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system contains an untested HEPA stage on the roof where the exhaust fan is located.
Building 998 is exhausted by exhaust system E-18.
Buildings 996, 997 and 999 and Corridors B and C are exhausted by the Building 985
filter plenum. This system also draws some air from the north side of Building 991. If th~s
system is inoperable, it is expected that air from these buildings and conidors would be
exhausted by the Building 991 plenum exhaust fans. The door located in Corridor B would
probably have to be left open to obtain an adequate flow from the buildings.
Room 134 has no dedicated filtration system. Depending on the configuration of the
building (e.g., roll-up doors between Rooms 170 and 134 and Rooms 170 and 140/141 left open;
supply system S-1 in Room 130 door left open; installation of fire doors between the office area
and Room 134, etc.) air may either exhaust into or out of the room. Possible exhaust paths for
the air in Room 134 are through an exhaust duct located in Room 132 (exhaust system E-4) and
one located in Room 135 (probably exhaust system E-20). The airlock doors in the north-south
running hallway have been removed. which ensures a dedicated flow path for Room 134 into the
north portion of the buildinp no matter the conficzuration of the roll-up doors. Therefore. air in
Room 134 is expected to be exhausted by the Building 991 exhaust filtration svstem.
Room 170, the west dock, has no dedicated filtration system. Good air flow was noted
from Room 170 into Rooms 140/141 through the fire doors. The future modification plans of
the building include installing a fire-rated roll-up door between these rooms with smoke
detectors. The plan is to keep this door normally open but this cannot be guaranteed. If the door
remains open, and if the Building 991 roof plenum exhaust fans are operating, air from
Room 170 could be exhausted through the north building exhaust ducts. If the door is closed,
either intentionally or because the heat detectors automatically close the door, and if other flow
paths to the north Dodon of the building are blocked, the air probably will not be exhausted
through a HEPA fitration system.
Room 166 has no dedicated filtration system. Air in this room does not exhaust through
a HEPA fitration system.
The office area, Rooms 101 through 129, have no dedicated filtration systems except for
the exhaust fan for the women’s bathroom and locker room. This exhaust system feeds the
Building 991 roof plenum exhaust system. An exhaust system (E-8) is located in Room 101 but
the system is not operational. This exhaust system also feeds the Building 991 roof plenum
exhaust system. During the summer months, operation of the return air fan does fhction LO
exhaust portions of the office area. This system exhausts directly to the atmosphere. Two other
exhaust systems are located in Room 110. These systems, when operational, exhaust directly to
the atmosphere.
An engheerk evaluation (Ref. 26) concluded that the south waste stora9e areas
[Rooms 134, 147 and 170) should be considered HEPA filtered and that Room 166 should be
considered an unfiltered area. This evaluation recommended that a permanent differexxi a1
pressure gage be located in Room 170 to measure the differential Dressure in this room with
resDect to an atmosoheric reference. The evaluation aiso recornmended that exhaust t7nn E-11
Revision 1 2-44
Scotemher 1999
Building 99 1 Complex FSAR
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