closure project manager - Document Request - U.S. Department of ...

BASES
REO UIRED
ACTIONB 1
The Building 985 exhaust ventilation svstem filt~~ti~~i capabilitv is o~ih necrssan'
ifthe system is being used. Tlic 5uildine 985 exhaust ventilation system erovides
an additional exhaust path from the facih bevond that resdtiiia from operatiori
of the Building 991 exhaust ventilation svscem. If the Bidding 985 Automatic
Plznum Deluve Svsteni is not OPERABLE. the facilits. shall stop opzration of the
Building 985 exhaust ventilatioii svsteni main exhaust fats within hio hours
Terminatiori ofthe f$n use will rierrate the need for a system to Drotcct die HEPA
filtration in the Buildinn 985 FEW since the additional exhaust ~ath from the
facilitv provided bv the Buildin2 985 FEVS vi31 no longer exix Simificant
aniounts of fire generated heat and particulates will not be dmwn into a ventilation
svstem that is not onerating. This is an alternative REOUIRED ACTIOK to
termination of hot w70rk and restoration of the safetv function.
The two-hour COMPLE-TIOX TIME associated ttith stoDDinP the Building 985
exhaust fans provides adeauate time for facilie management to contact the
appropriate workers to uerform the task. The REOUIRED ACTION to stop the
Buildiua985 fans is expected to be implemented as soon as reasonabh
achievable. even if this is sionificantlv less dim the assigned COMPLETION
TIME. The two-hour COMPLETION "ME should not be used for operatronal
convenience.
REOUDRED LCO 3.3 will not be met if the Automatic fhum Delune System is not
ACTION B2.1 OPEReLE in the Building 985 FEVS pleniii. "lie absence of the deluge
svstem fimctioii in the Building 985 FEVS D~CZWII provides the potential for a
large faciliw fire to impact the Buildine: 985 FEVS filters if the FEVS is beins
used. The Automatic Plenum Dzlugt System functions to cool the air enterinr! the
plenum andor to suppress hot embers and flviing brands from imitine the HEP.4
filters. Without die deluge function, the iikelihood of 1arc.e fires in the %ciIin
irnnactinn the filters in the denum is increased. The E3ciliw is still protected if
the likelihood of fire initiation is decreased sufficiznth to offset the increased
likelihood of lame fires impactinn the HEPA filters.
Revision 1
Scpkmher 1999
Ethe Automatic Plenum Deluge Svstem is not OPEK4BLE. the facilitv stid1
temunate all hot work being conducted in the AFFECTED AREAS nitflin
nvo-hoim. The termination of hot work (ie. sDark;hear/flame producing work) IS
a measure to reduce the likelihood of fire initiarion in the facilitt-. The terminawn
does not dace the filter protection function of the Automatic Plenum Deluge
Svsteni but attemDts to maintain an equivalent risk bv reducing fire freauenc\
The termination of hot work does not Dreclude fire initiation. Energized cle~tnal
systems in die facifitv always have the potential to initiatr: fires. Therefor:,
REOUIRED ACTION B.3.2 is identified to expedite the restoration of ri;:
Automatic Plenum De1ug;c' System
A-70 Building 99 I Complex FSAR 1
Appendixri i