Development of bagless transfer system for standard waste boxes Page: 4 of 12
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Place Figure 7 here
At the "ENTRANCE" side of the ceiling opening, when the first
clean SWB is to be slid in place to accept contaminated waste, a
second new SWB is mated up with the trailing edge of the entering
SWB. Between the two SWB's will be placed a removable formed foam
"ENTRANCE" seal, (see Figure 6) As the entering SWB is slid in
place, the formed seal will be slightly compressed to fit under
the "ENTRANCE" side of the ceiling opening. At that time, all
four sides of the Modified SWB will be completely sealed and
filling the SWB will begin.
During the sliding process of the SWB's, contamination is
contained and controlled at the "ENTRANCE" and the "EXIT" side of
the opening. At the "ENTRANCE" seal, during sliding a new SWB in
place, the basement atmospheric pressure will be higher than that
inside the Transuranic Waste Facility, (see Figure 8) This
differential pressure insures that when a new SWB is slid in
place, the minimum clean air flow rate of 200 ft/min flows
through the clean SWB into the contaminated TWF building. At the
"EXIT" seal, the SWB lid is positioned so that as a contaminated,
full SWB slides out from under the "EXIT" seal, the foam breaks
loose from the ceiling surface and continues to adhere to the SWB
surfaces, there by maintaining the foam seal in contact with the
underneath of the lid. Once the full SWB is positioned under the
lid, the lid is permanently attached to the SWB and the SWB is
now ready for shipment to the WIPP Project.
Place Figure 8 here
As the replacing modified SWB is slid in place, the formed foam
"ENTRANCE" seal between the SWB's will be forced off of the SWB
surface with the shear blade. The formed foam "ENTRANCE" will
fall back into the replacing modified SWB. This will insure that
no contaminated services will come in contact with the open
basement atmosphere, (see Figure 9)
Place Figure 9 here
The secondary barrier will be an enclosure of the basement
portion of the process. This enclosure will contain contamination
should any seal failure occur. The modified SWB's and personnel
will enter and exit the enclosure through air locks.
SPECIAL ASPECTS
One goal was to minimize or eliminate maintenance of moving
parts/systems in the contaminated TWF. Therefore all equipment
associated with the system are accessible in the clean basement.
During a transfer, should a loss of power occur, a manual
override will be designed so that the transfer can be completed
to prevent contamination "creep". In addition, a bank of
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Presgrove, S.B. & Patel, K. (Bechtel Savannah River, Inc., North Augusta, SC (United States)). Development of bagless transfer system for standard waste boxes, article, January 1, 1991; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1093664/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.