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BASES
REQUIRED
ACTION C. 1
(continued)
The establishing of a fire watch in the AFFECTED AREAS does not provide
lll-time fire detection and alarm capability. A fire could initiate and propagate
between tours of the fire watch. Because the fire watch does not monitor all areas
continuously and, therefore, does not completely replace the lire detection and
alarm capability of the Flow Alarm Transmittal Systems, a reduction in he
initiating event or propagation frequency is warranted. REQUIRED ACTION C.2
is identified to reduce the likelihood of fire initiation in the Office Area.
REQUIRED ACTION C.3 is identified to reduce the likelihood of fire initiation in
the other AFFECTED AREAS.
While the fire watch does not provide the full-time fire detection and alarm
capability afforded by an OPERABLE Flow Alarm Transmittal System, the fire
watch individual has the capability to detect fires well in advance of the actuation
of the Automatic Sprinkler System. This earlier fire detection capability partially
offsets the noncontinuous coverage of the fire watch.
The four-hour COMPLETION TIME for determining and establishing a fire watch
in accordance with Site requirements provides adequate time for facility
management to assign the appropriate personnel, particularly on back shifts and
weekends. Occupants of the facility can perform the fire watch function. The
four-hour COMPLETION TIME does not result in undue risk due to the low
initiation fi-equency of a fire. However, the REQUIRED ACTION to establish a
fire watch in accordance with Site requirements is expected to be implemented as
soon as reasonably achievable, even if this is significantly less than the assigned
COMPLETION TIME. The four-hour COMPLETION TIME should not be used
for opemtional convenience.
REQulRED LCO 3.1 will not be met if the FIow Alaxm Transmittal System is not
ACTION C.2 OPERABLE for Riser System A which covers the Office Area. The absence of
the fire detection and alarm function in the BUILDING 991 COMPLEX Office
Area reduces the likelihood that the Fire Department will be notified that a fire
and/or actuation of the Automatic Sprinkler System has occurred. The Fire
Department serves a DEFENSE-IN-DEPTH protection findon in mitigating fires
in the hilily. The Fire Department also serves to mitigate hility flooding and
water damage due to actuation of the Automatic Sprinkler System. Without the
fire detection and alarm function, the likelihood of Fire Department response is
decreased. The loss of this DEFENSE-IN-DEPTH mitigation function tends to
slightly increase the likelihood of large fires. The facity is still protected if the
likelihood of fire initiation is decreased to offset the slightly increased likelihood
of large fires.
Revision 1
September 1999
A-35 Building 99 1 Complex FSAR
Appendix A