silo 3 - U.S. Department of Energy

Process Description tor the Silo 3 Yroject
Document No. 40430-RP-0003, Rev. 1
Jacobs Project NO. 35H19605
September 5, 2003
When the silo wall is first breached (see A&RS, Section 5.2), PRS operation may
continue'. During this intermediate stage, airflow patterns will change due to the
establishment of a new air pathway into the silo. Supply air provided to the Excavator
Room by the HVAC system will be exhausted by both the PVS and the PRS.
When the PRS is no longer effective in retrieving material, the MRS (see Section 2.2) will
begin to recover material from the silo. Mechanical retrieval will be performed using a
remotely controlled excavator deployed from the Excavator Room. This recovery phase,
during which the PRS is not operating, is called "Phase 2". Supply air provided to the
Excavator Room by the HVAC system will be exhausted only by the PVS. Flows
associated with Phase 2 are described in the Material Balance Table and in Figure 4-2.
During startup, balancing activities will be performed to establish appropriate damper
positions for all phases of operation.
4.2 PROCESS VENT SYSTEM EQUIPMENT
The PVS comprises the following equipment:
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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
4.3 PROCESS VENT SYSTEM SOURCES
The total design airflow for the PVS is approximately 5,500 scfm. Air from the following
sources is transferred to the PVS:
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Silo 3 and VWEs A-F (ENC-10-5020A-F)
Excavator Room Register (EAR-1 1-5053)
Retrieval Bin Register (EAR-I 1-5052) (for HBN-11-5054 and FDR-11-5106)
Inclined Conveyor (DFC-11-5056)
Packaging Station Exhaust Registers A&B (EAR-25-5290A&B)
The remainder of this section describes each of these sources in detail.
4.3.1 Silo 3 and VWEs (ENC-10-5020A-F)
Ventilation air from Silo 3 is exhausted to the PVS during mechanical retrieval (Phase 2);
VWE maintenance, manipulation, and extension activities during Phase 1 ; and I
nonoperational periods (Le., evenings, weekends, and other system downtimes).
*Material recovery by the PRS will be performed either from the silo dome using vacuum wands or 1
from within the silo using the Excavator equipped with an end effector for pneumatic retrieval.
4-3
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