silo 3 - U.S. Department of Energy

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Process Control Plan for the Silo 3 Project
Document No. 40430-PL-0003, Rev. 1
. Jacobs Project Number 35H19605
September 6, 2003.
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4.0 PROCESS VENT SYSTEM (SYSTEM 19)
The following PFD and P&IDs illustrate the Process Vent System (PVS):
94X-3900-F-0143 1 F0003 Process Vent and Packaging Systems
94X-3900-N-01439 NO106 Process Vent System, Sheet 1 of 2
94X-3900-N-01440 NO107 Process Vent System, Sheet 2 of 2
The PVS is a collection and filtration system for process vent streams from the Silo 3
Project. These streams are associated with retrieval and packaging of Silo 3 material and
are potentially contaminated with radon and particulates. The major process areas being
vented are located on Silo 3 (via the VWEs), the Excavator Room, and the Packaging Area.
Streams collected by the PVS pass through baghouse dust collectors and HEPA/ULPA filter
housings, and are then routed to the Exhaust Stack, where they are sampled and
discharged to the atmosphere.
FQr a description of how the PVS interacts with the PRS, MRS, and HVAC systems, see
Section 2.0.
4.1 PVS EQUIPMENT
Major equipment in the W S
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is as follows:
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DCL-19-5202A&B: Process Vent Dust Collectors A&B
HBN-19-5205A&B: Fines Collection Bins A&B
FLT-19-5204A&B: Process HEPA Filters A&B
FAN-1 9-5206A&B: Process Exhaust Fans A&B
STK-19-5209: Exhaust Stack
0 CEM-19-5208: Continuous Emissions Monitor (CEM) (Radon, Particulate, and Flow
Monitoring)
For ’detailed descriptions of all equipment associated with the PVS, see the PD,
Section 4.4.
4.2 PVS INSTRUMENTATION
Table 4-1 summarizes, by function, all of the instrumentation in the PVS.
4.3 PVS CONTROL PHILOSOPHY
The PVS is designed to:
Remove radon and particulate-laden air from the various system components and filter
the particulate decay products prior to discharge.
Reduce radon and particulate concentrations in processing areas.
Detect and measure radon and particulate releases to the atmosphere.
Contaminated gases and dust are drawn through the PVS by redundant centrifugal fans
(FAN-1 9-5206A&B). The fans and associated ductwork are designed to maintain
appropriatevacuum levels in Silo 3, the Excavator Room, the Excavator Service Room, and
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