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and the Room 110 exhaust fans be ~ermanentl~ disconnected to ureclude anv potential
disniution in the existing flow paths. These recommendations have been incorporated along
with installation of two additional differential uressure gapes with the Room 170 differential
pressure page. The second differential Dressure m e is bein? installed to measure differential
pressure between the inlet Dortion of the plenum and an atmosuheric reference. Ths
measurement provides an indication that a main plenum exhaust fan is runninp. A third
differential uressure ?age is being installed to measure the differential uressure across the
Building 99 1 ventilation svstem exhaust Dlenum. This measurement provides an indication that
the plenum sinple stage of ffEPA filtration is unblocked.
Certain faciliw configurations have been identified that do not vield desirable negative
pressure in Room 147 and 170. This situation results when (1) the Room 170 dock doors are
ouened (assumed to result in insufficient negative pressure even with the expected inflow of air):
and (2) the Room 170 doors to Rooms 149. 140/141. and 134 are all closed (Room 170 isolated
from Building 99 1 exhaust ventilation svstem).
In conclusion, as lono as the DroDer facility confiwration is maintained. it is expected
that all waste storage areas of the facilitv will be exhausted bv the Buildin? 991 roof plenum
with the exception of Room 166.
2.3.2.3 WAC Heating System
.All the Building 991 Complex heating systems are supplied from natural gas fueled
boilers located east of Room 166 of Building 99 1. The natural gas fueled boilers have replaced
the steam system that previously supplied heat to the building. This change was necessary since
. the underground section of the steam system had developed leaks over the years and has
deteriorated. Complete failure of the steam system would have left the Building 991 Complex
without any heating capacity.
Two Rite Model 300LNx weatherproof, inclined water tube forced draft boilerhumer
units are located approximately 15 feet east of Room 166. The boiler construction consists of
the boilers, the burners, the control panel, and the gas train. The boilers are constructed to meet
the American Society of Mechanical Engineers (ASME) Boiler Code No. IV for 125 psi W.W.P
UL/CSD-l/FM Code. They are custom designed for outside operation. The boiler construction
consists of 2 inch outside diameter inclined boiler tubes rolled and flared into 5/8 inch thick tube
sheet. These boiler tubes are ASME rated at 125 psi. The outside body of the boiler is insulated
18 gauge, galvanized metal jacket with an enamel paint fmish. The boiler has a built in
combustion chamber with 2,75OoF high temperature castable refractory and 3 inches of
insulation. The boilers are approved to handle 2,500 cubic feet (fc')/hour supplied natural gas.
The normal operating pressure of the boilers is 30 psi and the boilers have an ASME pressure
relief valve that is set at 45 psi. Included as part of the boilers is a McDonnell-Miller TC-4 low
water cutoff With test and check valve and a McDonnell-Miller #63 auxiliary low water cutoff
with manual reset. A Honeywell high limit safety control with manual reset is also installed.
Building 99 1 Complex FSAR
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