silo 3 - U.S. Department of Energy

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Access and Retrieval Strategy for the Silo 3 Project
Document No. 40430-PL-0002, Rev. 1
September 2003
FDR-10-5102, Feed Conveyor, is a constant-speed screw conveyor, which receives
material from both the Pneumatic and Mechanical Retrieval Systems and transfers the
material to the project packaging system.
3.2 PNEUMATIC RETRIEVAL SYSTEM OPERATION
Initial retrieval efforts are pneumatic. Material is vacuumed out of the silo through selected
man ways on the dome. Retrieval operations will be performed from man way to man
way, with a limited amount of material removed for each man way retrieval event, in order
to achieve a near uniform removal of material from top to bottom. Pneumatic retrieval
continues from selected man ways until it is no longer effective or practical due to either
inaccessibility by the pneumatic wand or a reduction in flowability of the material. One of
the retrieval sites is the easternmost man way; material is removed from this point until
the east wall is clear enough to allow for wall-cutting activities.
Two or more operators will operate the VWMS on the silo dome. Their operations will be
guided by using the VWMS cameras and by communicating (by radio) with PRS operators
in the Process Building. The Process Building operators will control and monitor the PRS,
exclusive of the VWMS. An alarm on the silo dome will indicate that the Pneumatic
Retrieval Collector has a high material level and the VWMS operators will maneuver the
vacuum wand as necessary to reduce the rate of material retrieval. A high-high material
level will automatically stop the PRS blower. The Process Building PRS operators will
communicate with the packaging system operators, who have the primary control of the
material retrieval rate (i.e., material retrieval rate must be consistent with packaging rate
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@ capability).
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