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BASES
APPLICA'TION
TO SAFETY
rzN At YSI s
('continued)
Thz FEVS is credited in combination with an AOL control to have the dock doors
closed during all operations conducted in Room 170 exuceut for rc'ceiving and
shiauiiig ooemions. It is intcnded that containers (otber than SKM Tvpc E
shiapinp conkiiners) will be immediatek swed in Room 170 at receipt until he
dock doors are closed. Follouine door closure. containers are moved to stowe
locations. Also. it is assumed that containers (other than SNM Tvpe B shiDpinq
containers) will be stared in Room 170 in preparation for shipping prior to thc
dock doors being opened for placement on the msport vehicle.
LCO 3.2 The RUlLDTNG 991 COMPLEX Filtered Exhaust Ventilation Svsteins Shall Be
OPERABLE.
For the FEVS to be OPEIIWBLE. the system must maintain a negative prcssurc in
the areas where container ouerations. other than receipt and shipment, ari:
conducted. A neeative pressure differential in the inlet portion of the
Building 991 plenum indicates that an FEVS fan is operating -4 negatrw
differential uressure across the Buildinp 991 ulenum indicates that KEPA filters
are Drovidina resistance to flow and are mesent If an FEVS h is operating and
the FEVS ductwork is relativelv intact, the north container scoraxe:'staqina areas
and the Bidding 996 connected area will be at a negative pressure relative to ;111
atniosDheric reference. The south waste container storage area nesahve
differential DESSUIZ must be verified indrmendentlv due to the FEW indirect
rather than direct, SUDDOT~ of the south waste container dome areas
For the FEVS to be OPERABLE. the svstem must also filter facilitsr exhaust air
if the Building 991 exhaust plenum filter m e efficiency has been verified. air
exitin,z the faciliW via the Building 991 FEVS is fil?cred. If the Building 985
FEVS is milized and one of the two exhaust olenimi filter stase efficiency has
been verified. air exiting the facilih- via the Building 9SS FNS is filtcred
APPLICABILITY This LCO is apulicable to those oortions of the BUILDING 991 COMPLEX.
other than Room 166, that are interior container stome/sm;ing mas
lie., Building 991 north and sot& container stome/staging maszs. Buildinn 948
{Room 300 and Comdor A). and Building 996 (Builditlo 996 arid Comdor B))
The LCO is amlicable & dl times.
Revision j,
Smtcm bcr 1999
DZikrential pressure requiirenients do iiot hax to be inaintained during normal
differential pressure fluctusions of less than 5minutrts in duration Wild
conditions outside the facilitv mal' lead to differential DrZssure fluctuations As
loria as tt:c fluc~3tions are of a short duration. there is no indication that the
svstern is iiot OPERABLE. Tne Room 170 pressure differential rtguAcnicnts cig
not havc to be maintained white dock doors m open durinv receipt and shipment
mentions. The safety analvs~s evalu3tzs accidents occurring while dock doors a-e
open as unfiltered releases
A-52 Building 991 Complex FSAR
Appendis .4