address the following:
The process glovebox system should be designed to minimize moisture
pickup by process materials. An inert atmosphere should be considered
in gloveboxes where plutonium is processed. Bag-in/bag-out operations
should be conducted without compromising glovebox atmosphere
integrity.
The airborne radioactive effluents typically associated with PPHFs are
furnace off-gas, airborne dust, off-gas from solvent processes, and
corrosive vapor or mists from dissolvers. The design of airborne effluent
systems should consider and minimize plutonium holdup at locations in
off-gas and ventilation ductwork and include provisions to detect, monitor,
and recover the build-up of such material.
The capability to service equipment should be provided. Equipment
should be designed to minimize plutonium holdup. Provisions should be
made to remove process material from equipment and to measure
plutonium holdup with minimum downtime.
Because of the pyrophoric nature of plutonium metal, the plutonium
process/handling glovebox system should be designed to accommodate
glovebox fire safety. A leak detection system should be provided to
detect the inleakage of air, which could change the glovebox atmosphere
and lead to a plutonium fire. Certain glovebox construction components
I-54


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