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BASES
REOUIRED
ACTION A. I
[continued)
Revision L
September lcB9
~ ~
Upon loss of off-site Dower to the BIJILDIYG 451 COMPLEX. the Buildinrr 441
FEW exhaus? fans mav stou ntmiing mcl tile credited filtercd exhaust safcts
bction inw be lost Alternate electric Isower mat- be supdied bv a dicrzl
generator in Building 989. The diesel qencrator mat- keep the FE’\:S nmning and
mainrain the filtered exhaust safety fitnction. However. a diesd generator that is
not inaintained and tested per requirements in TSRs is considercd to have hiah
unavailabifiw (i.e.. failure to start) and unreli&ili@ (i.e.. failure to renmn
running). Therefore. the loss of oE-sitc Dower is considered to be equivalent EO a
failurz of the FEVS (i.e..no uower to the eshmst fans). The correspondinp
REOMRED ACTIOX associated with a loss of the safetv hction is auulied to
the situation where the BUZLDTKG 991 COMPLEX has lost a11 electric power or
is opeminz on alternate nower -suuulied bs the diesel generator
If die FEVS is not OPERABLE in die container stomelstaeina arm. the hcility
shall SUSPEND OPERATIONS in the AFFECTED AREAS within four hours
The SUSPEND OPERATIOXS REQUIRED ACTION is a measure to reduce the
likelihood of otxrational accidents in the AFFECTED AREAS. The suspension
of ouerations does not reolace the filtcred exhaust safetv hction of the Fm’S bot
attenmtts to mainrain an eciuit-dent risk bv reducing the likelihood of fire. spill.
puncture, and hydrogen exoiosion scenxios. The suspension of ooerations does
not Dreclude firs initiation. Energized efecuid svstems in the fxififx dwws
have the Dotentid to initiate fires. However- the likelihood of dect-ricd system
induced fires is considered to be simnificantlv less than fires initiated bv o~emtions
(e..~.. maintenance activities). paiticularlv in the situation where faCi1it.i- off-site
power is lost.
As discussed in the AuDticabilitv section above. movements of SNhl Twe B
sbuine; contiiners and POCs are not suspended. Also. movements of waste
containers froni a stwed location in Room 170 to a transport vehicle at the
Room I70 dock are not suspended.
The four-hour COMPLETION TIh4E associated with the SUSPEND
OPERATIOXS REWIRED ACTION Drovides adequate time for facilitv
rnanaecment to inform the workers of the required termination and for the workm
to safelv tenninate the work.
A-54 Building 991 Complex FSAR
Appendix A