are combustible-- rubber gloves, plastic bags, polyvinyl chloride (PVC)
pipes, etc. Thus, the glovebox is vulnerable to involvement in fire, which,
in turn, could cause the loss of glovebox integrity.
Facility design should provide for the continuous monitoring of external
radiation exposure levels in process areas (e.g., hot cells and canyons)
during maintenance or repair operations. Neutron shields in the form of
water jackets should be capable of being monitored for water loss.
Gloveboxes should be equipped with quick couplings for dry chemical-
Recovery of Scrap/Residue . Plutonium scrap and residue should be
recovered, processed, and accounted for-- to the extent practical-- according to
the special nuclear material (SNM) accounting requirements. To prevent the
accumulation of plutonium-containing scrap or residue, space should be provided
for expeditious treatment or processing of these materials to allow their return to
the main process.
Plutonium could be recovered using various methods, depending on the
chemical process employed. For the aqueous process, plutonium could be
recovered by means of leaching and dissolution, followed by purification,
evaporation, and concentration. For pyrochemistry, the recovery process would
include salt flux remelting, hydriding, oxidation, and/or anion exchange.
The following features should be considered to address the recovery and
handling of scrap and residue:
Equipment for recovery and handling of scrap/residue should be
designed to minimize dusting and physical losses or spillage. Vessels
used for solution treatment, assay, or storage should be of geometrically
safe design to preclude accidental nuclear criticality.