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Document No. 40430-RP-0003, Rev. 1
Jacobs Project No. 35H19605
September 5, 2003
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0 D&;c;\ned for compliance with building code standards for wind, snow, and seismic
loads;
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Compatible with standard door, ventilation, and lighting systems; and
Sufficient height to allow operation of the VWEs at all candidate manways.
Air is drawn into the enclosure through six combination louver/backdraft dampers.
Because the VWEs provide localized negative-pressure containment, exhaust air from the
Silo Enclosure is not HEPA-filtered but is exhausted directly to the atmosphere by the Silo
Enclosure Exhaust Fan (FAN-77-5780). There are no provisions for heating the Silo
Enclosure.
Cargo Container Bay
The Cargo Container Bay is ventilated by a dedicated air-handling unit with roughing filters
(AHU-77-5737). Exhaust air is directed to the atmosphere by three roof-mounted exhaust
fans (FAN-77-5790 A, B, and C). Radiant heaters (HTR-77-5740 A, B, and C) are provided
in the Cargo Container Bay's work areas for spot heating in the vicinity of the Off-Loading
Conveyors.
Trailer
The combined Operations Support/Change Room Trailer is heated and cooled by two
independent HVAC units, which can be roof-, wall-, or pad-mounted. One unit heats and
cools the Control Room, while the second unit handles the balance of the trailer. The
entire trailer is maintained under positive pressure, with the Control Room having the
higher pressure.
Both HVAC units include intake HEPA filtration and are designed to maintain room
temperatures between 68 and 8OOF.
Electrical Building
The Electrical Building is ventilated by drawing air through two combination
louver/backdraft dampers via a wall exhaust fan (FAN-77-5795). Two electric unit heaters
(HTR-77-5796A & 5796B) with unit-mounted thermostats maintain the building at a
minimum of 55°F.
CEM Building
Because of the sensitivity of its instrumentation, the CEM Building is heated and cooled by
an independent HVAC unit. The unit is designed to maintain a constant room temperature
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Wastewater Tank Area and Storage Area
The Wastewater Tank Area (006) and the Storage Area (005) are adjacent and, as shown
in Table 6-1, neither area is occupied or on the cascade system. Air is drawn into both I
areas through two combination louver/backdraft dampers with roughing filters. Exhaust air
from the two areas is directed to the atmosphere by the Storage and Wastewater Tank
Area Exhaust Fan (FAN-77-5792). Three unit heaters (HTR-77-5797Ar B, and C) provide
freeze protection for the area's four tanks, four pumps, and associated piping.
6-3
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