silo 3 - U.S. Department of Energy

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Process Description for the Silo 3 Project
Document No. 40430-RP-0003, Rev. 1
Jacobs Project No. 35H 19605
September 5, 2003
During Phase 2 operations, ventilation air for Silo 3 enters the silo from the Excavator
Room (see Section 4.3.3) and is exhausted to the PVS. Exhaust ports are located on the
VWEs and are connected to the Silo 3 PVS exhaust duct. Manual dampers control the flow
of air from Silo 3.
Each VWE consists of a short open-top enclosure on top of the manway riser, with supply
air and PVS suction hoses attached on opposite sides. The top of each enclosure has a
flexible boot that expands from the diameter of the wand to the diameter of the manway
to seal the wand to the manway. The boot has a zippered opening at the end of the wand
to allow the wand's hose fitting to be inserted through the boot when adding additional
wand sections.
4.3.2 Excavator Room Register (EAR-1 1-5053)
The Excavator Room Register is located near the top of the silo wall opening and is
connected to the PVS. The register is used to limit contamination transfer by capturing
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both saw cuttings and Silo 3 dust generated during silo-wall cutting (see A&RS, Section
5.2). The register can be used to transfer most of the exhaust air associated with pressure
boundary management in the Excavator Room. A manual damper controls air flow from I
the Excavator Room Register.
4.3.3 Retrieval Bin (HBN-11-5054) and Retrieval Bin Discharge Feeder (FDR-11-5106)
Air swept across the Retrieval Bin is captured by the Retrieval Bin Register (EAR-1 1-5052), I
which exhausts the air to the PVS. The register is operated during MRS activities. A
manual damper controls air flow from the Retrieval Bin Register. EAR-1 1-5052 is operated
independently of EAR-1 1-5053 (see Section 2.2.3). -. .
4.3.4 Inclined Conveyor (DFC-11-50561
The inclined Conveyor is contained in an enclosure that is exhausted to the PVS through
rigid connections on both the top (head section) and the bottom (tail section) of the
enclosure. Air withdrawn from the upper exhaust port serves to maintain a slight negative
pressure on the downstream conveyors. In addition, air withdrawn from the upper and
lower exhaust ports maintains both dust suppression and a pressure boundary within the
Inclined Conveyor enclosure. Manual dampers control air flow from the conveyor.
4.3.5 Container Management System
Sweep air associated with the two Package Loading Stands is captured by Package
Station Exhaust Registers A&B (EAR-25-5290A&B) (see Section 3.3). The locations of the
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registers allow the sweep air across the packaging fill heads to migrate away from
Operations personnel. Air displaced by bag filling and air evacuated during bag deaeration
is exhausted into the individual PVS exhaust piping for the Package Loading Stands. Fail- I
closed automatic dampers are located on the exhaust lines from each Packaging Station
Exhaust Register.
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